Add support for build category in BuildEvent

infra/tools/send_monitoring_event/common.py

Index: infra/tools/send_monitoring_event/common.py
diff --git a/infra/tools/send_monitoring_event/common.py b/infra/tools/send_monitoring_event/common.py
index 421ed4aa44d80edbf05c2ffb065e33688c138fd7..41065828d130851c139e5931277339c74f77e2a6 100644
--- a/infra/tools/send_monitoring_event/common.py
+++ b/infra/tools/send_monitoring_event/common.py
@@ -111,6 +111,9 @@ def add_argparse_options(parser):
                            help='URL of the patchset that triggered build')
   build_group.add_argument('--build-event-bbucket-id',
                            help='Buildbucket ID for this build')
+  build_group.add_argument('--build-event-category',
+                           help='Build category, e.g. cq or git_cl_try')
+
   build_group.add_argument('--build-event-goma-stats-path',
                            metavar='FILENAME',
                            help='File containing a serialized GomaStats '
@@ -301,6 +304,7 @@ def send_build_event(args):
     extra_result_code=args.build_event_extra_result_code,
     patch_url=args.build_event_patch_url,
     bbucket_id=args.build_event_bbucket_id,
+    category=args.build_event_category,
     timestamp_kind=args.event_mon_timestamp_kind,
     event_timestamp=args.event_mon_event_timestamp,
     goma_stats=goma_stats,
@@ -389,7 +393,8 @@ def read_events_from_file(filename):
             event_timestamp=args.get('event-mon-event-timestamp'),
             service_name=args.get('event-mon-service-name'),
             patch_url=args.get('build-event-patch-url'),
-            bbucket_id=args.get('build-event-bbucket-id')))
+            bbucket_id=args.get('build-event-bbucket-id'),
+            category=args.get('build-event-category')))
       else:
         LOGGER.warning('build-event-type field not found, skipping line '
                        '%d in %s', lineno, filename)