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feat: integrate prometheus metrics handler and expose basic metrics (#…
…226) * feat: integrate prometheus metrics handler and expose basic metrics * fix obsolete metric record * fix lint * improve prometheus metrics recording * fix lint * small optimization
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,26 @@ | ||
| package main | ||
|
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| import ( | ||
| "fmt" | ||
| "net/http" | ||
|
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| "github.com/prometheus/client_golang/prometheus/promhttp" | ||
| "k8s.io/klog/v2" | ||
| ) | ||
|
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| const ( | ||
| prometheusMetricsPath = "/metrics" | ||
| prometheusMetricsPort = 8000 | ||
| ) | ||
|
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| func init() { | ||
| go initPrometheusMetrics() | ||
| } | ||
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| func initPrometheusMetrics() { | ||
| http.Handle(prometheusMetricsPath, promhttp.Handler()) | ||
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| if err := http.ListenAndServe(fmt.Sprintf(":%d", prometheusMetricsPort), nil); err != nil { | ||
| klog.Fatal(err) | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,73 @@ | ||
| package metrics | ||
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| import ( | ||
| "github.com/prometheus/client_golang/prometheus" | ||
| "github.com/prometheus/client_golang/prometheus/promauto" | ||
| ) | ||
|
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| var ( | ||
| recorder = (&prometheusRecorder{}).init() | ||
| ) | ||
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| type prometheusRecorder struct { | ||
| discoveryAPICacheRefreshCounter prometheus.Counter | ||
| discoveryAPICacheRefreshErrorCounter prometheus.Counter | ||
| serviceReconciliationCounter *prometheus.CounterVec | ||
| serviceReconciliationErrorCounter *prometheus.CounterVec | ||
| stackRunJobsCreatedCounter prometheus.Counter | ||
| } | ||
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| func (in *prometheusRecorder) DiscoveryAPICacheRefresh(err error) { | ||
| if err != nil { | ||
| in.discoveryAPICacheRefreshErrorCounter.Inc() | ||
| return | ||
| } | ||
|
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| in.discoveryAPICacheRefreshCounter.Inc() | ||
| } | ||
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| func (in *prometheusRecorder) ServiceReconciliation(serviceID, serviceName string, err error) { | ||
| if err != nil { | ||
| in.serviceReconciliationErrorCounter.WithLabelValues(serviceID, serviceName).Inc() | ||
| return | ||
| } | ||
|
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| in.serviceReconciliationCounter.WithLabelValues(serviceID, serviceName).Inc() | ||
| } | ||
|
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| func (in *prometheusRecorder) StackRunJobCreation() { | ||
| in.stackRunJobsCreatedCounter.Inc() | ||
| } | ||
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| func (in *prometheusRecorder) init() Recorder { | ||
| in.discoveryAPICacheRefreshCounter = promauto.NewCounter(prometheus.CounterOpts{ | ||
| Name: DiscoveryAPICacheRefreshMetricName, | ||
| Help: DiscoveryAPICacheRefreshMetricDescription, | ||
| }) | ||
|
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| in.discoveryAPICacheRefreshErrorCounter = promauto.NewCounter(prometheus.CounterOpts{ | ||
| Name: DiscoveryAPICacheRefreshErrorMetricName, | ||
| Help: DiscoveryAPICacheRefreshErrorMetricDescription, | ||
| }) | ||
|
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| in.serviceReconciliationCounter = promauto.NewCounterVec(prometheus.CounterOpts{ | ||
| Name: ServiceReconciliationMetricName, | ||
| Help: ServiceReconciliationMetricDescription, | ||
| }, []string{ServiceReconciliationMetricLabelServiceID, ServiceReconciliationMetricLabelServiceName}) | ||
|
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| in.serviceReconciliationErrorCounter = promauto.NewCounterVec(prometheus.CounterOpts{ | ||
| Name: ServiceReconciliationErrorMetricName, | ||
| Help: ServiceReconciliationErrorMetricDescription, | ||
| }, []string{ServiceReconciliationMetricLabelServiceID, ServiceReconciliationMetricLabelServiceName}) | ||
|
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| in.stackRunJobsCreatedCounter = promauto.NewCounter(prometheus.CounterOpts{ | ||
| Name: StackRunJobsCreatedMetricName, | ||
| Help: StackRunJobsCreatedMetricDescription, | ||
| }) | ||
|
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| return in | ||
| } | ||
|
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| func Record() Recorder { | ||
| return recorder | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,27 @@ | ||
| package metrics | ||
|
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| const ( | ||
| DiscoveryAPICacheRefreshMetricName = "agent_discoveryapi_cache_refresh_total" | ||
| DiscoveryAPICacheRefreshMetricDescription = "The total number of Discovery API cache refresh attempts" | ||
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| DiscoveryAPICacheRefreshErrorMetricName = "agent_discoveryapi_cache_refresh_error_total" | ||
| DiscoveryAPICacheRefreshErrorMetricDescription = "The total number of Discovery API cache refresh errors" | ||
|
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| ServiceReconciliationMetricName = "agent_service_reconciliations_total" | ||
| ServiceReconciliationMetricDescription = "The total number of service reconciliations" | ||
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| ServiceReconciliationErrorMetricName = "agent_service_reconciliation_errors_total" | ||
| ServiceReconciliationErrorMetricDescription = "The total number of service reconciliation errors" | ||
|
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| ServiceReconciliationMetricLabelServiceID = "service_id" | ||
| ServiceReconciliationMetricLabelServiceName = "service_name" | ||
|
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| StackRunJobsCreatedMetricName = "agent_stack_runs_created_total" | ||
| StackRunJobsCreatedMetricDescription = "The total number of created stack runs" | ||
| ) | ||
|
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| type Recorder interface { | ||
| DiscoveryAPICacheRefresh(err error) | ||
| ServiceReconciliation(serviceID, serviceName string, err error) | ||
| StackRunJobCreation() | ||
| } |
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