Cloud Monitor:Exception analysis

What is an exception?

By default, the ARMS agent records an exception only when an instrumented method throws one.

The number of exceptions that ARMS records depends on how they are handled.

• Scenario 1: methodA and methodB each catch and handle their own exceptions.

  In this scenario, ARMS does not record any exceptions.

      public int methodA() {
          try {
              return methodB();
          } catch (Throwable e) {
              e.printStackTrace();
              return 0;
          }
      }
      public int methodB() {
          try {
              return 1 / 0;
          } catch (Throwable e) {
              e.printStackTrace();
              return 0;
          }
      }

• Scenario 2: methodA catches the exception, but methodB throws it.

  In this scenario, ARMS records one java.lang.ArithmeticException.

      public int methodA() {
          try {
              return methodB();
          } catch (Throwable e) {
              e.printStackTrace();
              return 0;
          }
      }
      public int methodB() {
          return 1 / 0;
      }

• Scenario 3: Both methodA and methodB throw their exceptions.

  In this scenario, ARMS records two java.lang.ArithmeticException exceptions.

      public int methodA() {    
          return methodB();
      }
      public int methodB() {
          return 1 / 0;
      }

• Scenario 4: methodB throws an exception, which methodA then wraps and re-throws.

  In this scenario, ARMS records one java.lang.ArithmeticException and one java.lang.RuntimeException.

      public static int methodA() {
          try {
              return methodB();
          } catch (Throwable e) {
              throw new RuntimeException(e);
          }
      }
      public static int methodB() {
          return 1 / 0;
      }

Prerequisites

The application must be connected to Cloud Monitor 2.0.

1. Visit the Playground demo. By default, you are logged on to the o11y-demo-cn-hangzhou workspace.

2. In the left navigation pane, choose Application Center > Application Observability > Application Monitoring.

View in console

1. Log on to the Cloud Monitor 2.0 console, and select a workspace. In the left navigation pane, choose Application Center > Application Observability > Application Insights.

2. On the Applications page, click an application. Then, choose Scenario Analysis > Exception Analysis.

   • In the Quick Filter section, filter exceptions by exception name, interface name, application, and instance.

   • The trend charts show exception counts over a specified time period, with bars stacked by exception name.

   • The exception list shows the interface name, exception count, proportion, and exception summary.

     In the Actions column, you can:

     • Click Overview to view the exception count trend, distribution by interface and instance, and exception stack.

     • Click Traces to view trace details.