memory: use aggregate()

Author: patapenka-alexey

dashboard/panels/runtime.libsonnet

@@ -41,8 +41,13 @@ local variable = import 'dashboard/variable.libsonnet';
   ).addTarget(
     if cfg.type == variable.datasource_type.prometheus then
       prometheus.target(
-        expr='sum(tnt_memory{job=~"$job"}) + sum(tnt_memory_virt{job=~"$job"})',
-        legendFormat='{{alias}}',
+        expr=std.format(
+          '%s + %s',
+          [
+            aggregate_expr(cfg, 'tnt_memory'),
+            aggregate_expr(cfg, 'tnt_memory_virt'),
+          ]
+        ),
       )
     else if cfg.type == variable.datasource_type.influxdb then
       influxdb.target()
@@ -64,7 +69,10 @@ local variable = import 'dashboard/variable.libsonnet';
   ).addTarget(
     common.target(cfg, 'tnt_memory')
   ).addTarget(
-    common.target(cfg, 'sum(tnt_memory{job=~"$job"})'),
+    if cfg.type == variable.datasource_type.prometheus then
+      prometheus.target(expr=aggregate_expr(cfg, 'tnt_memory'),)
+    else if cfg.type == variable.datasource_type.influxdb then
+      influxdb.target()
   ),
 
   virt_memory(
@@ -83,7 +91,10 @@ local variable = import 'dashboard/variable.libsonnet';
   ).addTarget(
     common.target(cfg, 'tnt_memory_virt')
   ).addTarget(
-    common.target(cfg, 'sum(tnt_memory_virt{job=~"$job"})'),
+    if cfg.type == variable.datasource_type.prometheus then
+      prometheus.target(expr=aggregate_expr(cfg, 'tnt_memory_virt'),)
+    else if cfg.type == variable.datasource_type.influxdb then
+      influxdb.target()
   ),
 
   lua_memory(