[jira] [Created] (TS-3220) Update http cache stats so we can determine if a response was served from ram cache

["Bryan Call (JIRA)" <ji...@apache.org>]

Bryan Call created TS-3220:
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             Summary: Update http cache stats so we can determine if a response was served from ram cache
                 Key: TS-3220
                 URL: https://issues.apache.org/jira/browse/TS-3220
             Project: Traffic Server
          Issue Type: Improvement
            Reporter: Bryan Call


Currently we use a combination of ram cache stats and some http ram cache information to try to determine if the response was served from ram cache.  The ram cache stats don't know about http and the entry in ram cache might not be valid, so it is possible to have a ram cache hit from the cache's point of view, but not serve the response from cache at all.

The http cache stats are missing a few stats to determine if the response was served from ram.  We would need to add stat form ims response was served from ram {{proxy.process.http.cache_hit_mem_ims}} and a stat if the stale response was served from ram {{proxy.process.http.cache_hit_mem_stale_served}}.

Ram cache stats for reference
{code}
proxy.process.cache.ram_cache.hits
proxy.process.cache.ram_cache.misses
{code}

Current http cache stats for reference
{code}
proxy.process.http.cache_hit_fresh
proxy.process.http.cache_hit_mem_fresh
proxy.process.http.cache_hit_revalidated
proxy.process.http.cache_hit_ims
proxy.process.http.cache_hit_stale_served
proxy.process.http.cache_miss_cold
proxy.process.http.cache_miss_changed
proxy.process.http.cache_miss_client_no_cache
proxy.process.http.cache_miss_client_not_cacheable
proxy.process.http.cache_miss_ims
{code}





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