[STATS] report HTTP requests (total and rate) in frontends

Now that we support keep-alive, it's important to report a separate
counter for requests. Right now it just appears in the CSV output.
diff --git a/include/proto/proxy.h b/include/proto/proxy.h
index 5297d08..288ca22 100644
--- a/include/proto/proxy.h
+++ b/include/proto/proxy.h
@@ -89,6 +89,15 @@
 		be->counters.be_sps_max = be->be_sess_per_sec.curr_ctr;
 }
 
+/* increase the number of cumulated requests on the designated frontend */
+static void inline proxy_inc_fe_req_ctr(struct proxy *fe)
+{
+	fe->counters.cum_fe_req++;
+	update_freq_ctr(&fe->fe_req_per_sec, 1);
+	if (fe->fe_req_per_sec.curr_ctr > fe->counters.fe_rps_max)
+		fe->counters.fe_rps_max = fe->fe_req_per_sec.curr_ctr;
+}
+
 #endif /* _PROTO_PROXY_H */
 
 /*
diff --git a/include/types/counters.h b/include/types/counters.h
index fa648a3..2b48207 100644
--- a/include/types/counters.h
+++ b/include/types/counters.h
@@ -25,9 +25,11 @@
 struct pxcounters {
 	unsigned int feconn_max, beconn_max;	/* max # of active frontend and backend sessions */
 
+	long long cum_fe_req;			/* cumulated number of processed HTTP requests */
 	long long cum_feconn, cum_beconn;	/* cumulated number of processed sessions */
 	long long cum_lbconn;			/* cumulated number of sessions processed by load balancing */
 
+	unsigned int fe_rps_max;		/* maximum of new sessions per second seen on the frontend */
 	unsigned int fe_sps_max;		/* maximum of new sessions per second seen on the frontend */
 	unsigned int be_sps_max;		/* maximum of new sessions per second seen on the backend */
 	unsigned int nbpend_max;		/* max number of pending connections with no server assigned yet */
diff --git a/include/types/proxy.h b/include/types/proxy.h
index fabc936..53c00f7 100644
--- a/include/types/proxy.h
+++ b/include/types/proxy.h
@@ -225,6 +225,7 @@
 	int nbpend;				/* number of pending connections with no server assigned yet */
 	int totpend;				/* total number of pending connections on this instance (for stats) */
 	unsigned int feconn, beconn;		/* # of active frontend and backends sessions */
+	struct freq_ctr fe_req_per_sec;		/* HTTP requests per second on the frontend */
 	struct freq_ctr fe_sess_per_sec;	/* sessions per second on the frontend */
 	struct freq_ctr be_sess_per_sec;	/* sessions per second on the backend */
 	unsigned int maxconn;			/* max # of active sessions on the frontend */