...
At this point, as seen previously, we create an AlertmanagerConfig component for sending notifications to Slack, using the following file. Complete the file by replacing the two placeholders: the name of the Slack channel, in which to receive notifications, and the apiURL, in the Secret at the bottom, encoded in base64 (echo <apiURL> | base64 -w0). Then proceed with the apply of the file.
| Code Block |
|---|
| language | yml |
|---|
| title | AlertmanagerConfigSlack.yaml |
|---|
| collapse | true |
|---|
|
apiVersion: monitoring.coreos.com/v1alpha1
kind: AlertmanagerConfig
metadata:
name: alert-slack
namespace: monitoring
labels:
alertmanager: config
spec:
route:
groupBy: [severity]
receiver: 'slack-notifications'
groupWait: 30s
groupInterval: 5m
repeatInterval: 12h
receivers:
- name: 'slack-notifications'
slackConfigs:
- channel: '<#channel>'
apiURL:
name: slack-pass
key: alertmanager.yaml
sendResolved: true
# The following lines can be omitted, they have only an aesthetic value
iconURL: 'https://avatars3.githubusercontent.com/u/3380462'
title: |-
[{{ .Status | toUpper }}{{ if eq .Status "firing" }}:{{ .Alerts.Firing | len }}{{ end }}] {{ .CommonLabels.alertname }} for {{ .CommonLabels.job }}
{{- if gt (len .CommonLabels) (len .GroupLabels) -}}
{{" "}}(
{{- with .CommonLabels.Remove .GroupLabels.Names }}
{{- range $index, $label := .SortedPairs -}}
{{ if $index }}, {{ end }}
{{- $label.Name }}="{{ $label.Value -}}"
{{- end }}
{{- end -}}
)
{{- end }}
text: >-
{{ range .Alerts -}}
*Alert:* {{ .Annotations.title }}{{ if .Labels.severity }} - `{{ .Labels.severity }}`{{ end }}
*Description:* {{ .Annotations.description }}
*Details:*
{{ range .Labels.SortedPairs }} • *{{ .Name }}:* `{{ .Value }}`
{{ end }}
{{ end }}
---
apiVersion: v1
kind: Secret
type: Opaque
metadata:
name: slack-pass
namespace: monitoring
data:
alertmanager.yaml: <apiURL_encode_base64> |
If everything went smoothly (remember to always take a look at the logs of the Alertmanager-0 pod), you should get, in the chosen channel, a result similar to the following. We have 2 notifications for a single alert because we used the sendResolved option in the configuration file above, in order to be notified also when the problem is resolved.
| Section |
|---|
| Column |
|---|
|  Slack Alert Firing
|
| Column |
|---|
|  Slack Alert Resolved
|
|
...