Add cache control to metrics and health endpoints (2.x) #4257
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Resolves #4241 for 2.x
Health: Always add a cache-suppressing header to responses.
Metrics: Add a cache-suppressing header to responses containing or representing data (
GETandHEAD).OPTIONSrequests contains only metadata so they are (conceivably) more able to be reasonably cached so exclude the cache-suppressing header from those responses.