feat(gax): implement actionable errors logging in ApiTracer framework

Author: westarle

gax-java/gax/src/main/java/com/google/api/gax/rpc/ClientContext.java

@@ -281,13 +281,11 @@ public static ClientContext create(StubSettings settings) throws IOException {
     if (apiTracerFactory instanceof SpanTracerFactory) {
       apiTracerFactory = apiTracerFactory.withContext(apiTracerContext);
     }
-    if (com.google.api.gax.logging.LoggingUtils.isLoggingV2Enabled()) {
-      com.google.api.gax.tracing.ApiTracerFactory loggingTracerFactory =
-          new com.google.api.gax.tracing.LoggingTracerFactory().withContext(apiTracerContext);
-      apiTracerFactory =
-          new com.google.api.gax.tracing.CompositeTracerFactory(
-              apiTracerFactory, loggingTracerFactory);
-    }
+    com.google.api.gax.tracing.ApiTracerFactory loggingTracerFactory =
+        new com.google.api.gax.tracing.LoggingTracerFactory().withContext(apiTracerContext);
+    apiTracerFactory =
+        new com.google.api.gax.tracing.CompositeTracerFactory(
+            apiTracerFactory, loggingTracerFactory);
 
     return newBuilder()
         .setBackgroundResources(backgroundResources.build())

gax-java/gax/src/main/java/com/google/api/gax/tracing/LoggingTracer.java

@@ -118,6 +118,6 @@ private void recordActionableError(Throwable error) {
 
     String message = error.getMessage() != null ? error.getMessage() : error.getClass().getName();
     LoggingUtils.logActionableError(
-        logContext, LOGGER_PROVIDER, org.slf4j.event.Level.INFO, message);
+        logContext, LOGGER_PROVIDER, org.slf4j.event.Level.DEBUG, message);
   }
 }