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12c3ffbb48
cps_max (max new connections received per second), sps_max (max new
sessions per second) and http.rps_max (maximum new http requests per
second) all rely on shared counters (namely conn_per_sec, sess_per_sec and
http.req_per_sec). The problem is that shared counters are about to be
distributed over thread groups, and we cannot afford to compute the
total (for all thread groups) each time we update the max counters.
Instead, since such max counters (relying on shared counters) are a very
few exceptions, let's add internal (sess,conn,req) per sec freq counters
that are dedicated to cps_max, sps_max and http.rps_max computing.
Thanks to that, related *_max counters shouldn't be negatively impacted
by the thread-group distribution, yet they will not benefit from it
either. Related internal freq counters are prefixed with "_" to emphasize
the fact that they should not be used for other purpose (the shared ones,
which are about to be distributed over thread groups in upcoming commits
are still available and must be used instead). The internal ones could
eventually be removed at any time if we find another way to compute the
{cps,sps,http.rps)_max counters.
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