Merge pull request #22912 from Random-Liu/kubelet-perf

Automatic merge from submit-queue

Add generalized performance data type in e2e test

For kubernetes/contrib/issues/564 and #15554.

This PR added two files in e2e test:
1) `perftype/perftype.go`: This file contains generalized performance data type. The type can be pretty printed in Json format and analyzed by other performance analyzing tools, such as [Perfdash](https://github.com/kubernetes/contrib/tree/master/perfdash).
2) `perf_util.go`: This file contains functions which convert e2e performance test result into new performance data type.

The new performance data type is now used in *Density test, Load test and Kubelet resource tracking*. It's easy to support other e2e performance test by adding new convert function in `perf_util.go`.

@gmarek @yujuhong 
/cc @kubernetes/sig-testing

test/e2e/framework/metrics_util.go

@@ -287,7 +287,10 @@ func HighLatencyRequests(c *client.Client) (int, error) {
 		}
 	}
 
+	// TODO(random-liu): Remove the log when we migrate to new perfdash
 	Logf("API calls latencies: %s", PrettyPrintJSON(metrics))
+	// Log perf data
+	PrintPerfData(ApiCallToPerfData(metrics))
 
 	return badMetrics, nil
 }