Added count_ps to timers

Author: mhr3

src/metric.c

@@ -182,6 +182,13 @@ histogram__sample(struct brubeck_metric *metric, brubeck_sample_cb sample, void
 		sample(key, hsample.count, opaque);
 	}
 
+	if (opaque != NULL){
+		struct brubeck_backend *backend = opaque;
+		WITH_SUFFIX(".count_ps") {
+			sample(key, hsample.count / (double)backend->sample_freq, opaque);
+		}
+	}
+
 	/* if there have been no metrics during this sampling period,
 	 * we don't need to report any of the histogram samples */
 	if (hsample.count == 0.0)