Update prometheus-istio-integration.md

[pratiksharma-dev]

Istio addon has a custom namespace for Istio, so this should be aks-istio-system instead of istio-system

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[pratiksharma-dev]

This configuration is not working, not able to get istio metrics by enabling annotation based scraping for aks-istio-system and default namespace:

Able to make it work by configuring a scraping job:

scrape_configs:
  - job_name: 'kubernetespods-scrape'

    kubernetes_sd_configs:
    - role: pod

    relabel_configs:
    # Scrape only pods with the annotation: prometheus.io/scrape = true
    - source_labels: [__meta_kubernetes_pod_annotation_prometheus_io_scrape]
      action: keep
      regex: true

    # If prometheus.io/path is specified, scrape this path instead of /metrics
    - source_labels: [__meta_kubernetes_pod_annotation_prometheus_io_path]
      action: replace
      target_label: __metrics_path__
      regex: (.+)

    # If prometheus.io/port is specified, scrape this port instead of the default
    - source_labels: [__address__, __meta_kubernetes_pod_annotation_prometheus_io_port]
      action: replace
      regex: ([^:]+)(?::\d+)?;(\d+)
      replacement: $1:$2
      target_label: __address__

    # If prometheus.io/scheme is specified, scrape with this scheme instead of http
    - source_labels: [__meta_kubernetes_pod_annotation_prometheus_io_scheme]
      action: replace
      regex: (http|https)
      target_label: __scheme__

    # Include the pod namespace as a label for each metric
    - source_labels: [__meta_kubernetes_namespace]
      action: replace
      target_label: kubernetes_namespace

    # Include the pod name as a label for each metric
    - source_labels: [__meta_kubernetes_pod_name]
      action: replace
      target_label: kubernetes_pod_name

    # [Optional] Include all pod labels as labels for each metric
    - action: labelmap
      regex: __meta_kubernetes_pod_label_(.+)

This configmap is applied to ama-metrics-prometheus-config as it has definition for scrape jobs

kubectl create configmap ama-metrics-prometheus-config --from-file=prometheus-config -n kube-system

The benefit here is that scraping will work even when mTLS is enforced by istio

I can help with editing of this article, feel free to reach out to me.

[Court72]

@bwren

Can you review the proposed changes?

Important: When the changes are ready for publication, adding a #sign-off comment is the best way to signal that the PR is ready for the review team to merge.

#label:"aq-pr-triaged"
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