Slack¶

Standard Slack incoming webhook. The lowest-friction channel to set up.

Get a webhook URL¶

Go to api.slack.com/messaging/webhooks.
Create or pick a Slack app, enable Incoming Webhooks, add one for the target channel.
Copy the URL: https://hooks.slack.com/services/T0XXX/B0XXX/xxxxxx.

Configure¶

ConfigMap:

channels:
  slack:
    webhook_url_from_secret: SLACK_WEBHOOK_URL
    default: true

Secret:

kubectl -n kpulse edit secret kpulse-secrets
# under stringData add:
#   SLACK_WEBHOOK_URL: https://hooks.slack.com/services/T0/B0/xxx

Apply:

kubectl -n kpulse rollout restart deploy/kpulse

Test¶

kubectl -n kpulse port-forward svc/kpulse 8080:8080 &
curl 'http://localhost:8080/test-channel?name=slack'

Message format¶

What kpulse sends to Slack (raw):

:rotating_light: *[prod-eks-1]* `checkout/pod/api-7d9f` OOMKilled on api-7d9f/server
Container server in pod checkout/api-7d9f is in state OOMKilled

What Slack renders:

🚨 [prod-eks-1] checkout/pod/api-7d9f OOMKilled on api-7d9f/server Container server in pod checkout/api-7d9f is in state OOMKilled

Severity emoji:

Severity	Slack code	Renders as
info	`:information_source:`	ℹ️
warning	`:warning:`	⚠️
critical	`:rotating_light:`	🚨

Helm¶

helm upgrade kpulse oci://ghcr.io/dnl555/charts/kpulse \
  --reuse-values \
  --set channels.slack.enabled=true \
  --set-string channels.secrets.SLACK_WEBHOOK_URL="https://hooks.slack.com/..."