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>
at the first iteration, only the following metrics are collected:
- HTTP metrics of each API endpoint
- cache counter for request/hit/miss
- histogram of storage actions, including:
GetContent, PutContent, Stat, List, Move, and Delete
Signed-off-by: tifayuki <tifayuki@gmail.com>