MEDIUM: session: maintain per-backend and per-server time statistics
Using the last rate counters, we now compute the queue, connect, response
and total times per server and per backend with a 95% accuracy over the last
1024 samples. The operation is cheap so we don't need to condition it.
diff --git a/include/common/defaults.h b/include/common/defaults.h
index bdd75cf..8d5d62a 100644
--- a/include/common/defaults.h
+++ b/include/common/defaults.h
@@ -219,4 +219,15 @@
#define SSL_DEFAULT_DH_PARAM 0
#endif
+/* Number of samples used to compute the times reported in stats. A power of
+ * two is highly recommended, and this value multiplied by the largest response
+ * time must not overflow and unsigned int. See freq_ctr.h for more information.
+ * We consider that values are accurate to 95% with two batches of samples below,
+ * so in order to advertise accurate times across 1k samples, we effectively
+ * measure over 512.
+ */
+#ifndef TIME_STATS_SAMPLES
+#define TIME_STATS_SAMPLES 512
+#endif
+
#endif /* _COMMON_DEFAULTS_H */