[logging] add support for per-instance log levels (#12740)

This commit introduces the ability to set and manage log levels on a
per-instance basis when dynamic logging is enabled, while maintaining
backward compatibility with existing logging behaviors.

The existing `otLoggingGetLevel()` and `otLoggingSetLevel()` APIs are
repurposed to manage the "global" log level. They continue to behave
exactly as before in both single-instance and multi-instance
configurations, ensuring that existing users of these APIs do not need
to change their implementations. To provide more granular control, new
APIs `otGetLogLevel()` and `otSetLogLevel()` are added to handle
per-instance log levels.

Specifically, this commit makes the following changes:
- Adds `mLogLevel` to `Instance` to track the instance-specific log
  level.
- Renames the global log level static variable to `sGlobalLogLevel` and
  introduces `GetGlobalLogLevel()` and `SetGlobalLogLevel()` to manage
  it in a multi-instance configuration.
- Updates `otGetLogLevel()` and `otSetLogLevel()` APIs to handle
  per-instance log level retrieval and configuration. If a specific
  level is not set for an instance, it falls back to the global
  log level.
- Adds `mIsLogLevelSet` to distinguish between an explicitly set
  instance log level and the global fallback in multi-instance builds.
- Introduces `otPlatLogHandleLogLevelChanged()` platform callback to
  notify the platform when an instance-specific log level is updated.
- Updates Nexus tests to use `SetGlobalLogLevel()` instead of the
  deprecated instance `SetLogLevel()` method.

include/openthread/instance.h

@@ -52,7 +52,7 @@ extern "C" {
  *
  * @note This number versions both OpenThread platform and user APIs.
  */
-#define OPENTHREAD_API_VERSION (585)
+#define OPENTHREAD_API_VERSION (586)
 
 /**
  * @addtogroup api-instance

include/openthread/logging.h

@@ -39,6 +39,7 @@
 #include <stdint.h>
 
 #include <openthread/error.h>
+#include <openthread/instance.h>
 #include <openthread/platform/logging.h>
 #include <openthread/platform/toolchain.h>
 
@@ -56,23 +57,68 @@ extern "C" {
  */
 
 /**
- * Returns the current log level.
+ * Returns the current log level for a given OpenThread instance.
  *
  * If dynamic log level feature `OPENTHREAD_CONFIG_LOG_LEVEL_DYNAMIC_ENABLE` is enabled, this function returns the
- * currently set dynamic log level. Otherwise, this function returns the build-time configured log level.
+ * currently set dynamic log level:
+ * - In a single-instance configuration, it returns the instance's log level.
+ * - In a multi-instance configuration, it returns the instance-specific log level if it has been explicitly set
+ *   (see `otSetLogLevel()`). Otherwise, it returns the global log level (see `otLoggingGetLevel()`).
+ *
+ * If the dynamic log level feature is not enabled, this function returns the build-time configured log level.
+ *
+ * @param[in] aInstance  The OpenThread instance.
  *
  * @returns The log level.
  */
+otLogLevel otGetLogLevel(otInstance *aInstance);
+
+/**
+ * Sets the log level for a given OpenThread instance.
+ *
+ * @note This function requires `OPENTHREAD_CONFIG_LOG_LEVEL_DYNAMIC_ENABLE=1`.
+ *
+ * In a single-instance configuration, this function sets the log level for the instance.
+ *
+ * In a multi-instance configuration (`OPENTHREAD_CONFIG_MULTIPLE_INSTANCE_ENABLE`), if
+ * `OPENTHREAD_CONFIG_LOG_INSTANCE_AWARE_API_ENABLE` is not enabled, this function returns `OT_ERROR_NOT_CAPABLE`.
+ * When the log level is explicitly set on an instance, it overrides the global log level set using
+ * `otLoggingSetLevel()`.
+ *
+ * @param[in] aInstance  The OpenThread instance.
+ * @param[in] aLogLevel  The log level.
+ *
+ * @retval OT_ERROR_NONE          Successfully updated the log level.
+ * @retval OT_ERROR_INVALID_ARGS  Log level value is invalid.
+ * @retval OT_ERROR_NOT_CAPABLE   Instance-aware logging is not enabled in a multi-instance configuration.
+ */
+otError otSetLogLevel(otInstance *aInstance, otLogLevel aLogLevel);
+
+/**
+ * Returns the current global log level.
+ *
+ * In a single-instance configuration, this function behaves the same as `otGetLogLevel()`.
+ * In a multi-instance configuration, it returns the global log level which is used for all instances.
+ *
+ * @returns The global log level.
+ */
 otLogLevel otLoggingGetLevel(void);
 
 /**
- * Sets the log level.
+ * Sets the global log level.
  *
  * @note This function requires `OPENTHREAD_CONFIG_LOG_LEVEL_DYNAMIC_ENABLE=1`.
  *
+ * In a single-instance configuration, this function behaves the same as `otSetLogLevel()` (which is the recommended
+ * function to use).
+ *
+ * In a multi-instance configuration, it sets the global log level which is used by all instances. The log level can
+ * be explicitly set on a specific instance using `otSetLogLevel()`, which will then be used instead of the global
+ * value.
+ *
  * @param[in]  aLogLevel  The log level.
  *
- * @retval OT_ERROR_NONE            Successfully updated log level.
+ * @retval OT_ERROR_NONE          Successfully updated the log level.
  * @retval OT_ERROR_INVALID_ARGS  Log level value is invalid.
  */
 otError otLoggingSetLevel(otLogLevel aLogLevel);

include/openthread/platform/logging.h

@@ -175,8 +175,11 @@ void otPlatLogOutput(otInstance *aInstance, otLogLevel aLogLevel, const char *aL
 /**
  * Handles OpenThread log level changes.
  *
- * This platform function is called whenever the OpenThread log level changes.
- * This platform function is optional since an empty weak implementation has been provided.
+ * This platform function is optional. An empty weak implementation is provided by OpenThread core.
+ *
+ * This platform function is called whenever the OpenThread log level changes:
+ * - In a single-instance configuration, this is called when the log level changes.
+ * - In a multi-instance configuration, this is called when the global log level changes.
  *
  * @note Only applicable when `OPENTHREAD_CONFIG_LOG_LEVEL_DYNAMIC_ENABLE=1`.
  *
@@ -184,6 +187,21 @@ void otPlatLogOutput(otInstance *aInstance, otLogLevel aLogLevel, const char *aL
  */
 void otPlatLogHandleLevelChanged(otLogLevel aLogLevel);
 
+/**
+ * Handles OpenThread instance-specific log level changes.
+ *
+ * This platform function is optional. An empty weak implementation is provided by OpenThread core.
+ *
+ * This platform function is called whenever the instance-specific log level changes:
+ * - In a single-instance configuration, this is called along with `otPlatLogHandleLevelChanged()`.
+ * - In a multi-instance configuration, if `OPENTHREAD_CONFIG_LOG_INSTANCE_AWARE_API_ENABLE` is used, this is called
+ *   when the instance-specific log level changes.
+ *
+ * @param[in]  aInstance  A pointer to the OpenThread instance.
+ * @param[in]  aLogLevel  The new OpenThread log level for the instance.
+ */
+void otPlatLogHandleLogLevelChanged(otInstance *aInstance, otLogLevel aLogLevel);
+
 /**
  * @}
  */

src/cli/cli.cpp

@@ -3033,13 +3033,13 @@ template <> otError Interpreter::Process<Cmd("log")>(Arg aArgs[])
      * @endcode
      * @par
      * Get the log level.
-     * @sa otLoggingGetLevel
+     * @sa otGetLogLevel
      */
     if (aArgs[0] == "level")
     {
         if (aArgs[1].IsEmpty())
         {
-            OutputLine("%d", otLoggingGetLevel());
+            OutputLine("%u", otGetLogLevel(GetInstancePtr()));
         }
         else
         {
@@ -3053,12 +3053,12 @@ template <> otError Interpreter::Process<Cmd("log")>(Arg aArgs[])
              * Done
              * @endcode
              * @par api_copy
-             * #otLoggingSetLevel
+             * #otSetLogLevel
              * @cparam log level @ca{level}
              */
             VerifyOrExit(aArgs[2].IsEmpty(), error = OT_ERROR_INVALID_ARGS);
             SuccessOrExit(error = aArgs[1].ParseAsUint8(level));
-            error = otLoggingSetLevel(static_cast<otLogLevel>(level));
+            error = otSetLogLevel(GetInstancePtr(), static_cast<otLogLevel>(level));
 #else
             error = OT_ERROR_INVALID_ARGS;
 #endif

src/core/api/logging_api.cpp

@@ -37,20 +37,43 @@
 
 using namespace ot;
 
-otLogLevel otLoggingGetLevel(void) { return static_cast<otLogLevel>(Instance::GetLogLevel()); }
+otLogLevel otGetLogLevel(otInstance *aInstance) { return MapEnum(AsCoreType(aInstance).GetLogLevel()); }
+
+otLogLevel otLoggingGetLevel(void)
+{
+    LogLevel level;
+
+#if !OPENTHREAD_CONFIG_MULTIPLE_INSTANCE_ENABLE
+    level = Instance::Get().GetLogLevel();
+#else
+    level = Instance::GetGlobalLogLevel();
+#endif
+
+    return MapEnum(level);
+}
 
 #if OPENTHREAD_CONFIG_LOG_LEVEL_DYNAMIC_ENABLE
+
+otError otSetLogLevel(otInstance *aInstance, otLogLevel aLogLevel)
+{
+    return AsCoreType(aInstance).SetLogLevel(MapEnum(aLogLevel));
+}
+
 otError otLoggingSetLevel(otLogLevel aLogLevel)
 {
-    Error error = kErrorNone;
+    Error    error;
+    LogLevel level = MapEnum(aLogLevel);
 
-    VerifyOrExit(aLogLevel <= kLogLevelDebg && aLogLevel >= kLogLevelNone, error = kErrorInvalidArgs);
-    Instance::SetLogLevel(static_cast<LogLevel>(aLogLevel));
+#if !OPENTHREAD_CONFIG_MULTIPLE_INSTANCE_ENABLE
+    error = Instance::Get().SetLogLevel(level);
+#else
+    error = Instance::SetGlobalLogLevel(level);
+#endif
 
-exit:
     return error;
 }
-#endif
+
+#endif // OPENTHREAD_CONFIG_LOG_LEVEL_DYNAMIC_ENABLE
 
 static const char kPlatformModuleName[] = "Platform";
 

src/core/common/log.cpp

@@ -139,9 +139,22 @@ void Logger::Log(const char *aModuleName, LogLevel aLogLevel, Error aError, cons
 #endif
 
 #if OPENTHREAD_CONFIG_LOG_LEVEL_DYNAMIC_ENABLE
-    VerifyOrExit(Instance::GetLogLevel() >= aLogLevel);
+
+#if !OPENTHREAD_CONFIG_MULTIPLE_INSTANCE_ENABLE
+    VerifyOrExit(Instance::Get().GetLogLevel() >= aLogLevel);
+#elif !OPENTHREAD_CONFIG_LOG_INSTANCE_AWARE_API_ENABLE
+    VerifyOrExit(Instance::GetGlobalLogLevel() >= aLogLevel);
+#else
+    {
+        Instance *instance = Instance::GetActiveInstance();
+
+        VerifyOrExit(instance != nullptr);
+        VerifyOrExit(instance->GetLogLevel() >= aLogLevel);
+    }
 #endif
 
+#endif // OPENTHREAD_CONFIG_LOG_LEVEL_DYNAMIC_ENABLE
+
 #if OPENTHREAD_CONFIG_LOG_PREPEND_LEVEL
     {
         static const char kLevelChars[] = {

src/core/common/log.hpp

@@ -40,6 +40,7 @@
 #include <openthread/platform/logging.h>
 #include <openthread/platform/toolchain.h>
 
+#include "common/as_core_type.hpp"
 #include "common/error.hpp"
 
 namespace ot {
@@ -460,6 +461,8 @@ typedef otLogHexDumpInfo HexDumpInfo; ///< Represents the hex dump info.
  */
 Error GenerateNextHexDumpLine(HexDumpInfo &aInfo);
 
+DefineMapEnum(otLogLevel, LogLevel);
+
 } // namespace ot
 
 #endif // OT_CORE_COMMON_LOG_HPP_

src/core/instance/instance.cpp

@@ -73,8 +73,8 @@ Utils::Heap *Instance::sHeap{nullptr};
 #endif
 #endif
 
-#if OPENTHREAD_CONFIG_LOG_LEVEL_DYNAMIC_ENABLE
-LogLevel Instance::sLogLevel = static_cast<LogLevel>(OPENTHREAD_CONFIG_LOG_LEVEL_INIT);
+#if OPENTHREAD_CONFIG_LOG_LEVEL_DYNAMIC_ENABLE && OPENTHREAD_CONFIG_MULTIPLE_INSTANCE_ENABLE
+LogLevel Instance::sGlobalLogLevel = static_cast<LogLevel>(OPENTHREAD_CONFIG_LOG_LEVEL_INIT);
 #endif
 
 Instance::Instance(void)
@@ -316,6 +316,13 @@ Instance::Instance(void)
 #endif
 #if OPENTHREAD_CONFIG_POWER_CALIBRATION_ENABLE && OPENTHREAD_CONFIG_PLATFORM_POWER_CALIBRATION_ENABLE
     , mPowerCalibration(*this)
+#endif
+#if OPENTHREAD_CONFIG_LOG_LEVEL_DYNAMIC_ENABLE
+    , mLogLevel(static_cast<LogLevel>(OPENTHREAD_CONFIG_LOG_LEVEL_INIT))
+#if OPENTHREAD_CONFIG_MULTIPLE_INSTANCE_ENABLE
+    , mIsLogLevelSet(false)
+#else
+#endif
 #endif
     , mIsInitialized(false)
     , mId(Random::NonCrypto::GetUint32())
@@ -578,17 +585,53 @@ void Instance::ResetBufferInfo(void) { Get<MessagePool>().ResetMaxUsedBufferCoun
 
 #if OPENTHREAD_CONFIG_LOG_LEVEL_DYNAMIC_ENABLE
 
-void Instance::SetLogLevel(LogLevel aLogLevel)
+Error Instance::SetLogLevel(LogLevel aLogLevel)
 {
-    if (aLogLevel != sLogLevel)
+    Error error = kErrorNone;
+
+    VerifyOrExit(aLogLevel <= kLogLevelDebg, error = kErrorInvalidArgs);
+
+#if OPENTHREAD_CONFIG_MULTIPLE_INSTANCE_ENABLE && !OPENTHREAD_CONFIG_LOG_INSTANCE_AWARE_API_ENABLE
+    ExitNow(error = kErrorNotCapable);
+#else
+    VerifyOrExit(mLogLevel != aLogLevel);
+    mLogLevel = aLogLevel;
+
+#if OPENTHREAD_CONFIG_MULTIPLE_INSTANCE_ENABLE
+    mIsLogLevelSet = true;
+#else
+    otPlatLogHandleLevelChanged(mLogLevel);
+#endif
+    otPlatLogHandleLogLevelChanged(this, mLogLevel);
+#endif
+
+exit:
+    return error;
+}
+
+#if OPENTHREAD_CONFIG_MULTIPLE_INSTANCE_ENABLE
+Error Instance::SetGlobalLogLevel(LogLevel aLogLevel)
 {
-        sLogLevel = aLogLevel;
-        otPlatLogHandleLevelChanged(sLogLevel);
-    }
+    Error error = kErrorNone;
+
+    VerifyOrExit(aLogLevel <= kLogLevelDebg, error = kErrorInvalidArgs);
+    VerifyOrExit(sGlobalLogLevel != aLogLevel);
+    sGlobalLogLevel = aLogLevel;
+    otPlatLogHandleLevelChanged(sGlobalLogLevel);
+
+exit:
+    return error;
 }
+#endif
 
 extern "C" OT_TOOL_WEAK void otPlatLogHandleLevelChanged(otLogLevel aLogLevel) { OT_UNUSED_VARIABLE(aLogLevel); }
 
-#endif
+extern "C" OT_TOOL_WEAK void otPlatLogHandleLogLevelChanged(otInstance *aInstance, otLogLevel aLogLevel)
+{
+    OT_UNUSED_VARIABLE(aInstance);
+    OT_UNUSED_VARIABLE(aLogLevel);
+}
+
+#endif // OPENTHREAD_CONFIG_LOG_LEVEL_DYNAMIC_ENABLE
 
 } // namespace ot

src/core/instance/instance.hpp

@@ -317,14 +317,30 @@ public:
      *
      * @returns The log level.
      */
-    static LogLevel GetLogLevel(void)
-#if OPENTHREAD_CONFIG_LOG_LEVEL_DYNAMIC_ENABLE
-    {
-        return sLogLevel;
-    }
-#else
+    LogLevel GetLogLevel(void) const
     {
+#if !OPENTHREAD_CONFIG_LOG_LEVEL_DYNAMIC_ENABLE
         return static_cast<LogLevel>(OPENTHREAD_CONFIG_LOG_LEVEL);
+#elif !OPENTHREAD_CONFIG_MULTIPLE_INSTANCE_ENABLE
+        return mLogLevel;
+#else
+        return (mIsLogLevelSet) ? mLogLevel : sGlobalLogLevel;
+#endif
+    }
+
+#if OPENTHREAD_CONFIG_MULTIPLE_INSTANCE_ENABLE
+    /**
+     * Returns the global log level.
+     *
+     * @returns The global log level.
+     */
+    static LogLevel GetGlobalLogLevel(void)
+    {
+#if !OPENTHREAD_CONFIG_LOG_LEVEL_DYNAMIC_ENABLE
+        return static_cast<LogLevel>(OPENTHREAD_CONFIG_LOG_LEVEL);
+#else
+        return sGlobalLogLevel;
+#endif
     }
 #endif
 
@@ -333,9 +349,25 @@ public:
      * Sets the log level.
      *
      * @param[in] aLogLevel  A log level.
+     *
+     * @retval kErrorNone         Successfully updated the log level.
+     * @retval kErrorInvalidArgs  The given log level is invalid.
+     * @retval kErrorNotCapable   Instance-aware logging is not enabled in a multi-instance configuration.
      */
-    static void SetLogLevel(LogLevel aLogLevel);
+    Error SetLogLevel(LogLevel aLogLevel);
+
+#if OPENTHREAD_CONFIG_MULTIPLE_INSTANCE_ENABLE
+    /**
+     * Sets the global log level.
+     *
+     * @param[in] aLogLevel  A log level.
+     *
+     * @retval kErrorNone         Successfully updated the log level.
+     * @retval kErrorInvalidArgs  The given log level is invalid.
+     */
+    static Error SetGlobalLogLevel(LogLevel aLogLevel);
 #endif
+#endif // OPENTHREAD_CONFIG_LOG_LEVEL_DYNAMIC_ENABLE
 
     /**
      * Finalizes the OpenThread instance.
@@ -461,8 +493,8 @@ private:
     //-----------------------------------------------------------------------------------------------------------------
     // `static` variables
 
-#if OPENTHREAD_CONFIG_LOG_LEVEL_DYNAMIC_ENABLE
-    static LogLevel sLogLevel;
+#if OPENTHREAD_CONFIG_LOG_LEVEL_DYNAMIC_ENABLE && OPENTHREAD_CONFIG_MULTIPLE_INSTANCE_ENABLE
+    static LogLevel sGlobalLogLevel;
 #endif
 
 #if (OPENTHREAD_MTD || OPENTHREAD_FTD) && !OPENTHREAD_CONFIG_HEAP_EXTERNAL_ENABLE
@@ -796,6 +828,13 @@ private:
     Utils::PowerCalibration mPowerCalibration;
 #endif
 
+#if OPENTHREAD_CONFIG_LOG_LEVEL_DYNAMIC_ENABLE
+    LogLevel mLogLevel;
+#if OPENTHREAD_CONFIG_MULTIPLE_INSTANCE_ENABLE
+    bool mIsLogLevelSet;
+#endif
+#endif
+
     bool mIsInitialized;
 
     uint32_t mId;

src/core/thread/mesh_forwarder.cpp

@@ -1547,7 +1547,7 @@ void MeshForwarder::LogMessage(MessageAction       aAction,
         break;
     }
 
-    VerifyOrExit(Instance::GetLogLevel() >= logLevel);
+    VerifyOrExit(GetInstance().GetLogLevel() >= logLevel);
 
     switch (aMessage.GetType())
     {

src/core/thread/radio_selector.cpp

@@ -361,7 +361,7 @@ void RadioSelector::Log(LogLevel        aLogLevel,
     String<kRadioPreferenceStringSize> preferenceString;
     bool                               isFirstEntry = true;
 
-    VerifyOrExit(Instance::GetLogLevel() >= aLogLevel);
+    VerifyOrExit(GetInstance().GetLogLevel() >= aLogLevel);
 
     for (Mac::RadioType radio : sRadioSelectionOrder)
     {

src/ncp/ncp_base.cpp

@@ -2589,7 +2589,7 @@ template <> otError NcpBase::HandlePropertyGet<SPINEL_PROP_DEBUG_TEST_WATCHDOG>(
 
 template <> otError NcpBase::HandlePropertyGet<SPINEL_PROP_DEBUG_NCP_LOG_LEVEL>(void)
 {
-    return mEncoder.WriteUint8(ConvertLogLevel(otLoggingGetLevel()));
+    return mEncoder.WriteUint8(ConvertLogLevel(otGetLogLevel(mInstance)));
 }
 
 #if OPENTHREAD_CONFIG_LOG_LEVEL_DYNAMIC_ENABLE
@@ -2633,7 +2633,7 @@ template <> otError NcpBase::HandlePropertySet<SPINEL_PROP_DEBUG_NCP_LOG_LEVEL>(
         ExitNow(error = OT_ERROR_INVALID_ARGS);
     }
 
-    IgnoreError(otLoggingSetLevel(logLevel));
+    IgnoreError(otSetLogLevel(mInstance, logLevel));
 
 exit:
     return error;

tests/fuzz/fuzz_cli.cpp

@@ -107,7 +107,7 @@ extern "C" int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size)
 
     Node &node = nexus.CreateNode();
 
-    node.GetInstance().SetLogLevel(kLogLevelInfo);
+    SuccessOrQuit(node.GetInstance().SetLogLevel(kLogLevelInfo));
 
     otCliInit(&node.GetInstance(), CliOutput, nullptr);
 

tests/fuzz/fuzz_icmp6.cpp

@@ -98,7 +98,7 @@ extern "C" int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size)
 
     Node &node = nexus.CreateNode();
 
-    node.GetInstance().SetLogLevel(kLogLevelInfo);
+    SuccessOrQuit(node.GetInstance().SetLogLevel(kLogLevelInfo));
 
     node.GetInstance().Get<BorderRouter::InfraIf>().Init(/* aInfraIfIndex */ 1, /* aInfraIfIsRunning */ true);
     SuccessOrQuit(node.GetInstance().Get<BorderRouter::RoutingManager>().SetEnabled(true));

tests/fuzz/fuzz_ip6.cpp

@@ -110,7 +110,7 @@ extern "C" int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size)
 
     Node &node = nexus.CreateNode();
 
-    node.GetInstance().SetLogLevel(kLogLevelInfo);
+    SuccessOrQuit(node.GetInstance().SetLogLevel(kLogLevelInfo));
 
     node.GetInstance().Get<BorderRouter::InfraIf>().Init(/* aInfraIfIndex */ 1, /* aInfraIfIsRunning */ true);
     SuccessOrQuit(node.GetInstance().Get<BorderRouter::RoutingManager>().SetEnabled(true));

tests/fuzz/fuzz_mdns.cpp

@@ -109,7 +109,7 @@ extern "C" int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size)
 
     Node &node = nexus.CreateNode();
 
-    node.GetInstance().SetLogLevel(kLogLevelInfo);
+    SuccessOrQuit(node.GetInstance().SetLogLevel(kLogLevelInfo));
 
     node.GetInstance().Get<BorderRouter::InfraIf>().Init(/* aInfraIfIndex */ 1, /* aInfraIfIsRunning */ true);
     SuccessOrQuit(node.GetInstance().Get<BorderRouter::RoutingManager>().SetEnabled(true));

tests/fuzz/fuzz_radio-one-node.cpp

@@ -108,7 +108,7 @@ extern "C" int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size)
 
     Node &node = nexus.CreateNode();
 
-    node.GetInstance().SetLogLevel(kLogLevelInfo);
+    SuccessOrQuit(node.GetInstance().SetLogLevel(kLogLevelInfo));
 
     node.GetInstance().Get<BorderRouter::InfraIf>().Init(/* aInfraIfIndex */ 1, /* aInfraIfIsRunning */ true);
     SuccessOrQuit(node.GetInstance().Get<BorderRouter::RoutingManager>().SetEnabled(true));

tests/fuzz/fuzz_trel.cpp

@@ -99,7 +99,7 @@ extern "C" int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size)
 
     Node &node = nexus.CreateNode();
 
-    node.GetInstance().SetLogLevel(kLogLevelInfo);
+    SuccessOrQuit(node.GetInstance().SetLogLevel(kLogLevelInfo));
 
     node.GetInstance().Get<BorderRouter::InfraIf>().Init(/* aInfraIfIndex */ 1, /* aInfraIfIsRunning */ true);
     SuccessOrQuit(node.GetInstance().Get<BorderRouter::RoutingManager>().SetEnabled(true));

tests/nexus/test_1_1_5_1_1.cpp

@@ -75,7 +75,7 @@ void Test5_1_1(void)
 
     nexus.AdvanceTime(0);
 
-    Instance::SetLogLevel(kLogLevelInfo);
+    SuccessOrQuit(Instance::SetGlobalLogLevel(kLogLevelInfo));
 
     Log("---------------------------------------------------------------------------------------");
     Log("Step 1: Leader forms network");

tests/nexus/test_1_1_5_1_10.cpp

@@ -95,7 +95,7 @@ void Test5_1_10(void)
 
     nexus.AdvanceTime(0);
 
-    Instance::SetLogLevel(kLogLevelInfo);
+    SuccessOrQuit(Instance::SetGlobalLogLevel(kLogLevelInfo));
 
     Log("---------------------------------------------------------------------------------------");
     Log("Step 1: Leader, Router_1, Router_2");

tests/nexus/test_1_1_5_1_12.cpp

@@ -87,7 +87,7 @@ void Test5_1_12(void)
 
     nexus.AdvanceTime(0);
 
-    Instance::SetLogLevel(kLogLevelInfo);
+    SuccessOrQuit(Instance::SetGlobalLogLevel(kLogLevelInfo));
 
     Log("---------------------------------------------------------------------------------------");
     Log("Step 1: Ensure topology is formed correctly.");

tests/nexus/test_1_1_5_1_3.cpp

@@ -106,7 +106,7 @@ void Test5_1_3(void)
 
     nexus.AdvanceTime(0);
 
-    Instance::SetLogLevel(kLogLevelInfo);
+    SuccessOrQuit(Instance::SetGlobalLogLevel(kLogLevelInfo));
 
     /**
      * Step 1: Router_2

tests/nexus/test_1_1_5_1_4.cpp

@@ -95,7 +95,7 @@ void Test5_1_4(void)
 
     nexus.AdvanceTime(0);
 
-    Instance::SetLogLevel(kLogLevelInfo);
+    SuccessOrQuit(Instance::SetGlobalLogLevel(kLogLevelInfo));
 
     /**
      * Step 1: Router_2

tests/nexus/test_1_1_5_1_5.cpp

@@ -84,7 +84,7 @@ void Test5_1_5(void)
 
     nexus.AdvanceTime(0);
 
-    Instance::SetLogLevel(kLogLevelInfo);
+    SuccessOrQuit(Instance::SetGlobalLogLevel(kLogLevelInfo));
 
     Log("---------------------------------------------------------------------------------------");
     Log("Step 1: All");

tests/nexus/test_1_1_5_1_6.cpp

@@ -78,7 +78,7 @@ void Test5_1_6(void)
 
     nexus.AdvanceTime(0);
 
-    Instance::SetLogLevel(kLogLevelInfo);
+    SuccessOrQuit(Instance::SetGlobalLogLevel(kLogLevelInfo));
 
     Log("---------------------------------------------------------------------------------------");
     Log("Step 0: Verify topology is formed correctly");

tests/nexus/test_1_1_5_1_8.cpp

@@ -92,7 +92,7 @@ void Test5_1_8(void)
     router3.SetName("ROUTER_3");
     dut.SetName("ROUTER_4");
 
-    Instance::SetLogLevel(kLogLevelInfo);
+    SuccessOrQuit(Instance::SetGlobalLogLevel(kLogLevelInfo));
 
     nexus.AdvanceTime(0);
 

tests/nexus/test_1_1_5_1_9.cpp

@@ -104,7 +104,7 @@ void Test5_1_9(void)
 
     nexus.AdvanceTime(0);
 
-    Instance::SetLogLevel(kLogLevelInfo);
+    SuccessOrQuit(Instance::SetGlobalLogLevel(kLogLevelInfo));
 
     /**
      * Step 1: Leader, Router_1, REED_2, REED_1

tests/nexus/test_1_1_5_2_1.cpp

@@ -95,7 +95,7 @@ void Test5_2_1(void)
 
     nexus.AdvanceTime(0);
 
-    Instance::SetLogLevel(kLogLevelInfo);
+    SuccessOrQuit(Instance::SetGlobalLogLevel(kLogLevelInfo));
 
     Log("---------------------------------------------------------------------------------------");
     Log("Step 1: Router_1 (DUT)");

tests/nexus/test_1_1_5_2_3.cpp

@@ -86,7 +86,7 @@ void Test5_2_3(void)
 
     nexus.AdvanceTime(0);
 
-    Instance::SetLogLevel(kLogLevelNote);
+    SuccessOrQuit(Instance::SetGlobalLogLevel(kLogLevelNote));
 
     leader.Get<Mle::Mle>().SetRouterUpgradeThreshold(kMaxRouters);
     leader.Get<Mle::Mle>().SetRouterDowngradeThreshold(kMaxRouters);

tests/nexus/test_1_1_5_2_4.cpp

@@ -107,7 +107,7 @@ void Test5_2_4(void)
 
     nexus.AdvanceTime(0);
 
-    Instance::SetLogLevel(kLogLevelNote);
+    SuccessOrQuit(Instance::SetGlobalLogLevel(kLogLevelNote));
 
     /** Use AllowList feature to restrict the topology. */
     for (uint16_t i = 0; i < kNumRouters; i++)

tests/nexus/test_1_1_5_2_5.cpp

@@ -110,7 +110,7 @@ void Test5_2_5(void)
     reed1.SetName("REED_1");
 
     nexus.AdvanceTime(0);
-    Instance::SetLogLevel(kLogLevelNote);
+    SuccessOrQuit(Instance::SetGlobalLogLevel(kLogLevelNote));
 
     /**
      * Use AllowList feature to restrict the topology.

tests/nexus/test_1_1_5_2_6.cpp

@@ -108,7 +108,7 @@ void Test_5_2_6(void)
 
     nexus.AdvanceTime(0);
 
-    Instance::SetLogLevel(kLogLevelNote);
+    SuccessOrQuit(Instance::SetGlobalLogLevel(kLogLevelNote));
 
     leader.Get<Mle::Mle>().SetRouterUpgradeThreshold(kRouterUpgradeThreshold);
     leader.Get<Mle::Mle>().SetRouterDowngradeThreshold(kRouterDowngradeThreshold);

tests/nexus/test_1_1_5_2_7.cpp

@@ -109,7 +109,7 @@ void Test5_2_7(void)
 
     nexus.AdvanceTime(0);
 
-    Instance::SetLogLevel(kLogLevelNote);
+    SuccessOrQuit(Instance::SetGlobalLogLevel(kLogLevelNote));
 
     Log("---------------------------------------------------------------------------------------");
     Log("Step 1: All");

tests/nexus/test_1_1_5_3_1.cpp

@@ -83,7 +83,7 @@ void Test5_3_1(void)
 
     nexus.AdvanceTime(0);
 
-    Instance::SetLogLevel(kLogLevelNote);
+    SuccessOrQuit(Instance::SetGlobalLogLevel(kLogLevelNote));
 
     Log("---------------------------------------------------------------------------------------");
     Log("Step 1: Router_1 and Leader");

tests/nexus/test_1_1_5_3_10.cpp

@@ -119,7 +119,7 @@ void Test5_3_10(void)
     med1.SetName("MED_1");
 
     nexus.AdvanceTime(0);
-    Instance::SetLogLevel(kLogLevelNote);
+    SuccessOrQuit(Instance::SetGlobalLogLevel(kLogLevelNote));
 
     Log("Step 1: Border Router");
 

tests/nexus/test_1_1_5_3_11.cpp

@@ -99,7 +99,7 @@ void Test5_3_11(void)
 
     nexus.AdvanceTime(0);
 
-    Instance::SetLogLevel(kLogLevelNote);
+    SuccessOrQuit(Instance::SetGlobalLogLevel(kLogLevelNote));
 
     Log("---------------------------------------------------------------------------------------");
     Log("Step 1: All");

tests/nexus/test_1_1_5_3_2.cpp

@@ -86,7 +86,7 @@ void Test5_3_2(void)
     dut.SetName("DUT");
     sed1.SetName("SED_1");
 
-    Instance::SetLogLevel(kLogLevelNote);
+    SuccessOrQuit(Instance::SetGlobalLogLevel(kLogLevelNote));
 
     /**
      * Step 1: All

tests/nexus/test_1_1_5_3_3.cpp

@@ -109,7 +109,7 @@ void Test5_3_3(void)
 
     nexus.AdvanceTime(0);
 
-    Instance::SetLogLevel(kLogLevelNote);
+    SuccessOrQuit(Instance::SetGlobalLogLevel(kLogLevelNote));
 
     Log("---------------------------------------------------------------------------------------");
     Log("Step 1: All");

tests/nexus/test_1_1_5_3_4.cpp

@@ -100,7 +100,7 @@ void Test5_3_4(void)
 
     Node *meds[] = {&med1, &med2, &med3, &med4};
 
-    Instance::SetLogLevel(kLogLevelNote);
+    SuccessOrQuit(Instance::SetGlobalLogLevel(kLogLevelNote));
 
     Log("---------------------------------------------------------------------------------------");
     Log("Step 1: All");

tests/nexus/test_1_1_5_3_5.cpp

@@ -106,7 +106,7 @@ void Test5_3_5(void)
 
     nexus.AdvanceTime(0);
 
-    Instance::SetLogLevel(kLogLevelNote);
+    SuccessOrQuit(Instance::SetGlobalLogLevel(kLogLevelNote));
 
     Log("---------------------------------------------------------------------------------------");
     Log("Step 1: All");

tests/nexus/test_1_1_5_3_6.cpp

@@ -80,7 +80,7 @@ void Test5_3_6(void)
 
     nexus.AdvanceTime(0);
 
-    Instance::SetLogLevel(kLogLevelNote);
+    SuccessOrQuit(Instance::SetGlobalLogLevel(kLogLevelNote));
 
     Log("---------------------------------------------------------------------------------------");
     Log("Step 1: All");

tests/nexus/test_1_1_5_3_7.cpp

@@ -104,7 +104,7 @@ void Test5_3_7(void)
 
     nexus.AdvanceTime(0);
 
-    Instance::SetLogLevel(kLogLevelNote);
+    SuccessOrQuit(Instance::SetGlobalLogLevel(kLogLevelNote));
 
     Log("---------------------------------------------------------------------------------------");
     Log("Step 1: All");

tests/nexus/test_1_1_5_3_8.cpp

@@ -123,7 +123,7 @@ void Test5_3_8(void)
 
     nexus.AdvanceTime(0);
 
-    Instance::SetLogLevel(kLogLevelNote);
+    SuccessOrQuit(Instance::SetGlobalLogLevel(kLogLevelNote));
 
     /** Use AllowList feature to restrict the topology. */
     leader.AllowList(br);

tests/nexus/test_1_1_5_3_9.cpp

@@ -125,7 +125,7 @@ void Test5_3_9(void)
 
     nexus.AdvanceTime(0);
 
-    Instance::SetLogLevel(kLogLevelNote);
+    SuccessOrQuit(Instance::SetGlobalLogLevel(kLogLevelNote));
 
     /**
      * Step 1: Leader

tests/nexus/test_1_1_5_5_1.cpp

@@ -89,7 +89,7 @@ void Test5_5_1(void)
 
     nexus.AdvanceTime(0);
 
-    Instance::SetLogLevel(kLogLevelNote);
+    SuccessOrQuit(Instance::SetGlobalLogLevel(kLogLevelNote));
 
     Log("---------------------------------------------------------------------------------------");
     Log("Step 1: All");

tests/nexus/test_1_1_5_5_2.cpp

@@ -105,7 +105,7 @@ void Test5_5_2(void)
     router1.SetName("ROUTER_1");
     med1.SetName("MED_1");
 
-    Instance::SetLogLevel(kLogLevelNote);
+    SuccessOrQuit(Instance::SetGlobalLogLevel(kLogLevelNote));
 
     /**
      * Step 1: All

tests/nexus/test_1_1_5_5_3.cpp

@@ -99,7 +99,7 @@ void Test5_5_3(void)
 
     nexus.AdvanceTime(0);
 
-    Instance::SetLogLevel(kLogLevelNote);
+    SuccessOrQuit(Instance::SetGlobalLogLevel(kLogLevelNote));
 
     Log("---------------------------------------------------------------------------------------");
     Log("Step 0: All");

tests/nexus/test_1_1_5_5_4_1.cpp

@@ -104,7 +104,7 @@ void Test5_5_4_1(void)
 
     nexus.AdvanceTime(0);
 
-    Instance::SetLogLevel(kLogLevelNote);
+    SuccessOrQuit(Instance::SetGlobalLogLevel(kLogLevelNote));
 
     Log("---------------------------------------------------------------------------------------");
     Log("Step 1: All");

tests/nexus/test_1_1_5_5_4_2.cpp

@@ -112,7 +112,7 @@ void Test5_5_4_2(void)
 
     nexus.AdvanceTime(0);
 
-    Instance::SetLogLevel(kLogLevelNote);
+    SuccessOrQuit(Instance::SetGlobalLogLevel(kLogLevelNote));
 
     /**
      * Step 1: All

tests/nexus/test_1_1_5_5_5.cpp

@@ -99,7 +99,7 @@ void Test5_5_5(void)
 
     nexus.AdvanceTime(0);
 
-    Instance::SetLogLevel(kLogLevelNote);
+    SuccessOrQuit(Instance::SetGlobalLogLevel(kLogLevelNote));
 
     Log("---------------------------------------------------------------------------------------");
     Log("Step 1: All");

tests/nexus/test_1_1_5_5_7.cpp

@@ -95,7 +95,7 @@ void Test5_5_7(void)
     router2.SetName("ROUTER_2");
     router3.SetName("ROUTER_3");
 
-    Instance::SetLogLevel(kLogLevelNote);
+    SuccessOrQuit(Instance::SetGlobalLogLevel(kLogLevelNote));
 
     Log("---------------------------------------------------------------------------------------");
     Log("Step 1: All");

tests/nexus/test_1_1_5_6_1.cpp

@@ -101,7 +101,7 @@ void Test5_6_1(void)
 
     nexus.AdvanceTime(0);
 
-    Instance::SetLogLevel(kLogLevelNote);
+    SuccessOrQuit(Instance::SetGlobalLogLevel(kLogLevelNote));
 
     Log("---------------------------------------------------------------------------------------");
     /**

tests/nexus/test_1_1_5_6_2.cpp

@@ -104,7 +104,7 @@ void Test5_6_2(void)
 
     nexus.AdvanceTime(0);
 
-    Instance::SetLogLevel(kLogLevelNote);
+    SuccessOrQuit(Instance::SetGlobalLogLevel(kLogLevelNote));
 
     Log("---------------------------------------------------------------------------------------");
     /**

tests/nexus/test_1_1_5_6_3.cpp

@@ -96,7 +96,7 @@ void Test5_6_3(void)
 
     nexus.AdvanceTime(0);
 
-    Instance::SetLogLevel(kLogLevelNote);
+    SuccessOrQuit(Instance::SetGlobalLogLevel(kLogLevelNote));
 
     Log("Step 1: All");
 

tests/nexus/test_1_1_5_6_4.cpp

@@ -98,7 +98,7 @@ void Test5_6_4(void)
 
     nexus.AdvanceTime(0);
 
-    Instance::SetLogLevel(kLogLevelNote);
+    SuccessOrQuit(Instance::SetGlobalLogLevel(kLogLevelNote));
 
     Log("---------------------------------------------------------------------------------------");
     Log("Step 1: All");

tests/nexus/test_1_1_5_6_5.cpp

@@ -88,7 +88,7 @@ void Test5_6_5(void)
 
     nexus.AdvanceTime(0);
 
-    Instance::SetLogLevel(kLogLevelNote);
+    SuccessOrQuit(Instance::SetGlobalLogLevel(kLogLevelNote));
 
     Log("---------------------------------------------------------------------------------------");
     Log("Step 1: All");

tests/nexus/test_1_1_5_6_6.cpp

@@ -112,7 +112,7 @@ void Test5_6_6(void)
 
     nexus.AdvanceTime(0);
 
-    Instance::SetLogLevel(kLogLevelNote);
+    SuccessOrQuit(Instance::SetGlobalLogLevel(kLogLevelNote));
 
     Log("---------------------------------------------------------------------------------------");
     Log("Step 1: All");

tests/nexus/test_1_1_5_6_7.cpp

@@ -126,7 +126,7 @@ void Test5_6_7(void)
 
     nexus.AdvanceTime(0);
 
-    Instance::SetLogLevel(kLogLevelNote);
+    SuccessOrQuit(Instance::SetGlobalLogLevel(kLogLevelNote));
 
     Log("---------------------------------------------------------------------------------------");
     Log("Step 1: All");

tests/nexus/test_1_1_5_6_9.cpp

@@ -130,7 +130,7 @@ void Test5_6_9(void)
 
     nexus.AdvanceTime(0);
 
-    Instance::SetLogLevel(kLogLevelNote);
+    SuccessOrQuit(Instance::SetGlobalLogLevel(kLogLevelNote));
 
     med1.Get<Mle::Mle>().SetTimeout(kLargeTimeout);
     sed1.Get<Mle::Mle>().SetTimeout(kLargeTimeout);

tests/nexus/test_1_1_5_7_1.cpp

@@ -90,7 +90,7 @@ void Test5_7_1(void)
 
     nexus.AdvanceTime(0);
 
-    Instance::SetLogLevel(kLogLevelNote);
+    SuccessOrQuit(Instance::SetGlobalLogLevel(kLogLevelNote));
 
     /**
      * Step 1: All

tests/nexus/test_1_1_5_7_2.cpp

@@ -123,7 +123,7 @@ void Test5_7_2(void)
 
     nexus.AdvanceTime(0);
 
-    Instance::SetLogLevel(kLogLevelNote);
+    SuccessOrQuit(Instance::SetGlobalLogLevel(kLogLevelNote));
 
     Log("---------------------------------------------------------------------------------------");
     Log("Step 1: All");

tests/nexus/test_1_1_5_7_3.cpp

@@ -140,7 +140,7 @@ void Test5_7_3(void)
 
     nexus.AdvanceTime(0);
 
-    Instance::SetLogLevel(kLogLevelNote);
+    SuccessOrQuit(Instance::SetGlobalLogLevel(kLogLevelNote));
 
     Log("---------------------------------------------------------------------------------------");
     Log("Step 1: All");

tests/nexus/test_1_1_5_8_2.cpp

@@ -82,7 +82,7 @@ void Test5_8_2(void)
 
     nexus.AdvanceTime(0);
 
-    Instance::SetLogLevel(kLogLevelNote);
+    SuccessOrQuit(Instance::SetGlobalLogLevel(kLogLevelNote));
 
     Log("---------------------------------------------------------------------------------------");
     Log("Step 1: Leader forms the network");

tests/nexus/test_1_1_5_8_3.cpp

@@ -89,7 +89,7 @@ void Test5_8_3(void)
 
     nexus.AdvanceTime(0);
 
-    Instance::SetLogLevel(kLogLevelNote);
+    SuccessOrQuit(Instance::SetGlobalLogLevel(kLogLevelNote));
 
     Log("---------------------------------------------------------------------------------------");
     Log("Step 1: Leader forms network with KeySequenceCounter = 127");

tests/nexus/test_1_1_5_8_4.cpp

@@ -96,7 +96,7 @@ void Test5_8_4(void)
 
     nexus.AdvanceTime(0);
 
-    Instance::SetLogLevel(kLogLevelNote);
+    SuccessOrQuit(Instance::SetGlobalLogLevel(kLogLevelNote));
 
     Log("---------------------------------------------------------------------------------------");
     Log("Step 1: All");

tests/nexus/test_1_1_6_1_1.cpp

@@ -98,7 +98,7 @@ void RunTest6_1_1(Topology aTopology, const char *aJsonFile)
 
     nexus.AdvanceTime(0);
 
-    Instance::SetLogLevel(kLogLevelNote);
+    SuccessOrQuit(Instance::SetGlobalLogLevel(kLogLevelNote));
 
     if (aTopology == kTopologyA)
     {

tests/nexus/test_1_1_6_1_2.cpp

@@ -96,7 +96,7 @@ void RunTest6_1_2(Topology aTopology, const char *aJsonFile)
 
     nexus.AdvanceTime(0);
 
-    Instance::SetLogLevel(kLogLevelNote);
+    SuccessOrQuit(Instance::SetGlobalLogLevel(kLogLevelNote));
 
     /**
      * Step 1: All

tests/nexus/test_1_1_6_1_3.cpp

@@ -112,7 +112,7 @@ void RunTest6_1_3(Topology aTopology, const char *aJsonFile)
 
     nexus.AdvanceTime(0);
 
-    Instance::SetLogLevel(kLogLevelNote);
+    SuccessOrQuit(Instance::SetGlobalLogLevel(kLogLevelNote));
 
     Log("---------------------------------------------------------------------------------------");
     if (aTopology == kTopologyA)

tests/nexus/test_1_1_6_1_4.cpp

@@ -121,7 +121,7 @@ void Test6_1_4(void)
 
     nexus.AdvanceTime(0);
 
-    Instance::SetLogLevel(kLogLevelNote);
+    SuccessOrQuit(Instance::SetGlobalLogLevel(kLogLevelNote));
 
     Log("---------------------------------------------------------------------------------------");
     Log("Step 1: All");

tests/nexus/test_1_1_6_1_5.cpp

@@ -112,7 +112,7 @@ void Test6_1_5(void)
 
     nexus.AdvanceTime(kStartTime);
 
-    Instance::SetLogLevel(kLogLevelNote);
+    SuccessOrQuit(Instance::SetGlobalLogLevel(kLogLevelNote));
 
     Log("---------------------------------------------------------------------------------------");
     Log("Step 1: Setup the topology without the DUT. Ensure all routers and leader are sending MLE advertisements.");

tests/nexus/test_1_1_6_1_6.cpp

@@ -122,7 +122,7 @@ void RunTest6_1_6(Topology aTopology, const char *aJsonFile)
 
     nexus.AdvanceTime(0);
 
-    Instance::SetLogLevel(kLogLevelNote);
+    SuccessOrQuit(Instance::SetGlobalLogLevel(kLogLevelNote));
 
     /**
      * Step 1: All

tests/nexus/test_1_1_6_1_7.cpp

@@ -90,7 +90,7 @@ void RunTest6_1_7(const char *aJsonFile)
 
     nexus.AdvanceTime(0);
 
-    Instance::SetLogLevel(kLogLevelNote);
+    SuccessOrQuit(Instance::SetGlobalLogLevel(kLogLevelNote));
 
     Log("---------------------------------------------------------------------------------------");
     Log("Step 1: All");

tests/nexus/test_1_1_6_2_1.cpp

@@ -89,7 +89,7 @@ void RunTest6_2_1(Topology aTopology, const char *aJsonFile)
 
     nexus.AdvanceTime(0);
 
-    Instance::SetLogLevel(kLogLevelNote);
+    SuccessOrQuit(Instance::SetGlobalLogLevel(kLogLevelNote));
 
     /**
      * Step 1: All

tests/nexus/test_1_1_6_2_2.cpp

@@ -124,7 +124,7 @@ void RunTest_6_2_2(Topology aTopology, const char *aJsonFile)
 
     nexus.AdvanceTime(0);
 
-    Instance::SetLogLevel(kLogLevelNote);
+    SuccessOrQuit(Instance::SetGlobalLogLevel(kLogLevelNote));
 
     Log("---------------------------------------------------------------------------------------");
     Log("Step 1: All");

tests/nexus/test_1_1_6_3_1.cpp

@@ -127,7 +127,7 @@ void RunTest6_3_1(Topology aTopology, const char *aJsonFile)
 
     nexus.AdvanceTime(0);
 
-    Instance::SetLogLevel(kLogLevelNote);
+    SuccessOrQuit(Instance::SetGlobalLogLevel(kLogLevelNote));
 
     Log("---------------------------------------------------------------------------------------");
     if (aTopology == kTopologyA)

tests/nexus/test_1_1_6_3_2.cpp

@@ -109,7 +109,7 @@ void RunTest6_3_2(Topology aTopology, const char *aJsonFile)
 
     nexus.AdvanceTime(0);
 
-    Instance::SetLogLevel(kLogLevelNote);
+    SuccessOrQuit(Instance::SetGlobalLogLevel(kLogLevelNote));
 
     Log("---------------------------------------------------------------------------------------");
     Log("Step 1: All");

tests/nexus/test_1_1_6_4_1.cpp

@@ -113,7 +113,7 @@ void RunTest6_4_1(Topology aTopology, const char *aJsonFile)
 
     nexus.AdvanceTime(0);
 
-    Instance::SetLogLevel(kLogLevelNote);
+    SuccessOrQuit(Instance::SetGlobalLogLevel(kLogLevelNote));
 
     if (aTopology == kTopologyA)
     {

tests/nexus/test_1_1_6_4_2.cpp

@@ -115,7 +115,7 @@ void RunTest6_4_2(Topology aTopology, const char *aJsonFile)
 
     nexus.AdvanceTime(0);
 
-    Instance::SetLogLevel(kLogLevelNote);
+    SuccessOrQuit(Instance::SetGlobalLogLevel(kLogLevelNote));
 
     Log("---------------------------------------------------------------------------------------");
     Log("Step 1: All");

tests/nexus/test_1_1_6_5_1.cpp

@@ -114,7 +114,7 @@ void RunTest6_5_1(Topology aTopology, const char *aJsonFile)
 
     nexus.AdvanceTime(0);
 
-    Instance::SetLogLevel(kLogLevelNote);
+    SuccessOrQuit(Instance::SetGlobalLogLevel(kLogLevelNote));
 
     /**
      * Step 1: All

tests/nexus/test_1_1_6_5_2.cpp

@@ -112,7 +112,7 @@ void RunTest_6_5_2(Topology aTopology, const char *aJsonFile)
 
     nexus.AdvanceTime(0);
 
-    Instance::SetLogLevel(kLogLevelNote);
+    SuccessOrQuit(Instance::SetGlobalLogLevel(kLogLevelNote));
 
     Log("---------------------------------------------------------------------------------------");
     if (aTopology == kTopologyA)

tests/nexus/test_1_1_6_5_3.cpp

@@ -130,7 +130,7 @@ void RunTest6_5_3(Topology aTopology, const char *aJsonFile)
 
     nexus.AdvanceTime(0);
 
-    Instance::SetLogLevel(kLogLevelNote);
+    SuccessOrQuit(Instance::SetGlobalLogLevel(kLogLevelNote));
 
     /**
      * Step 1: All

tests/nexus/test_1_1_6_6_1.cpp

@@ -110,7 +110,7 @@ void RunTest6_6_1(Topology aTopology, const char *aJsonFile)
 
     nexus.AdvanceTime(0);
 
-    Instance::SetLogLevel(kLogLevelNote);
+    SuccessOrQuit(Instance::SetGlobalLogLevel(kLogLevelNote));
 
     if (aTopology == kTopologyA)
     {

tests/nexus/test_1_1_6_6_2.cpp

@@ -110,7 +110,7 @@ void RunTest6_6_2(Topology aTopology, const char *aJsonFile)
 
     nexus.AdvanceTime(0);
 
-    Instance::SetLogLevel(kLogLevelNote);
+    SuccessOrQuit(Instance::SetGlobalLogLevel(kLogLevelNote));
 
     if (aTopology == kTopologyA)
     {

tests/nexus/test_1_1_7_1_1.cpp

@@ -94,7 +94,7 @@ void Test7_1_1(const char *aJsonFile)
 
     nexus.AdvanceTime(0);
 
-    Instance::SetLogLevel(kLogLevelNote);
+    SuccessOrQuit(Instance::SetGlobalLogLevel(kLogLevelNote));
 
     /**
      * Step 1: Leader (DUT)

tests/nexus/test_1_1_7_1_2.cpp

@@ -99,7 +99,7 @@ void Test7_1_2(void)
 
     nexus.AdvanceTime(0);
 
-    Instance::SetLogLevel(kLogLevelNote);
+    SuccessOrQuit(Instance::SetGlobalLogLevel(kLogLevelNote));
 
     /**
      * Step 1: Leader

tests/nexus/test_1_1_7_1_3.cpp

@@ -99,7 +99,7 @@ void Test7_1_3(const char *aJsonFile)
 
     nexus.AdvanceTime(0);
 
-    Instance::SetLogLevel(kLogLevelNote);
+    SuccessOrQuit(Instance::SetGlobalLogLevel(kLogLevelNote));
 
     /**
      * Step 1: All

tests/nexus/test_1_1_7_1_4.cpp

@@ -101,7 +101,7 @@ void Test7_1_4(const char *aJsonFile)
 
     nexus.AdvanceTime(0);
 
-    Instance::SetLogLevel(kLogLevelNote);
+    SuccessOrQuit(Instance::SetGlobalLogLevel(kLogLevelNote));
 
     /**
      * Step 1: All

tests/nexus/test_1_1_7_1_5.cpp

@@ -82,7 +82,7 @@ void Test7_1_5(void)
 
     nexus.AdvanceTime(0);
 
-    Instance::SetLogLevel(kLogLevelNote);
+    SuccessOrQuit(Instance::SetGlobalLogLevel(kLogLevelNote));
 
     /**
      * Step 1: All

tests/nexus/test_1_1_7_1_6.cpp

@@ -109,7 +109,7 @@ void Test7_1_6(void)
 
     nexus.AdvanceTime(0);
 
-    Instance::SetLogLevel(kLogLevelNote);
+    SuccessOrQuit(Instance::SetGlobalLogLevel(kLogLevelNote));
 
     Log("---------------------------------------------------------------------------------------");
     Log("Step 1: All");

tests/nexus/test_1_1_7_1_7.cpp

@@ -111,7 +111,7 @@ void Test7_1_7(const char *aJsonFile)
 
     nexus.AdvanceTime(0);
 
-    Instance::SetLogLevel(kLogLevelNote);
+    SuccessOrQuit(Instance::SetGlobalLogLevel(kLogLevelNote));
 
     Log("---------------------------------------------------------------------------------------");
     Log("Step 1: All");

tests/nexus/test_1_1_7_1_8.cpp

@@ -107,7 +107,7 @@ void Test7_1_8(const char *aJsonFile)
 
     nexus.AdvanceTime(0);
 
-    Instance::SetLogLevel(kLogLevelNote);
+    SuccessOrQuit(Instance::SetGlobalLogLevel(kLogLevelNote));
 
     Log("---------------------------------------------------------------------------------------");
     Log("Step 1: All");

tests/nexus/test_1_1_8_1_1.cpp

@@ -154,7 +154,7 @@ void Test1_1_8_1_1(void)
 
     nexus.AdvanceTime(0);
 
-    Instance::SetLogLevel(kLogLevelNote);
+    SuccessOrQuit(Instance::SetGlobalLogLevel(kLogLevelNote));
 
     // Remove any existing key log file.
     remove(kKeyLogFilename);

tests/nexus/test_1_1_8_1_2.cpp

@@ -159,7 +159,7 @@ void Test8_1_2(void)
 
     nexus.AdvanceTime(0);
 
-    Instance::SetLogLevel(kLogLevelNote);
+    SuccessOrQuit(Instance::SetGlobalLogLevel(kLogLevelNote));
 
     // Remove any existing key log file.
     remove(kKeyLogFilename);

tests/nexus/test_1_1_8_1_6.cpp

@@ -154,7 +154,7 @@ void Test1_1_8_1_6(const char *aJsonFileName)
 
     nexus.AdvanceTime(0);
 
-    Instance::SetLogLevel(kLogLevelNote);
+    SuccessOrQuit(Instance::SetGlobalLogLevel(kLogLevelNote));
 
     // Remove any existing key log file.
     remove(kKeyLogFilename);

tests/nexus/test_1_1_8_2_1.cpp

@@ -157,7 +157,7 @@ void Test1_1_8_2_1(const char *aJsonFileName)
 
     nexus.AdvanceTime(0);
 
-    Instance::SetLogLevel(kLogLevelNote);
+    SuccessOrQuit(Instance::SetGlobalLogLevel(kLogLevelNote));
 
     Log("---------------------------------------------------------------------------------------");
     Log("Step 0: All");

tests/nexus/test_1_1_8_2_2.cpp

@@ -157,7 +157,7 @@ void Test8_2_2(const char *aJsonFileName)
 
     nexus.AdvanceTime(0);
 
-    Instance::SetLogLevel(kLogLevelNote);
+    SuccessOrQuit(Instance::SetGlobalLogLevel(kLogLevelNote));
 
 #if OPENTHREAD_CONFIG_MBEDTLS_PROVIDES_SSL_KEY_EXPORT
     remove("test_1_1_8_2_2.keys");

tests/nexus/test_1_1_8_3_1.cpp

@@ -87,7 +87,7 @@ void Test_1_1_8_3_1(void)
 
     nexus.AdvanceTime(0);
 
-    Instance::SetLogLevel(kLogLevelNote);
+    SuccessOrQuit(Instance::SetGlobalLogLevel(kLogLevelNote));
 
     Log("---------------------------------------------------------------------------------------");
     Log("Step 1: All");

tests/nexus/test_1_1_9_2_1.cpp

@@ -99,7 +99,7 @@ void RunTest9_2_1(Topology aTopology, const char *aJsonFile)
 
     nexus.AdvanceTime(0);
 
-    Instance::SetLogLevel(kLogLevelNote);
+    SuccessOrQuit(Instance::SetGlobalLogLevel(kLogLevelNote));
 
     Log("---------------------------------------------------------------------------------------");
     Log("Step 1: All");

tests/nexus/test_1_1_9_2_10.cpp

@@ -170,7 +170,7 @@ void Test9_2_10(void)
 
     nexus.AdvanceTime(0);
 
-    Instance::SetLogLevel(kLogLevelNote);
+    SuccessOrQuit(Instance::SetGlobalLogLevel(kLogLevelNote));
 
     Log("---------------------------------------------------------------------------------------");
     Log("Step 1: All");

tests/nexus/test_1_1_9_2_11.cpp

@@ -167,7 +167,7 @@ void Test9_2_11(void)
 
     nexus.AdvanceTime(0);
 
-    Instance::SetLogLevel(kLogLevelNote);
+    SuccessOrQuit(Instance::SetGlobalLogLevel(kLogLevelNote));
 
     Log("---------------------------------------------------------------------------------------");
     Log("Step 1: All");