[MEDIUM] stats: split frontend and backend stats
It's very annoying that frontend and backend stats are merged because we
don't know what we're observing. For instance, if a "listen" instance
makes use of a distinct backend, it's impossible to know what the bytes_out
means.
Some points take care of not updating counters twice if the backend points
to the frontend, indicating a "listen" instance. The thing becomes more
complex when we try to add support for server side keep-alive, because we
have to maintain a pointer to the backend used for last request, and to
update its stats. But we can't perform such comparisons anymore because
the counters will not match anymore.
So in order to get rid of this situation, let's have both frontend AND
backend stats in the "struct proxy". We simply update the relevant ones
during activity. Some of them are only accounted for in the backend,
while others are just for frontend. Maybe we can improve a bit on that
later, but the essential part is that those counters now reflect what
they really mean.
diff --git a/include/types/proxy.h b/include/types/proxy.h
index 95736b1..6208d7b 100644
--- a/include/types/proxy.h
+++ b/include/types/proxy.h
@@ -297,7 +297,8 @@
*rsp_cap_pool;
struct pool_head *hdr_idx_pool; /* pools of pre-allocated int* used for headers indexing */
struct list req_add, rsp_add; /* headers to be added */
- struct pxcounters counters; /* statistics counters */
+ struct pxcounters be_counters; /* backend statistics counters */
+ struct pxcounters fe_counters; /* frontend statistics counters */
struct stktable table; /* table for storing sticking sessions */