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metrics.go
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metrics.go
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package metrics
import (
"context"
"errors"
"fmt"
"net/http"
"os"
"regexp"
"strconv"
"time"
"github.com/argoproj/gitops-engine/pkg/health"
"github.com/prometheus/client_golang/prometheus"
"github.com/prometheus/client_golang/prometheus/promhttp"
"github.com/robfig/cron"
log "github.com/sirupsen/logrus"
"k8s.io/apimachinery/pkg/labels"
argoappv1 "github.com/argoproj/argo-cd/v2/pkg/apis/application/v1alpha1"
applister "github.com/argoproj/argo-cd/v2/pkg/client/listers/application/v1alpha1"
"github.com/argoproj/argo-cd/v2/util/git"
"github.com/argoproj/argo-cd/v2/util/healthz"
"github.com/argoproj/argo-cd/v2/util/profile"
)
type MetricsServer struct {
*http.Server
syncCounter *prometheus.CounterVec
kubectlExecCounter *prometheus.CounterVec
kubectlExecPendingGauge *prometheus.GaugeVec
k8sRequestCounter *prometheus.CounterVec
clusterEventsCounter *prometheus.CounterVec
redisRequestCounter *prometheus.CounterVec
reconcileHistogram *prometheus.HistogramVec
redisRequestHistogram *prometheus.HistogramVec
registry *prometheus.Registry
hostname string
cron *cron.Cron
}
const (
// MetricsPath is the endpoint to collect application metrics
MetricsPath = "/metrics"
// EnvVarLegacyControllerMetrics is a env var to re-enable deprecated prometheus metrics
EnvVarLegacyControllerMetrics = "ARGOCD_LEGACY_CONTROLLER_METRICS"
)
// Follow Prometheus naming practices
// https://prometheus.io/docs/practices/naming/
var (
descAppDefaultLabels = []string{"namespace", "name", "project"}
descAppLabels *prometheus.Desc
descAppInfo = prometheus.NewDesc(
"argocd_app_info",
"Information about application.",
append(descAppDefaultLabels, "repo", "dest_server", "dest_namespace", "sync_status", "health_status", "operation"),
nil,
)
// DEPRECATED
descAppCreated = prometheus.NewDesc(
"argocd_app_created_time",
"Creation time in unix timestamp for an application.",
descAppDefaultLabels,
nil,
)
// DEPRECATED: superseded by sync_status label in argocd_app_info
descAppSyncStatusCode = prometheus.NewDesc(
"argocd_app_sync_status",
"The application current sync status.",
append(descAppDefaultLabels, "sync_status"),
nil,
)
// DEPRECATED: superseded by health_status label in argocd_app_info
descAppHealthStatus = prometheus.NewDesc(
"argocd_app_health_status",
"The application current health status.",
append(descAppDefaultLabels, "health_status"),
nil,
)
syncCounter = prometheus.NewCounterVec(
prometheus.CounterOpts{
Name: "argocd_app_sync_total",
Help: "Number of application syncs.",
},
append(descAppDefaultLabels, "dest_server", "phase"),
)
k8sRequestCounter = prometheus.NewCounterVec(
prometheus.CounterOpts{
Name: "argocd_app_k8s_request_total",
Help: "Number of kubernetes requests executed during application reconciliation.",
},
append(descAppDefaultLabels, "server", "response_code", "verb", "resource_kind", "resource_namespace"),
)
kubectlExecCounter = prometheus.NewCounterVec(prometheus.CounterOpts{
Name: "argocd_kubectl_exec_total",
Help: "Number of kubectl executions",
}, []string{"hostname", "command"})
kubectlExecPendingGauge = prometheus.NewGaugeVec(prometheus.GaugeOpts{
Name: "argocd_kubectl_exec_pending",
Help: "Number of pending kubectl executions",
}, []string{"hostname", "command"})
reconcileHistogram = prometheus.NewHistogramVec(
prometheus.HistogramOpts{
Name: "argocd_app_reconcile",
Help: "Application reconciliation performance.",
// Buckets chosen after observing a ~2100ms mean reconcile time
Buckets: []float64{0.25, .5, 1, 2, 4, 8, 16},
},
[]string{"namespace", "dest_server"},
)
clusterEventsCounter = prometheus.NewCounterVec(prometheus.CounterOpts{
Name: "argocd_cluster_events_total",
Help: "Number of processes k8s resource events.",
}, append(descClusterDefaultLabels, "group", "kind"))
redisRequestCounter = prometheus.NewCounterVec(
prometheus.CounterOpts{
Name: "argocd_redis_request_total",
Help: "Number of redis requests executed during application reconciliation.",
},
[]string{"hostname", "initiator", "failed"},
)
redisRequestHistogram = prometheus.NewHistogramVec(
prometheus.HistogramOpts{
Name: "argocd_redis_request_duration",
Help: "Redis requests duration.",
Buckets: []float64{0.01, 0.05, 0.10, 0.25, .5, 1},
},
[]string{"hostname", "initiator"},
)
)
// NewMetricsServer returns a new prometheus server which collects application metrics
func NewMetricsServer(addr string, appLister applister.ApplicationLister, appFilter func(obj interface{}) bool, healthCheck func(r *http.Request) error, appLabels []string) (*MetricsServer, error) {
hostname, err := os.Hostname()
if err != nil {
return nil, err
}
if len(appLabels) > 0 {
normalizedLabels := normalizeLabels("label", appLabels)
descAppLabels = prometheus.NewDesc(
"argocd_app_labels",
"Argo Application labels converted to Prometheus labels",
append(descAppDefaultLabels, normalizedLabels...),
nil,
)
}
mux := http.NewServeMux()
registry := NewAppRegistry(appLister, appFilter, appLabels)
registry.MustRegister(depth, adds, latency, workDuration, unfinished, longestRunningProcessor, retries)
mux.Handle(MetricsPath, promhttp.HandlerFor(prometheus.Gatherers{
// contains app controller specific metrics
registry,
// contains process, golang and controller workqueues metrics
prometheus.DefaultGatherer,
}, promhttp.HandlerOpts{}))
profile.RegisterProfiler(mux)
healthz.ServeHealthCheck(mux, healthCheck)
registry.MustRegister(syncCounter)
registry.MustRegister(k8sRequestCounter)
registry.MustRegister(kubectlExecCounter)
registry.MustRegister(kubectlExecPendingGauge)
registry.MustRegister(reconcileHistogram)
registry.MustRegister(clusterEventsCounter)
registry.MustRegister(redisRequestCounter)
registry.MustRegister(redisRequestHistogram)
return &MetricsServer{
registry: registry,
Server: &http.Server{
Addr: addr,
Handler: mux,
},
syncCounter: syncCounter,
k8sRequestCounter: k8sRequestCounter,
kubectlExecCounter: kubectlExecCounter,
kubectlExecPendingGauge: kubectlExecPendingGauge,
reconcileHistogram: reconcileHistogram,
clusterEventsCounter: clusterEventsCounter,
redisRequestCounter: redisRequestCounter,
redisRequestHistogram: redisRequestHistogram,
hostname: hostname,
cron: cron.New(),
}, nil
}
// Prometheus invalid labels, more info: https://prometheus.io/docs/concepts/data_model/#metric-names-and-labels.
var invalidPromLabelChars = regexp.MustCompile(`[^a-zA-Z0-9_]`)
func normalizeLabels(prefix string, appLabels []string) []string {
results := []string{}
for _, label := range appLabels {
//prometheus labels don't accept dash in their name
curr := invalidPromLabelChars.ReplaceAllString(label, "_")
result := fmt.Sprintf("%s_%s", prefix, curr)
results = append(results, result)
}
return results
}
func (m *MetricsServer) RegisterClustersInfoSource(ctx context.Context, source HasClustersInfo) {
collector := &clusterCollector{infoSource: source}
go collector.Run(ctx)
m.registry.MustRegister(collector)
}
// IncSync increments the sync counter for an application
func (m *MetricsServer) IncSync(app *argoappv1.Application, state *argoappv1.OperationState) {
if !state.Phase.Completed() {
return
}
m.syncCounter.WithLabelValues(app.Namespace, app.Name, app.Spec.GetProject(), app.Spec.Destination.Server, string(state.Phase)).Inc()
}
func (m *MetricsServer) IncKubectlExec(command string) {
m.kubectlExecCounter.WithLabelValues(m.hostname, command).Inc()
}
func (m *MetricsServer) IncKubectlExecPending(command string) {
m.kubectlExecPendingGauge.WithLabelValues(m.hostname, command).Inc()
}
func (m *MetricsServer) DecKubectlExecPending(command string) {
m.kubectlExecPendingGauge.WithLabelValues(m.hostname, command).Dec()
}
// IncClusterEventsCount increments the number of cluster events
func (m *MetricsServer) IncClusterEventsCount(server, group, kind string) {
m.clusterEventsCounter.WithLabelValues(server, group, kind).Inc()
}
// IncKubernetesRequest increments the kubernetes requests counter for an application
func (m *MetricsServer) IncKubernetesRequest(app *argoappv1.Application, server, statusCode, verb, resourceKind, resourceNamespace string) {
var namespace, name, project string
if app != nil {
namespace = app.Namespace
name = app.Name
project = app.Spec.GetProject()
}
m.k8sRequestCounter.WithLabelValues(
namespace, name, project, server, statusCode,
verb, resourceKind, resourceNamespace,
).Inc()
}
func (m *MetricsServer) IncRedisRequest(failed bool) {
m.redisRequestCounter.WithLabelValues(m.hostname, "argocd-application-controller", strconv.FormatBool(failed)).Inc()
}
// ObserveRedisRequestDuration observes redis request duration
func (m *MetricsServer) ObserveRedisRequestDuration(duration time.Duration) {
m.redisRequestHistogram.WithLabelValues(m.hostname, "argocd-application-controller").Observe(duration.Seconds())
}
// IncReconcile increments the reconcile counter for an application
func (m *MetricsServer) IncReconcile(app *argoappv1.Application, duration time.Duration) {
m.reconcileHistogram.WithLabelValues(app.Namespace, app.Spec.Destination.Server).Observe(duration.Seconds())
}
// HasExpiration return true if expiration is set
func (m *MetricsServer) HasExpiration() bool {
return len(m.cron.Entries()) > 0
}
// SetExpiration reset Prometheus metrics based on time duration interval
func (m *MetricsServer) SetExpiration(cacheExpiration time.Duration) error {
if m.HasExpiration() {
return errors.New("Expiration is already set")
}
err := m.cron.AddFunc(fmt.Sprintf("@every %s", cacheExpiration), func() {
log.Infof("Reset Prometheus metrics based on existing expiration '%v'", cacheExpiration)
m.syncCounter.Reset()
m.kubectlExecCounter.Reset()
m.kubectlExecPendingGauge.Reset()
m.k8sRequestCounter.Reset()
m.clusterEventsCounter.Reset()
m.redisRequestCounter.Reset()
m.reconcileHistogram.Reset()
m.redisRequestHistogram.Reset()
})
if err != nil {
return err
}
m.cron.Start()
return nil
}
type appCollector struct {
store applister.ApplicationLister
appFilter func(obj interface{}) bool
appLabels []string
}
// NewAppCollector returns a prometheus collector for application metrics
func NewAppCollector(appLister applister.ApplicationLister, appFilter func(obj interface{}) bool, appLabels []string) prometheus.Collector {
return &appCollector{
store: appLister,
appFilter: appFilter,
appLabels: appLabels,
}
}
// NewAppRegistry creates a new prometheus registry that collects applications
func NewAppRegistry(appLister applister.ApplicationLister, appFilter func(obj interface{}) bool, appLabels []string) *prometheus.Registry {
registry := prometheus.NewRegistry()
registry.MustRegister(NewAppCollector(appLister, appFilter, appLabels))
return registry
}
// Describe implements the prometheus.Collector interface
func (c *appCollector) Describe(ch chan<- *prometheus.Desc) {
if len(c.appLabels) > 0 {
ch <- descAppLabels
}
ch <- descAppInfo
ch <- descAppSyncStatusCode
ch <- descAppHealthStatus
}
// Collect implements the prometheus.Collector interface
func (c *appCollector) Collect(ch chan<- prometheus.Metric) {
apps, err := c.store.List(labels.NewSelector())
if err != nil {
log.Warnf("Failed to collect applications: %v", err)
return
}
for _, app := range apps {
if c.appFilter(app) {
c.collectApps(ch, app)
}
}
}
func boolFloat64(b bool) float64 {
if b {
return 1
}
return 0
}
func (c *appCollector) collectApps(ch chan<- prometheus.Metric, app *argoappv1.Application) {
addConstMetric := func(desc *prometheus.Desc, t prometheus.ValueType, v float64, lv ...string) {
project := app.Spec.GetProject()
lv = append([]string{app.Namespace, app.Name, project}, lv...)
ch <- prometheus.MustNewConstMetric(desc, t, v, lv...)
}
addGauge := func(desc *prometheus.Desc, v float64, lv ...string) {
addConstMetric(desc, prometheus.GaugeValue, v, lv...)
}
var operation string
if app.DeletionTimestamp != nil {
operation = "delete"
} else if app.Operation != nil && app.Operation.Sync != nil {
operation = "sync"
}
syncStatus := app.Status.Sync.Status
if syncStatus == "" {
syncStatus = argoappv1.SyncStatusCodeUnknown
}
healthStatus := app.Status.Health.Status
if healthStatus == "" {
healthStatus = health.HealthStatusUnknown
}
addGauge(descAppInfo, 1, git.NormalizeGitURL(app.Spec.Source.RepoURL), app.Spec.Destination.Server, app.Spec.Destination.Namespace, string(syncStatus), string(healthStatus), operation)
if len(c.appLabels) > 0 {
labelValues := []string{}
for _, desiredLabel := range c.appLabels {
value := app.GetLabels()[desiredLabel]
labelValues = append(labelValues, value)
}
addGauge(descAppLabels, 1, labelValues...)
}
// Deprecated controller metrics
if os.Getenv(EnvVarLegacyControllerMetrics) == "true" {
addGauge(descAppCreated, float64(app.CreationTimestamp.Unix()))
addGauge(descAppSyncStatusCode, boolFloat64(syncStatus == argoappv1.SyncStatusCodeSynced), string(argoappv1.SyncStatusCodeSynced))
addGauge(descAppSyncStatusCode, boolFloat64(syncStatus == argoappv1.SyncStatusCodeOutOfSync), string(argoappv1.SyncStatusCodeOutOfSync))
addGauge(descAppSyncStatusCode, boolFloat64(syncStatus == argoappv1.SyncStatusCodeUnknown || syncStatus == ""), string(argoappv1.SyncStatusCodeUnknown))
healthStatus := app.Status.Health.Status
addGauge(descAppHealthStatus, boolFloat64(healthStatus == health.HealthStatusUnknown || healthStatus == ""), string(health.HealthStatusUnknown))
addGauge(descAppHealthStatus, boolFloat64(healthStatus == health.HealthStatusProgressing), string(health.HealthStatusProgressing))
addGauge(descAppHealthStatus, boolFloat64(healthStatus == health.HealthStatusSuspended), string(health.HealthStatusSuspended))
addGauge(descAppHealthStatus, boolFloat64(healthStatus == health.HealthStatusHealthy), string(health.HealthStatusHealthy))
addGauge(descAppHealthStatus, boolFloat64(healthStatus == health.HealthStatusDegraded), string(health.HealthStatusDegraded))
addGauge(descAppHealthStatus, boolFloat64(healthStatus == health.HealthStatusMissing), string(health.HealthStatusMissing))
}
}