uses go_memstats_heap_inuse_bytes on the operational dashboard (#3447)

production/loki-mixin/dashboards/dashboard-loki-operational.json

@@ -2023,7 +2023,7 @@
           "steppedLine": false,
           "targets": [
             {
-              "expr": "container_memory_usage_bytes{cluster=\"$cluster\", namespace=\"$namespace\", pod=~\"distributor.*\"}",
+              "expr": "go_memstats_heap_inuse_bytes{cluster=\"$cluster\", namespace=\"$namespace\", pod=~\"distributor.*\"}",
               "instant": false,
               "intervalFactor": 3,
               "legendFormat": "{{pod}}",
@@ -2687,7 +2687,7 @@
           "steppedLine": false,
           "targets": [
             {
-              "expr": "container_memory_usage_bytes{cluster=\"$cluster\", namespace=\"$namespace\", pod=~\"ingester.*\"}",
+              "expr": "go_memstats_heap_inuse_bytes{cluster=\"$cluster\", namespace=\"$namespace\", pod=~\"ingester.*\"}",
               "instant": false,
               "intervalFactor": 3,
               "legendFormat": "{{pod}}",
@@ -3633,7 +3633,7 @@
           "steppedLine": false,
           "targets": [
             {
-              "expr": "container_memory_usage_bytes{cluster=\"$cluster\", namespace=\"$namespace\", pod=~\"querier.*\"}",
+              "expr": "go_memstats_heap_inuse_bytes{cluster=\"$cluster\", namespace=\"$namespace\", pod=~\"querier.*\"}",
               "instant": false,
               "intervalFactor": 3,
               "legendFormat": "{{pod}}",