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clustercollector.go
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clustercollector.go
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package metrics
import (
"context"
"sync"
"time"
"github.com/argoproj/gitops-engine/pkg/cache"
"github.com/prometheus/client_golang/prometheus"
)
const (
metricsCollectionInterval = 30 * time.Second
)
var (
descClusterDefaultLabels = []string{"server"}
descClusterInfo = prometheus.NewDesc(
"argocd_cluster_info",
"Information about cluster.",
append(descClusterDefaultLabels, "k8s_version"),
nil,
)
descClusterCacheResources = prometheus.NewDesc(
"argocd_cluster_api_resource_objects",
"Number of k8s resource objects in the cache.",
descClusterDefaultLabels,
nil,
)
descClusterAPIs = prometheus.NewDesc(
"argocd_cluster_api_resources",
"Number of monitored kubernetes API resources.",
descClusterDefaultLabels,
nil,
)
descClusterCacheAgeSeconds = prometheus.NewDesc(
"argocd_cluster_cache_age_seconds",
"Cluster cache age in seconds.",
descClusterDefaultLabels,
nil,
)
descClusterConnectionStatus = prometheus.NewDesc(
"argocd_cluster_connection_status",
"The k8s cluster current connection status.",
append(descClusterDefaultLabels, "k8s_version"),
nil,
)
)
type HasClustersInfo interface {
GetClustersInfo() []cache.ClusterInfo
}
type clusterCollector struct {
infoSource HasClustersInfo
info []cache.ClusterInfo
lock sync.Mutex
}
func (c *clusterCollector) Run(ctx context.Context) {
// FIXME: complains about SA1015
// nolint:staticcheck
tick := time.Tick(metricsCollectionInterval)
for {
select {
case <-ctx.Done():
break
case <-tick:
info := c.infoSource.GetClustersInfo()
c.lock.Lock()
c.info = info
c.lock.Unlock()
}
}
}
// Describe implements the prometheus.Collector interface
func (c *clusterCollector) Describe(ch chan<- *prometheus.Desc) {
ch <- descClusterInfo
ch <- descClusterCacheResources
ch <- descClusterAPIs
ch <- descClusterCacheAgeSeconds
ch <- descClusterConnectionStatus
}
func (c *clusterCollector) Collect(ch chan<- prometheus.Metric) {
now := time.Now()
for _, c := range c.info {
defaultValues := []string{c.Server}
ch <- prometheus.MustNewConstMetric(descClusterInfo, prometheus.GaugeValue, 1, append(defaultValues, c.K8SVersion)...)
ch <- prometheus.MustNewConstMetric(descClusterCacheResources, prometheus.GaugeValue, float64(c.ResourcesCount), defaultValues...)
ch <- prometheus.MustNewConstMetric(descClusterAPIs, prometheus.GaugeValue, float64(c.APIsCount), defaultValues...)
cacheAgeSeconds := -1
if c.LastCacheSyncTime != nil {
cacheAgeSeconds = int(now.Sub(*c.LastCacheSyncTime).Seconds())
}
ch <- prometheus.MustNewConstMetric(descClusterCacheAgeSeconds, prometheus.GaugeValue, float64(cacheAgeSeconds), defaultValues...)
ch <- prometheus.MustNewConstMetric(descClusterConnectionStatus, prometheus.GaugeValue, boolFloat64(c.SyncError == nil), append(defaultValues, c.K8SVersion)...)
}
}