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Add optional namespace restriction to prometheus input plugin #5697

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Apr 10, 2019
Merged

Add optional namespace restriction to prometheus input plugin #5697

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1f389d9
Allow prometheus to operate as a namespaced pod with namespace level …
Apr 8, 2019
965c31c
update sample configs for prometheus
dtimm Apr 9, 2019
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4 changes: 4 additions & 0 deletions plugins/inputs/prometheus/README.md
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Expand Up @@ -24,6 +24,8 @@ in Prometheus format.
## - prometheus.io/path: If the metrics path is not /metrics, define it with this annotation.
## - prometheus.io/port: If port is not 9102 use this annotation
# monitor_kubernetes_pods = true
## Only monitor one namespace
# monitor_kubernetes_pods_namespace = "test-namespace"
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## Use bearer token for authorization. ('bearer_token' takes priority)
# bearer_token = "/path/to/bearer/token"
Expand Down Expand Up @@ -64,6 +66,8 @@ Currently the following annotation are supported:
* `prometheus.io/path` Override the path for the metrics endpoint on the service. (default '/metrics')
* `prometheus.io/port` Used to override the port. (default 9102)

Using the `monitor_kubernetes_pods_namespace` option allows you to limit which pods you are scraping.

#### Bearer Token

If set, the file specified by the `bearer_token` parameter will be read on
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2 changes: 1 addition & 1 deletion plugins/inputs/prometheus/kubernetes.go
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Expand Up @@ -83,7 +83,7 @@ func (p *Prometheus) start(ctx context.Context) error {
// directed to do so by K8s.
func (p *Prometheus) watch(ctx context.Context, client *k8s.Client) error {
pod := &corev1.Pod{}
watcher, err := client.Watch(ctx, "", &corev1.Pod{})
watcher, err := client.Watch(ctx, p.PodNamespace, &corev1.Pod{})
if err != nil {
return err
}
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5 changes: 4 additions & 1 deletion plugins/inputs/prometheus/prometheus.go
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Expand Up @@ -41,7 +41,8 @@ type Prometheus struct {
client *http.Client

// Should we scrape Kubernetes services for prometheus annotations
MonitorPods bool `toml:"monitor_kubernetes_pods"`
MonitorPods bool `toml:"monitor_kubernetes_pods"`
PodNamespace string `toml:"monitor_kubernetes_pods_namespace"`
lock sync.Mutex
kubernetesPods map[string]URLAndAddress
cancel context.CancelFunc
Expand All @@ -65,6 +66,8 @@ var sampleConfig = `
## - prometheus.io/path: If the metrics path is not /metrics, define it with this annotation.
## - prometheus.io/port: If port is not 9102 use this annotation
# monitor_kubernetes_pods = true
## Only monitor one namespace
# monitor_kubernetes_pods_namespace = "test-namespace"

## Use bearer token for authorization. ('bearer_token' takes priority)
# bearer_token = "/path/to/bearer/token"
Expand Down