Add support for Grafana annotations API

[fsequeira1]

Related to: fluxcd/flux2#1024
This provider allows sending notifications to Grafana as annotations. To show the annotations on a dashboard there is a default tag (flux) that needs to be enabled.

Signed-off-by: Filipe Sequeira filipe@weave.works

[fsequeira1]

Create Grafana provider and alert

apiVersion: notification.toolkit.fluxcd.io/v1beta1
kind: Provider
metadata:
  name: grafana
  namespace: flux-system
spec:
  type: grafana
  address: http://grafana.istio-system.svc.cluster.local/api/annotations
---
apiVersion: notification.toolkit.fluxcd.io/v1beta1
kind: Alert
metadata:
  name: test-grafana
  namespace: flux-system
spec:
  providerRef:
    name: grafana
  eventSeverity: info
  eventSources:
    - kind: GitRepository
      name: '*'
    - kind: Kustomization
      name: '*'
    - kind: HelmRelease
      name: '*'

how to enable annotations on a dashboard

Grafana dashboard settings

• Annotations > Query > Match any
• Annotations > Query > Tags (Add: flux)
  

##example

[stefanprodan]

Hi @fsequeira1 thanks for your contribution. Can you please rebase with main and add grafana to the API docs provider table and also add an example in the alerts docs. The docs are here: https://github.com/fluxcd/notification-controller/tree/main/docs/spec/v1beta1

[fsequeira1]

Hello @stefanprodan. can you please confirm if it is ok now?

[stefanprodan]

@fsequeira1 please rebase with upstream main and signoff your commits.

[stefanprodan]

@fsequeira1 this looks great now. Can you squash all commits and force push a single signed commit please.

[stefanprodan]

LGTM

Thanks @fsequeira1 🥇

[talaverant]

Great contribution @fsequeira1 ! Look forward to the prometheus provider 👍