diff --git a/core/metrics.c b/core/metrics.c
index b9e7d269..5ccdf647 100644
--- a/core/metrics.c
+++ b/core/metrics.c
@@ -982,6 +982,30 @@ static int64_t uwsgi_metric_collector_accumulator(struct uwsgi_metric *um) {
         return total;
 }
 
+static int64_t uwsgi_metric_collector_multiplier(struct uwsgi_metric *um) {
+        int64_t total = 0;
+        struct uwsgi_metric_child *umc = um->children;
+        while(umc) {
+                struct uwsgi_metric *c = umc->um;
+                total += *c->value;
+                umc = umc->next;
+        }
+
+        return total * um->arg1n;
+}
+
+static int64_t uwsgi_metric_collector_adder(struct uwsgi_metric *um) {
+        int64_t total = 0;
+        struct uwsgi_metric_child *umc = um->children;
+        while(umc) {
+                struct uwsgi_metric *c = umc->um;
+                total += *c->value;
+                umc = umc->next;
+        }
+
+        return total + um->arg1n;
+}
+
 static int64_t uwsgi_metric_collector_avg(struct uwsgi_metric *um) {
         int64_t total = 0;
 	int64_t count = 0;
@@ -1014,6 +1038,8 @@ void uwsgi_metrics_collectors_setup() {
 	uwsgi_register_metric_collector("file", uwsgi_metric_collector_file);
 	uwsgi_register_metric_collector("sum", uwsgi_metric_collector_sum);
 	uwsgi_register_metric_collector("accumulator", uwsgi_metric_collector_accumulator);
+	uwsgi_register_metric_collector("adder", uwsgi_metric_collector_adder);
+	uwsgi_register_metric_collector("multiplier", uwsgi_metric_collector_multiplier);
 	uwsgi_register_metric_collector("avg", uwsgi_metric_collector_avg);
 	uwsgi_register_metric_collector("func", uwsgi_metric_collector_func);
 }