tifayuki 8b70616846 Add notification metrics ... It adds notification related prometheus metrics, including: - total count for events/success/failure/error - total count for notification per each status code - gauge of the pending notification queue Signed-off-by: tifayuki <tifayuki@gmail.com>		2019-02-15 21:14:57 +08:00
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prometheus.go	Add notification metrics	2019-02-15 21:14:57 +08:00