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Add Prometheus configMap for k3s (#659)
Linear issue: [REL-809: Investigate why Grafana is not showing Prometheus data](https://linear.app/sourcegraph/issue/REL-809/investigate-why-grafana-is-not-showing-prometheus-data) ### Checklist - [x] Follow the [manual testing process](https://github.com/sourcegraph/deploy-sourcegraph-helm/blob/main/TEST.md) - [ ] Update [changelog](https://github.com/sourcegraph/deploy-sourcegraph-helm/blob/main/charts/sourcegraph/CHANGELOG.md) - [ ] Update [Kubernetes update doc](https://docs.sourcegraph.com/admin/updates/kubernetes) ### Test plan Tested with a customer self-hosting on k3s, and on our AMI running k3s <!-- As part of SOC2/GN-104 and SOC2/GN-105 requirements, all pull requests are REQUIRED to provide a "test plan". A test plan is a loose explanation of what you have done or implemented to test this, as outlined in our Testing principles and guidelines: https://docs.sourcegraph.com/dev/background-information/testing_principles Write your test plan here after the "Test plan" header. -->
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‎charts/sourcegraph/examples/prometheus/README.md‎

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# Prometheus ConfigMap Override
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## Why
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- Some self-hosted customers run their instances on non-standard Kubernetes clusters, such as k3s, which expose metrics using different names / labels
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- Our Grafana dashboards expect metrics to be on our Prometheus container with specific names
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- Using the default configMap, the Grafana graphs do not show some metrics, although they may exist on Prometheus
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- Use this configMap to rename k3s' metrics to match our Grafana dashboard queries
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## How to Use
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- Apply the override configMap via `kubectl apply -f prometheus-override-k3s.ConfigMap.yaml`
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- Add the new configMap's name in your Helm values override file, ex:
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```yaml
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prometheus:
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existingConfig: prometheus-override-k3s
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```
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- Re-apply your Helm values override file, which may restart the Prometheus pod, but should not restart other services
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## Notes
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- Copied from https://github.com/sourcegraph/deploy/blob/main/install/prometheus-override.ConfigMap.yaml
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- If this situation (matching symptoms and root cause) is found with other types of Kubernetes clusters, new Prometheus override configMaps could be created
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## Troubleshooting Empty Grafana Dashboards
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- There are a handful of steps in the metrics pipeline where data could be getting lost:
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- Are the cAdvisor, node-exporter, Prometheus, and Grafana containers all running, and healthy?
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- Are any of these pods reporting any issues in their Kubernetes events, or container logs?
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- Is network connectivity open from Prometheus to each of the cAdvisor / node-exporter containers?
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- Is network connectivity open from Grafana to Prometheus?
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- Does Prometheus have access to Kubernetes RBAC roles to use Service Discovery to find the IP addresses of cAdvisor and node-exporter pods?

‎charts/sourcegraph/examples/prometheus/prometheus-override-k3s.ConfigMap.yaml‎

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apiVersion: v1
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kind: ConfigMap
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metadata:
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labels:
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deploy: sourcegraph
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name: prometheus-override-k3s
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data:
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node_rules.yml: ''
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extra_rules.yml: ''
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prometheus.yml: |
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global:
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scrape_interval: 30s
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evaluation_interval: 30s
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alerting:
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alertmanagers:
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- static_configs:
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- targets: ['127.0.0.1:9093']
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path_prefix: /alertmanager
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rule_files:
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- '*_rules.yml'
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- "/sg_config_prometheus/*_rules.yml"
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- "/sg_prometheus_add_ons/*_rules.yml"
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scrape_configs:
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- job_name: 'kubernetes-apiservers'
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kubernetes_sd_configs:
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- role: endpoints
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scheme: https
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tls_config:
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ca_file: /var/run/secrets/kubernetes.io/serviceaccount/ca.crt
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bearer_token_file: /var/run/secrets/kubernetes.io/serviceaccount/token
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relabel_configs:
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- source_labels: [__meta_kubernetes_namespace, __meta_kubernetes_service_name, __meta_kubernetes_endpoint_port_name]
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action: keep
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regex: default;kubernetes;https
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- job_name: 'kubernetes-nodes'
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scheme: https
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tls_config:
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ca_file: /var/run/secrets/kubernetes.io/serviceaccount/ca.crt
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insecure_skip_verify: true
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bearer_token_file: /var/run/secrets/kubernetes.io/serviceaccount/token
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kubernetes_sd_configs:
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- role: node
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relabel_configs:
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- action: labelmap
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regex: __meta_kubernetes_node_label_(.+)
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- target_label: __address__
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replacement: kubernetes.default.svc:443
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############################################################################################################
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# k3s and cAdvisor-specific customization
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# name container metrics after their container name labels
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# Note that 'io.kubernetes.container.name' and 'io.kubernetes.pod.name' must be provided in cAdvisor
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############################################################################################################
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- source_labels: [__meta_kubernetes_node_name]
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regex: (.+)
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target_label: __metrics_path__
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replacement: /api/v1/nodes/${1}/proxy/metrics/cadvisor
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metric_relabel_configs:
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- source_labels: [container, pod]
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regex: (.+)
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action: replace
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target_label: name
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separator: '-'
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- source_labels: [container]
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regex: (.+)
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action: replace
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target_label: container_label_io_kubernetes_container_name
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- source_labels: [pod]
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regex: (.+)
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action: replace
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target_label: container_label_io_kubernetes_pod_name
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############################################################################################################
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- job_name: 'kubernetes-service-endpoints'
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kubernetes_sd_configs:
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- role: endpoints
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relabel_configs:
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- source_labels: [__meta_kubernetes_service_annotation_sourcegraph_prometheus_scrape]
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action: keep
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regex: true
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- source_labels: [__meta_kubernetes_service_annotation_prometheus_io_scheme]
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action: replace
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target_label: __scheme__
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regex: (https?)
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- source_labels: [__meta_kubernetes_service_annotation_prometheus_io_path]
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action: replace
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target_label: __metrics_path__
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regex: (.+)
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- source_labels: [__address__, __meta_kubernetes_service_annotation_prometheus_io_port]
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action: replace
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target_label: __address__
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regex: (.+)(?::\d+);(\d+)
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replacement: $1:$2
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- action: labelmap
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regex: __meta_kubernetes_service_label_(.+)
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- source_labels: [__meta_kubernetes_namespace]
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action: replace
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target_label: ns
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- source_labels: [__meta_kubernetes_service_name]
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action: replace
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target_label: kubernetes_name
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# Sourcegraph specific customization. We want a nicer name for job
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- source_labels: [app]
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action: replace
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target_label: job
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# Sourcegraph specific customization. We want a nicer name for instance
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- source_labels: [__meta_kubernetes_pod_name]
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action: replace
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target_label: instance
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- job_name: 'kubernetes-services'
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metrics_path: /probe
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params:
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module: [http_2xx]
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kubernetes_sd_configs:
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- role: service
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relabel_configs:
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- source_labels: [__meta_kubernetes_service_annotation_prometheus_io_probe]
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action: keep
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regex: true
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- source_labels: [__address__]
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target_label: __param_target
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- target_label: __address__
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replacement: blackbox
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- source_labels: [__param_target]
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target_label: instance
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- action: labelmap
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regex: __meta_kubernetes_service_label_(.+)
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- source_labels: [__meta_kubernetes_service_namespace]
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target_label: ns
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- source_labels: [__meta_kubernetes_service_name]
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target_label: kubernetes_name
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- job_name: 'kubernetes-pods'
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kubernetes_sd_configs:
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- role: pod
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relabel_configs:
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# Sourcegraph specific customization, only scrape pods with our annotation
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- source_labels: [__meta_kubernetes_pod_annotation_sourcegraph_prometheus_scrape]
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action: keep
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regex: true
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- source_labels: [__meta_kubernetes_pod_annotation_prometheus_io_path]
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action: replace
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target_label: __metrics_path__
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regex: (.+)
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- source_labels: [__address__, __meta_kubernetes_pod_annotation_prometheus_io_port]
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action: replace
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regex: (.+):(?:\d+);(\d+)
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replacement: ${1}:${2}
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target_label: __address__
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- action: labelmap
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regex: __meta_kubernetes_pod_label_(.+)
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- source_labels: [__meta_kubernetes_pod_name]
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action: replace
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target_label: kubernetes_pod_name
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############################################################################################################
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# k3s and cAdvisor-specific customization
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############################################################################################################
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- source_labels: [namespace]
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action: replace
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target_label: ns
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metric_relabel_configs:
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- source_labels: [kubernetes_io_hostname]
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regex: sourcegraph-0
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action: keep
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- source_labels: [namespace]
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regex: default
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action: keep
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############################################################################################################
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# Scrape prometheus itself for metrics.
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- job_name: 'builtin-prometheus'
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static_configs:
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- targets: ['127.0.0.1:9092']
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labels:
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app: prometheus
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- job_name: 'builtin-alertmanager'
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metrics_path: /alertmanager/metrics
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static_configs:
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- targets: ['127.0.0.1:9093']
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labels:
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app: alertmanager

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