✨ add Slack integration for alert notifications (#53)

.env.example

@@ -25,6 +25,7 @@ IGNORE_PUBLISHERS=BINANCE
 # Prometheus
 TELEGRAM_TOKEN=
 OPSGENIE_API_KEY=
+SLACK_API_URL=
 
 # Server PORT
 PORT=8080

prometheus/alertmanager.yml

@@ -1,5 +1,6 @@
 global:
   resolve_timeout: 5m
+  slack_api_url: "${{SLACK_API_URL}}"
 
 route:
   # When a new group of alerts is created by an incoming alert, wait at
@@ -41,13 +42,23 @@ route:
         severity: critical
       continue: true
 
+    - receiver: "Slack-internal"
+      group_wait: 10s
+      match_re:
+        severity: warning
+      continue: true
+
 receivers:
   - name: "internal-warning"
     telegram_configs:
       - bot_token: "${{TELEGRAM_TOKEN}}}}"
         chat_id: -1001904637278
         parse_mode: "HTML"
         message: '{{ template "telegram.default.message" . }}'
+  - name: "Slack-internal"
+    slack_configs:
+      - channel: "#internal-warning"
+        send_resolved: false
   - name: "internal-critical"
     opsgenie_configs:
       - api_key: "${{OPS_GENIE_API_KEY}}"