This patch will add more granularity to shard operation cache or
backend metrics, and then remove some of existing and duplicated
metrics.
Before this patch, related metrics are:
1.shard_<op>.cache.[hit|miss|skip]
2.shard_<op>.backend.<status_int>
where op is 'listing' or 'updating'.
With this patch, they are going to become:
1.shard_<op>.infocache.hit
cache hits with infocache.
2.shard_<op>.cache.hit
cache hits with memcache.
3.shard_<op>.cache.[miss|bypass|skip|force_skip|disabled|error]
.<status_int>
Those are operations made to backend due to below reasons.
miss: cache misses.
bypass: metadata didn't support a cache lookup
skip: the selective skips per skip percentage config.
force_skip: the request with 'x-newest' header.
disabled: memcache is disabled.
error: memcache connection error.
For each kind of operation metrics, suffix <status_int> will
count operations with different status. Then a sum of all
status sub-metrics will the total metrics of that operation.
UpgradeImpact
=============
Metrics dashboard will need updates to display those changed metrics
correctly, also infocache metrics are newly added, please see above
message for all changes needed.
Co-Authored-By: Clay Gerrard <clay.gerrard@gmail.com>
Change-Id: Ib8be30d3969b4b4808664c43e94db53d10e6ef4c
2f32d07707