Hi all !
I have a problem to send alerts to slack via webhook. I have a traefik
proxy and alertmanager which run in docker swarm.
So the communication between prometheus and alert is done by docker network
service (alermanager:9093).
Traefik generates certficates with acme let's encrypt and working well but
when alertmanager push an alert to slack, i get this error: "Post
<redacted>: x509: certificate signed by unknown authority"
I don't know if something has changed with let s encrypt certificate or
slack webhook or alertmanager version (v0.19) but it worked before.
My alertmanager configuration:
route:
group_by: [alertname, job]
group_wait: 30s
group_interval: 5m
repeat_interval: 4h
# If an alert isn't caught by a route, send it slack.
receiver: slack_general
routes:
# Send severity=slack alerts to slack.
- match:
severity: info|warning|critical
receiver: slack_general
receivers:
- name: slack_general
slack_configs:
- api_url: *****
channel: '****
username: "****"
send_resolved: true
color: '{{ if eq .Status "firing" }}danger{{ else }}good{{ end }}'
title: '{{ template "custom.title" . }}'
title_link: '{{ template "slack.default.titlelink" . }}'
pretext: '{{ .CommonAnnotations.summary }}'
text: |-
{{ range .Alerts }}
*Alert:* {{ .Annotations.summary }} - `{{ .Labels.severity }}`
*Description:* {{ .Annotations.description }}
*Details:*
{{ range .Labels.SortedPairs }} • *{{ .Name }}:* `{{ .Value }}`
{{ end }}
{{ end }}
fallback: '{{ template "slack.default.fallback" . }}'
icon_url: '{{ template "slack.default.iconurl" . }}'
templates:
- /etc/alertmanager/templates/notification.tmpl
I have no tls configuration in alertmanager but I think I don't need it
because it's traefik that encrypt the alert and send it to slack. Am I
wrong ?
Thanks for your time.
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