[stable/prometheus] added slow pod scrape config (#20443)

* added slow pod scrape config

Signed-off-by: André Bauer <andre.bauer@kiwigrid.com>

* removed whitespace

Signed-off-by: André Bauer <andre.bauer@kiwigrid.com>

stable/prometheus/Chart.yaml

@@ -1,6 +1,6 @@
 apiVersion: v1
 name: prometheus
-version: 10.3.1
+version: 10.4.0
 appVersion: 2.15.2
 description: Prometheus is a monitoring system and time series database.
 home: https://prometheus.io/

stable/prometheus/values.yaml

@@ -1496,6 +1496,45 @@ serverFiles:
             action: replace
             target_label: kubernetes_pod_name
 
+      # Example Scrape config for pods which should be scraped slower. An useful example
+      # would be stackriver-exporter which querys an API on every scrape of the pod
+      #
+      # The relabeling allows the actual pod scrape endpoint to be configured via the
+      # following annotations:
+      #
+      # * `prometheus.io/scrape-slow`: Only scrape pods that have a value of `true`
+      # * `prometheus.io/path`: If the metrics path is not `/metrics` override this.
+      # * `prometheus.io/port`: Scrape the pod on the indicated port instead of the default of `9102`.
+      - job_name: 'kubernetes-pods-slow'
+
+        scrape_interval: 5m
+        scrape_timeout: 30s
+
+        kubernetes_sd_configs:
+          - role: pod
+
+        relabel_configs:
+          - source_labels: [__meta_kubernetes_pod_annotation_prometheus_io_scrape_slow]
+            action: keep
+            regex: true
+          - source_labels: [__meta_kubernetes_pod_annotation_prometheus_io_path]
+            action: replace
+            target_label: __metrics_path__
+            regex: (.+)
+          - source_labels: [__address__, __meta_kubernetes_pod_annotation_prometheus_io_port]
+            action: replace
+            regex: ([^:]+)(?::\d+)?;(\d+)
+            replacement: $1:$2
+            target_label: __address__
+          - action: labelmap
+            regex: __meta_kubernetes_pod_label_(.+)
+          - source_labels: [__meta_kubernetes_namespace]
+            action: replace
+            target_label: kubernetes_namespace
+          - source_labels: [__meta_kubernetes_pod_name]
+            action: replace
+            target_label: kubernetes_pod_name
+
 # adds additional scrape configs to prometheus.yml
 # must be a string so you have to add a | after extraScrapeConfigs:
 # example adds prometheus-blackbox-exporter scrape config