message: [Key Manager] Add metrics for the errors encountered by the key manager.
  Closes:
diff: @@ -150,12 +150,14 @@ where
  error!(LogSchema::new(LogEntry::CheckKeyStatus)
  .event(LogEvent::Error)
  .liveness_error(&error));
  + counters::increment_state("check_keys", "liveness_error_encountered");
  }
  Err(e) => {
  // Log the unexpected error and continue to execute.
  error!(LogSchema::new(LogEntry::CheckKeyStatus)
  .event(LogEvent::Error)
  .unexpected_error(&e));
  + counters::increment_state("check_keys", "unexpected_error_encountered");
  }
  };
  