StatsdBeforeAfterGaugeMetricPostProcessor

public class StatsdBeforeAfterGaugeMetricPostProcessor
extends StatsdGenericPostProcessor

A post processor that processes gauge metrics collected in a "before/after" approach, i.e. one snapshot before a test/run and one after, pulling out metrics according to a supplied list of metric formatters and reporting their deltas.

Metrics collected this way look like the following: (metrics reside in the atoms)

 reports {
   metrics {
     gauge_metrics {
       data {
         # Bucket for the "before" snapshot
         bucket_info {
           atom {...}
           atom {...}
           ...
         }
         # Bucket for the "after" snapshot
         bucket_info {
           atom {...}
           atom {...}
           ...
         }
       }
     }
     ...
   }
   ...
 }
 

As an example, if the supplied metric formatter is on_device_power_measurement for key and [subsystem_name]-[rail_name]=[energy_microwatt_secs] for value, the metric for an atom where subsystem_name is display, rail_name is RAIL_NAME and energy_microwatt_secs is 10 will look like statsd-<config name>-gauge-on_device_power_measurement-delta-display-RAIL_NAME=10.

The before/after metrics are matched for delta calculation by their name, so it is assumed that the formatters will ensure that each snapshot generates unique metric sets within them. The processor will generate warnings in these scenarios:

• There are duplicate metric keys generated by the formatters within each snapshot
• An atom or metric key is present in one snapshot but not the other

Summary

Public constructors

public StatsdBeforeAfterGaugeMetricPostProcessor ()

Protected methods

protected void logFormattedWarning (String message)

protected  parseMetricsFromReportList (StatsLog.ConfigMetricsReportList reportList)