Monitor queue adds and EC2 node starts

fixes #157
see #304

buildman/manager/ephemeral.py

@@ -10,6 +10,7 @@ from trollius import From, coroutine, Return, async
 from concurrent.futures import ThreadPoolExecutor
 from urllib3.exceptions import ReadTimeoutError, ProtocolError
 
+from app import metric_queue
 from buildman.manager.basemanager import BaseManager
 from buildman.manager.executor import PopenExecutor, EC2Executor
 from buildman.component.buildcomponent import BuildComponent
@@ -335,6 +336,7 @@ class EphemeralBuilderManager(BaseManager):
 
     try:
       builder_id = yield From(self._executor.start_builder(realm, token, build_uuid))
+      metric_queue.put('EC2BuilderStarted', 1, unit='Count')
     except:
       logger.exception('Exception when starting builder for job: %s', build_uuid)
       raise Return(False, EC2_API_TIMEOUT)