code: @Override
      public Map<String,Object> getPerformanceMetrics(AppdynamicsApplication application, String instanceUrl ) {
          Map<String,Object> metrics = new HashMap<>();
  
          metrics.putAll(getOverallMetrics(application, instanceUrl));
          metrics.putAll(getCalculatedMetrics(metrics));
          metrics.putAll(getHealthMetrics(application, instanceUrl));
          metrics.putAll(getViolations(application, instanceUrl));
          metrics.putAll(getSeverityMetrics(application, instanceUrl));
          return metrics;
      }
docs: Obtains the relevant data via different appdynamics api calls.
  
  @param application the current application. Used to provide access to appID/name
  @return List of PerformanceMetrics used to populate the performance database