added support for telegram notifications

defaults/main.yml

 prometheus_alertmanager:
+  telegrambot: False
   args:
     "web.listen-address": "[::1]:9093"
   config:
@@ -25,7 +26,7 @@ prometheus_alertmanager:
       # resend them.
       repeat_interval: 3h
       # A default receiver
-      receiver: mail-default
+      receiver: default
       # All the above attributes are inherited by all child routes and can
       # overwritten on each.
       # The child route trees.
@@ -43,7 +44,7 @@ prometheus_alertmanager:
       equal: ['alertname', 'cluster', 'service']
     receivers:
     - name: "blackhole"
-    - name: 'mail-default'
+    - name: 'default'
       send_resolved: True
       email_configs:
       - to: 'root@localhost'

files/prometheus-telegram-bot.service

+[Unit]
+Description=Sends alerts via telegram
+After=network.target
+
+[Service]
+ExecStart=/usr/local/bin/prometheus-telegram-bot.py PROD
+
+DynamicUser=yes
+NoNewPrivileges=True
+ProtectSystem=strict
+
+[Install]
+WantedBy=multi-user.target
+

handlers/main.yml

@@ -2,3 +2,9 @@
   service:
     name: prometheus-alertmanager
     state: restarted
+- name: restart telegram bot
+  service:
+    name: prometheus-telegram-bot
+    enabled: True
+    daemon_reload: True
+    state: restarted

tasks/main.yml

@@ -16,3 +16,33 @@
     mode: 0644
     dest: /etc/prometheus/alertmanager.yml
     content: "{{ prometheus_alertmanager.config|to_nice_yaml(indent=2) }}"
+
+- name: setup telegram bot
+  when: prometheus_alertmanager.telegrambot
+  block:
+  - name: install dependencies
+    apt:
+      pkg:
+        - python3-flask
+        - python3-dateutil
+        - python3-gevent
+        - python3-pip
+#        - python3-telegram-bot
+  - pip:
+      name: python-telegram-bot
+      executable: pip3
+  - name: deploy telegram bot
+    notify: restart telegram bot
+    template:
+      src: telegram-bot.py.j2
+      dest: /usr/local/bin/prometheus-telegram-bot.py
+      mode: 0755
+      owner: root
+      group: root
+  - name: Copy systemd service file
+    notify: restart telegram bot
+    copy:
+      src: prometheus-telegram-bot.service
+      dest: /etc/systemd/system
+      owner: root
+      group: root

templates/telegram-bot.py.j2

+#!/usr/bin/env python3
+import os
+import sys
+from dateutil import parser
+import telegram, json, logging
+from flask import Flask, request
+
+listenPort = 29119
+listenIP = '::1'
+botToken = '{{ prometheus_alertmanager.telegrambot }}'
+
+app = Flask(__name__)
+app.secret_key = os.urandom(128)
+
+bot = telegram.Bot(token=botToken)
+
+@app.route('/<chatID>/alert', methods = ['POST'])
+def postAlertmanager(chatID):
+
+	try:
+		content = json.loads(request.get_data())
+		for alert in content['alerts']:
+			message = "Status: "+alert['status']+"\n"
+			if 'name' in alert['labels']:
+				message += "Instance: "+alert['labels']['instance']+"("+alert['labels']['name']+")\n"
+			else:
+				message += "Instance: "+alert['labels']['instance']+"\n"
+			if 'info' in alert['annotations']:
+				message += "Info: "+alert['annotations']['info']+"\n"
+			if 'summary' in alert['annotations']:
+				message += "Summary: "+alert['annotations']['summary']+"\n"
+			if 'description' in alert['annotations']:
+				message += "Description: "+alert['annotations']['description']+"\n"
+			if alert['status'] == "resolved":
+				correctDate = parser.parse(alert['endsAt']).strftime('%Y-%m-%d %H:%M:%S')
+				message += "Resolved: "+correctDate
+			elif alert['status'] == "firing":
+				correctDate = parser.parse(alert['startsAt']).strftime('%Y-%m-%d %H:%M:%S')
+				message += "Started: "+correctDate
+			bot.sendMessage(chat_id=chatID, text=message)
+			return "Alert OK", 200
+	except Exception as error:	   
+		bot.sendMessage(chat_id=chatID, text="Error to read json: "+str(error))
+		app.logger.info("\t%s",error)
+		return "Alert fail", 200
+
+if __name__ == '__main__':
+	if len(sys.argv) == 1:
+		logging.basicConfig(level=logging.INFO)
+		app.run(host=listenIP, port=listenPort)
+	else:
+		from gevent.pywsgi import WSGIServer
+		http_server = WSGIServer((listenIP, listenPort), app)
+		http_server.serve_forever()