Add a counter for "killed from waiting list"

bin/varnishd/cache/cache_hash.c

@@ -539,7 +539,9 @@ hsh_rush(struct worker *wrk, struct objhead *oh)
 			 * In case of overloads, we ditch the entire
 			 * waiting list.
 			 */
+			wrk->stats->busy_wakeup--;
 			while (1) {
+				wrk->stats->busy_killed++;
 				AN (req->vcl);
 				VCL_Rel(&req->vcl);
 				sp = req->sp;

include/tbl/vsc_f_main.h

@@ -293,6 +293,12 @@ VSC_F(busy_wakeup,		uint64_t, 1, 'c', info,
 	" and rescheduled."
 )
 
+VSC_F(busy_killed,		uint64_t, 1, 'c', info,
+    "Number of requests killed after sleep on busy objhdr",
+	"Number of requests killed from the busy object sleep list"
+	" due to lack of resources."
+)
+
 VSC_F(sess_queued,		uint64_t, 0, 'c', info,
     "Sessions queued for thread",
 	"Number of times session was queued waiting for a thread."