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Documentation Grafana Loki Installation Deploy on Kubernetes Configure monitoring and alerting

Configure monitoring and alerting

By default this Helm Chart configures meta-monitoring of metrics (service monitoring) and logs (self monitoring).

The ServiceMonitor resource works with either the Prometheus Operator or the Grafana Agent Operator, and defines how Loki’s metrics should be scraped. Scraping this Loki cluster using the scrape config defined in the SerivceMonitor resource is required for the included dashboards to work. A MetricsInstance can be configured to write the metrics to a remote Prometheus instance such as Grafana Cloud Metrics.

Self monitoring is enabled by default. This will deploy a GrafanaAgent, LogsInstance, and PodLogs resource which will instruct the Grafana Agent Operator (installed seperately) on how to scrape this Loki cluster’s logs and send them back to itself. Scraping this Loki cluster using the scrape config defined in the PodLogs resource is required for the included dashboards to work.

Rules and alerts are automatically deployed.

Before you begin:

• Helm 3 or above. See Installing Helm.
• A running Kubernetes cluster with a running Loki deployment.
• A running Grafana instance.
• A running Prometheus operator in order for recording rules for the dashboards to work.

To install the dashboards:

1. Dashboards are enabled by default. Set monitoring.dashboards.namespace to the namespace of the Grafana instance if it is in a different namespace than this Loki cluster.

To add add additional Prometheus rules:

1. Modify the configuration file values.yaml:

   yaml Copy

   monitoring:
     rules:
       additionalGroups:
         - name: loki-rules
           rules:
             - record: job:loki_request_duration_seconds_bucket:sum_rate
               expr: sum(rate(loki_request_duration_seconds_bucket[1m])) by (le, job)
             - record: job_route:loki_request_duration_seconds_bucket:sum_rate
               expr: sum(rate(loki_request_duration_seconds_bucket[1m])) by (le, job, route)
             - record: node_namespace_pod_container:container_cpu_usage_seconds_total:sum_rate
               expr: sum(rate(container_cpu_usage_seconds_total[1m])) by (node, namespace, pod, container)

To disable monitoring:

1. Modify the configuration file values.yaml:

   yaml Copy

   selfMonitoring:
       enabled: false
   
   serviceMonitor:
       enabled: false

To use a remote Prometheus and Loki instance such as Grafana Cloud

1. Create a secrets.yaml file with credentials to access the Grafana Cloud services:

   yaml Copy

   ---
   apiVersion: v1
   kind: Secret
   metadata:
     name: primary-credentials-metrics
     namespace: default
   stringData:
     username: '<instance ID>'
     password: '<API key>'
   ---
   apiVersion: v1
   kind: Secret
   metadata:
     name: primary-credentials-logs
     namespace: default
   stringData:
     username: '<instance ID>'
     password: '<API key>'

2. Add the secret to Kubernetes with kubectl create -f secret.yaml.

3. Add a remoteWrite section to serviceMonitor in values.yaml:

   yaml Copy

   monitoring:
   ...
     serviceMonitor:
       enabled: true
       ...
       metricsInstance:
         remoteWrite:
         - url: <metrics remote write endpoint>
           basicAuth:
             username:
               name: primary-credentials-metrics
               key: username
             password:
               name: primary-credentials-metrics
               key: password

4. Add a client to monitoring.selfMonitoring.logsInstance.clients:

   yaml Copy

   monitoring:
   ...
   selfMonitoring:
     enabled: true
     lokiCanary:
       enabled: false
     logsInstance:
       clients:
       - url: <logs remote write endpoint>
         basicAuth:
           username:
             name: primary-credentials-logs
             key: username
           password:
             name: primary-credentials-logs
             key: password 

5. Install the Loki meta-motoring connection on Grafana Cloud.