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Prometheus Scrape Config Operator

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Description

The Prometheus scrape config operator is an adapter charm that enables you to apply a set of configurations to the scrape jobs provided by its upstream charms, and forward the modified scrape jobs downstream to one or more consumers that will actually perform the scraping. For a detailed explanation of the deployment scenario, see the integration doc.

Usage

First, deploy the prometheus and the charm you want to be monitored with a modified configuration.

$ juju deploy prometheus-k8s prometheus
$ juju deploy your-charm

Then, deploy the prometheus-scrape-configuration charm, specifying a custom scrape interval valid only for the scrape job forwarded to prometheus-k8s through its relation with this charm.

$ juju deploy \
    prometheus-scrape-config-k8s \
    scrape-interval-config \
    --config scrape_interval=20s

Relate the charms together.

$ juju relate your-charm scrape-interval-config
$ juju relate scrape-interval-config:metrics-endpoint prometheus

blocked state

If you relate prometheus-scrape-config-k8s only to prometheus, the charm will be in blocked state until any other charm relates to it. This is expected and doesn't mean the environment is in a wrong state.

Unit                             Workload  Agent      Address       Ports          Message
prometheus-scrape-config-k8s/0*  blocked   idle                                    missing metrics provider (relate to upstream charm?)
prometheus/0*                    active    idle
your-charm/0*                    active    idle

After a prometheus_scrape relation is added, the charm will go into active state.

$ juju relate your-charm:metrics-endpoint prometheus-scrape-config-k8s:configurable-scrape-jobs
$ juju status
(...)

Unit                             Workload  Agent  Address       Ports          Message
prometheus-scrape-config-k8s/0*  active    idle
prometheus/0*                    active    idle
your-charm/0*                    active    idle

Relations

  • A configurable-scrape-jobs relation with any Charm that uses the MetricsEndpointProvider to implement the prometheus_scrape interface.
  • A metrics-endpoint relation with one or more Charms that implement the MetricsEndpointConsumer, such as the Prometheus charm.

OCI Image

This charm is workloadless, in the sense that it does not use any OCI images to spawn additional workloads.

Contributing

Please see the Juju SDK docs as well as CONTRIBUTING.md for more information on how to contribute to this charm.