[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.

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");

tests/nexus/test_1_1_9_2_12.cpp

@@ -122,7 +122,7 @@ void Test9_2_12(void)
 
     nexus.AdvanceTime(0);
 
-    Instance::SetLogLevel(kLogLevelNote);
+    SuccessOrQuit(Instance::SetGlobalLogLevel(kLogLevelNote));
 
     /** Use AllowList feature to specify links between nodes. */
     leader2.AllowList(med1);

tests/nexus/test_1_1_9_2_13.cpp

@@ -152,7 +152,7 @@ void Test9_2_13(void)
 
     nexus.AdvanceTime(0);
 
-    Instance::SetLogLevel(kLogLevelNote);
+    SuccessOrQuit(Instance::SetGlobalLogLevel(kLogLevelNote));
 
     Log("Step 1: Form topology and start a constant ICMPv6 Echo Request from Leader_2 to SED_2.");
 

tests/nexus/test_1_1_9_2_14.cpp

@@ -106,7 +106,7 @@ void Test9_2_14(void)
 
     nexus.AdvanceTime(0);
 
-    Instance::SetLogLevel(kLogLevelNote);
+    SuccessOrQuit(Instance::SetGlobalLogLevel(kLogLevelNote));
 
     Log("---------------------------------------------------------------------------------------");
     Log("Step 1: All");

tests/nexus/test_1_1_9_2_15.cpp

@@ -203,7 +203,7 @@ void Test9_2_15(void)
 
     nexus.AdvanceTime(0);
 
-    Instance::SetLogLevel(kLogLevelNote);
+    SuccessOrQuit(Instance::SetGlobalLogLevel(kLogLevelNote));
 
     Log("---------------------------------------------------------------------------------------");
     Log("Step 1: Commissioner, Leader, Router_1");

tests/nexus/test_1_1_9_2_16.cpp

@@ -189,7 +189,7 @@ void Test9_2_16(void)
 
     nexus.AdvanceTime(0);
 
-    Instance::SetLogLevel(kLogLevelNote);
+    SuccessOrQuit(Instance::SetGlobalLogLevel(kLogLevelNote));
 
     Log("---------------------------------------------------------------------------------------");
     Log("Step 1: Commissioner, Leader, Router_1");

tests/nexus/test_1_1_9_2_17.cpp

@@ -140,7 +140,7 @@ void Test9_2_17(void)
 
     nexus.AdvanceTime(0);
 
-    Instance::SetLogLevel(kLogLevelNote);
+    SuccessOrQuit(Instance::SetGlobalLogLevel(kLogLevelNote));
 
     Log("---------------------------------------------------------------------------------------");
     Log("Step 1: All");

tests/nexus/test_1_1_9_2_18.cpp

@@ -142,7 +142,7 @@ void Test9_2_18(void)
 
     nexus.AdvanceTime(0);
 
-    Instance::SetLogLevel(kLogLevelNote);
+    SuccessOrQuit(Instance::SetGlobalLogLevel(kLogLevelNote));
 
     Log("---------------------------------------------------------------------------------------");
     Log("Step 1: All");

tests/nexus/test_1_1_9_2_19.cpp

@@ -120,7 +120,7 @@ void RunTest9_2_19(Topology aTopology, const char *aJsonFile)
 
     nexus.AdvanceTime(0);
 
-    Instance::SetLogLevel(kLogLevelNote);
+    SuccessOrQuit(Instance::SetGlobalLogLevel(kLogLevelNote));
 
     /**
      * Step 1: All

tests/nexus/test_1_1_9_2_2.cpp

@@ -99,7 +99,7 @@ void Test9_2_2(void)
 
     nexus.AdvanceTime(0);
 
-    Instance::SetLogLevel(kLogLevelNote);
+    SuccessOrQuit(Instance::SetGlobalLogLevel(kLogLevelNote));
 
     /**
      * Step 1: All

tests/nexus/test_1_1_9_2_3.cpp

@@ -101,7 +101,7 @@ void RunTest9_2_3(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_4.cpp

@@ -261,7 +261,7 @@ void RunTest9_2_4(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_5.cpp

@@ -113,7 +113,7 @@ void Test9_2_5(void)
 
     nexus.AdvanceTime(0);
 
-    Instance::SetLogLevel(kLogLevelNote);
+    SuccessOrQuit(Instance::SetGlobalLogLevel(kLogLevelNote));
 
     Log("---------------------------------------------------------------------------------------");
     Log("Step 1: All");