Added standard Datadog tag type:change to simplify filtering when the…

…re's many sources of changes (terraform, ..)

src/lighter/datadog.py

@@ -7,7 +7,7 @@ class Datadog(object):
     def __init__(self, token, tags=[]):
         self._token = token
         self._url = 'https://app.datadoghq.com'
-        self._tags = tags + ['source:lighter']
+        self._tags = tags + ['source:lighter', 'type:change']
 
     def notify(self, title, message, id, tags=[], priority='normal', alert_type='success'):
         if not title or not message or not id:

src/lighter/test/datadog_test.py

@@ -65,7 +65,8 @@ def testDefaultTags(self):
             expected = [
                 'environment:default',
                 u'service:/myproduct/myservice',
-                'source:lighter']
+                'source:lighter',
+                'type:change']
             self.assertEquals(expected, mock_jsonRequest.call_args[1]['data']['tags'])
 
     def testConfiguredTags(self):
@@ -79,7 +80,8 @@ def testConfiguredTags(self):
                 'somekey:someval',
                 'anotherkey:anotherval',
                 'justakey',
-                'source:lighter']
+                'source:lighter',
+                'type:change']
             self.assertEquals(expected, mock_jsonRequest.call_args[1]['data']['tags'])
 
     def testDeploymentMetric(self):
@@ -93,7 +95,8 @@ def testDeploymentMetric(self):
                 'somekey:someval',
                 'anotherkey:anotherval',
                 'justakey',
-                'source:lighter']
+                'source:lighter',
+                'type:change']
             data = mock_jsonRequest.call_args_list[-2][1]['data']['series'][0]
             self.assertEquals('lighter.deployments', data['metric'])
             self.assertEquals(1, data['points'][0][1])