*: add Procfile for example setup

This add a Procfile that can be run with `goreman start`. It starts
three Alertmanagers and one webhook receiver. The webhook receiver
simply reflects sent messages.
The send_alerts.sh script simulates a set of alerts sent by a Prometheus
server to all Alertmanagers at once.

Procfile

@@ -0,0 +1,5 @@
+a1: ./alertmanager -log.level=debug -storage.path=$TMPDIR/a1 -web.listen-address=:9093 -mesh.hardware-address=00:00:00:00:00:01 -mesh.nickname=a -mesh.listen-address=:8001 -config.file=examples/ha/alertmanager.yaml
+a2: ./alertmanager -log.level=debug -storage.path=$TMPDIR/a2 -web.listen-address=:9094 -mesh.hardware-address=00:00:00:00:00:02 -mesh.nickname=b -mesh.listen-address=:8002 -mesh.peer=127.0.0.1:8001 -config.file=examples/ha/alertmanager.yaml
+a3: ./alertmanager -log.level=debug -storage.path=$TMPDIR/a3 -web.listen-address=:9095 -mesh.hardware-address=00:00:00:00:00:03 -mesh.nickname=c -mesh.listen-address=:8003 -mesh.peer=127.0.0.1:8001 -config.file=examples/ha/alertmanager.yaml
+wh: ./examples/ha/webhook.py
+

examples/ha/send_alerts.sh

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+alerts1='[
+  {
+    "labels": {
+       "alertname": "DiskRunningFull",
+       "dev": "sda1",
+       "instance": "example1"
+     }
+  },
+  {
+    "labels": {
+       "alertname": "DiskRunningFull",
+       "dev": "sda2",
+       "instance": "example1"
+     }
+  },
+  {
+    "labels": {
+       "alertname": "DiskRunningFull",
+       "dev": "sda1",
+       "instance": "example2"
+     }
+  },
+  {
+    "labels": {
+       "alertname": "DiskRunningFull",
+       "dev": "sdb2",
+       "instance": "example2"
+     }
+  },
+  {
+    "labels": {
+       "alertname": "DiskRunningFull",
+       "dev": "sda1",
+       "instance": "example3"
+     }
+  }
+]'
+curl -XPOST -d"$alerts1" http://localhost:9093/api/v1/alerts
+curl -XPOST -d"$alerts1" http://localhost:9094/api/v1/alerts
+curl -XPOST -d"$alerts1" http://localhost:9095/api/v1/alerts

examples/ha/webhook.py

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+#!/usr/bin/env python
+# Reflects the requests from HTTP methods GET, POST, PUT, and DELETE
+# Written by Nathan Hamiel (2010)
+
+from BaseHTTPServer import HTTPServer, BaseHTTPRequestHandler
+from optparse import OptionParser
+
+class RequestHandler(BaseHTTPRequestHandler):
+    
+    def do_GET(self):
+        
+        request_path = self.path
+        
+        print("\n----- Request Start ----->\n")
+        print(request_path)
+        print(self.headers)
+        print("<----- Request End -----\n")
+        
+        self.send_response(200)
+        self.end_headers()
+        
+    def do_POST(self):
+        
+        request_path = self.path
+        
+        print("\n----- Request Start ----->\n")
+        print(request_path)
+        
+        request_headers = self.headers
+        content_length = request_headers.getheaders('content-length')
+        length = int(content_length[0]) if content_length else 0
+        
+        print(request_headers)
+        print(self.rfile.read(length))
+        print("<----- Request End -----\n")
+        
+        self.send_response(200)
+        self.end_headers()
+    
+    do_PUT = do_POST
+    do_DELETE = do_GET
+        
+def main():
+    port = 5001
+    print('Listening on localhost:%s' % port)
+    server = HTTPServer(('', port), RequestHandler)
+    server.serve_forever()
+
+        
+if __name__ == "__main__":
+    parser = OptionParser()
+    parser.usage = ("Creates an http-server that will echo out any GET or POST parameters\n"
+                    "Run:\n\n"
+                    "   reflect")
+    (options, args) = parser.parse_args()
+    
+    main()