Prometheus

The Botkube Prometheus source plugin allows you to fetch alerts from AlertManager of Prometheus deployment and notify in configured platforms.

The Prometheus plugin is hosted by the official Botkube plugin repository. To enable the Prometheus plugin, make sure that the botkube repository is defined under plugins in the values.yaml file.

plugins:
  repositories:
    botkube:
      url: https://github.com/kubeshop/botkube/releases/download/v0.18.0/plugins-index.yaml

Enabling plugin

To enable Prometheus plugin, add --set 'sources.prometheus.botkube/prometheus.enabled=true' to a given Helm install command.

Syntax

# Map of sources. The `sources` property name is an alias for a given configuration.
# Key name is used as a binding reference.
#
# Format: sources.{alias}
sources:
  "plugin-based":
    botkube/prometheus: # Plugin name syntax: <repo>/<plugin>[@<version>]. If version is not provided, the latest version from repository is used.
      enabled: true # If not enabled, plugin is not downloaded and started.
      config: # Plugin's specific configuration.
        url: "http://localhost:9090" # Prometheus host to fetch alerts via Prometheus HTTP API
        alertStates: ["firing", "pending", "inactive"] # Provided alert states will overwrite default values. For example, Prometheus plugin will notify for only `firing` alerts if `alertStates` is `["firing"]`.
        ignoreOldAlerts: true # If set to true, only the alerts that active since Botkube deployment start time. Otherwise, plugin will fetch all the alerts available in AlertManager on Botkube start.

Merging strategy

For all collected prometheus sources bindings, configuration properties are overridden based on the order of the binding list. The priority is given to the last binding specified on the list. Empty properties are omitted.

Example

Consider such configuration:

communications:
  "default-group":
    slack:
      channels:
        "default":
          name: "random"
          bindings:
            sources:
              - prometheus-one
              - prometheus-two
              - prometheus-three

sources:
  "prometheus-one":
    botkube/prometheus:
      enabled: true
      config:
        url: "http://localhost:9090"
        ignoreOldAlerts: false
        alertStates: ["firing"]
  "prometheus-two":
    botkube/prometheus:
      enabled: true
      config:
        ignoreOldAlerts: true
  "prometheus-three":
    botkube/prometheus:
      enabled: false
      config:
        url: "http://localhost:9091"
        ignoreOldAlerts: true
        alertStates: ["inactive"]

We can see that:

• The ignoreOldAlerts is set to true as it's overridden by the prometheus-two binding - the last one which is both enabled and sets the ignoreOldAlerts property.
• The url and alertStates are set to values specified by the prometheus-one configuration as the prometheus-two don't specify them.
• The prometheus-three binding is disabled (botkube/prometheus.enabled is set to false), so it's not taken into account.