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Merge pull request #6941 from a-robinson/metrics
Add an integration test that checks for the metrics we expect to be exported from the master
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,126 @@ | ||
| // +build integration,!no-etcd | ||
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| /* | ||
| Copyright 2015 Google Inc. All rights reserved. | ||
| Licensed under the Apache License, Version 2.0 (the "License"); | ||
| you may not use this file except in compliance with the License. | ||
| You may obtain a copy of the License at | ||
| http://www.apache.org/licenses/LICENSE-2.0 | ||
| Unless required by applicable law or agreed to in writing, software | ||
| distributed under the License is distributed on an "AS IS" BASIS, | ||
| WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| See the License for the specific language governing permissions and | ||
| limitations under the License. | ||
| */ | ||
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| package integration | ||
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| import ( | ||
| "bufio" | ||
| "fmt" | ||
| "net/http" | ||
| "net/http/httptest" | ||
| "testing" | ||
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| "github.com/GoogleCloudPlatform/kubernetes/pkg/api" | ||
| "github.com/GoogleCloudPlatform/kubernetes/pkg/api/testapi" | ||
| "github.com/GoogleCloudPlatform/kubernetes/pkg/client" | ||
| "github.com/GoogleCloudPlatform/kubernetes/pkg/labels" | ||
| "github.com/golang/glog" | ||
| "github.com/golang/protobuf/proto" | ||
| prometheuspb "github.com/prometheus/client_model/go" | ||
| ) | ||
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| const scrapeRequestHeader = "application/vnd.google.protobuf;proto=io.prometheus.client.MetricFamily;encoding=compact-text" | ||
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| func init() { | ||
| requireEtcd() | ||
| } | ||
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| func scrapeMetrics(s *httptest.Server) ([]*prometheuspb.MetricFamily, error) { | ||
| req, err := http.NewRequest("GET", s.URL+"/metrics", nil) | ||
| if err != nil { | ||
| return nil, fmt.Errorf("Unable to create http request: %v", err) | ||
| } | ||
| // Ask the prometheus exporter for its text protocol buffer format, since it's | ||
| // much easier to parse than its plain-text format. Don't use the serialized | ||
| // proto representation since it uses a non-standard varint delimiter between | ||
| // metric families. | ||
| req.Header.Add("Accept", scrapeRequestHeader) | ||
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| client := &http.Client{} | ||
| resp, err := client.Do(req) | ||
| if err != nil { | ||
| return nil, fmt.Errorf("Unable to contact metrics endpoint of master: %v", err) | ||
| } | ||
| defer resp.Body.Close() | ||
| if resp.StatusCode != 200 { | ||
| return nil, fmt.Errorf("Non-200 response trying to scrape metrics from master: %v", resp) | ||
| } | ||
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| // Each line in the response body should contain all the data for a single metric. | ||
| var metrics []*prometheuspb.MetricFamily | ||
| scanner := bufio.NewScanner(resp.Body) | ||
| for scanner.Scan() { | ||
| var metric prometheuspb.MetricFamily | ||
| if err := proto.UnmarshalText(scanner.Text(), &metric); err != nil { | ||
| return nil, fmt.Errorf("Failed to unmarshal line of metrics response: %v", err) | ||
| } | ||
| glog.Infof("Got metric %q", metric.GetName()) | ||
| metrics = append(metrics, &metric) | ||
| } | ||
| return metrics, nil | ||
| } | ||
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| func checkForExpectedMetrics(t *testing.T, metrics []*prometheuspb.MetricFamily, expectedMetrics []string) { | ||
| foundMetrics := make(map[string]bool) | ||
| for _, metric := range metrics { | ||
| foundMetrics[metric.GetName()] = true | ||
| } | ||
| for _, expected := range expectedMetrics { | ||
| if _, found := foundMetrics[expected]; !found { | ||
| t.Errorf("Master metrics did not include expected metric %q", expected) | ||
| } | ||
| } | ||
| } | ||
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| func TestMasterProcessMetrics(t *testing.T) { | ||
| _, s := runAMaster(t) | ||
| defer s.Close() | ||
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| metrics, err := scrapeMetrics(s) | ||
| if err != nil { | ||
| t.Fatal(err) | ||
| } | ||
| checkForExpectedMetrics(t, metrics, []string{ | ||
| "process_start_time_seconds", | ||
| "process_cpu_seconds_total", | ||
| "process_goroutines", | ||
| "process_open_fds", | ||
| "process_resident_memory_bytes", | ||
| }) | ||
| } | ||
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| func TestApiserverMetrics(t *testing.T) { | ||
| _, s := runAMaster(t) | ||
| defer s.Close() | ||
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| // Make a request to the apiserver to ensure there's at least one data point | ||
| // for the metrics we're expecting -- otherwise, they won't be exported. | ||
| client := client.NewOrDie(&client.Config{Host: s.URL, Version: testapi.Version()}) | ||
| if _, err := client.Pods(api.NamespaceDefault).List(labels.Everything()); err != nil { | ||
| t.Fatalf("unexpected error getting pods: %v", err) | ||
| } | ||
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| metrics, err := scrapeMetrics(s) | ||
| if err != nil { | ||
| t.Fatal(err) | ||
| } | ||
| checkForExpectedMetrics(t, metrics, []string{ | ||
| "apiserver_request_count", | ||
| "apiserver_request_latencies", | ||
| }) | ||
| } |
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