overview dashboard: Show offending instance in error log rate graph

monitoring/dashboards/overview.json

@@ -353,9 +353,9 @@
           "targets": [
             {
               "intervalFactor": 1, 
-              "expr": "sum(irate(log_count_total{level!=\"INFO\"}[2m])) by (job, level, module, function) > 0\n", 
+              "expr": "sum(irate(log_count_total{level!=\"INFO\"}[2m])) by (instance, job, level, module, function) > 0\n", 
               "refId": "A", 
-              "legendFormat": "{{job}} {{level}}({{module}}:{{function}})", 
+              "legendFormat": "{{instance}} {{job}} {{level}}({{module}}:{{function}})", 
               "format": "time_series"
             }
           ], 

monitoring/dashboards/overview.jsonnet

@@ -122,8 +122,8 @@ grafana.dashboard({
             axis: {min: 0, label: "logs / sec"},
             display: "bars",
             expressions: {
-              "{{job}} {{level}}({{module}}:{{function}})": |||
+              "{{instance}} {{job}} {{level}}({{module}}:{{function}})": |||
-                sum(irate(log_count_total{level!="INFO"}[2m])) by (job, level, module, function) > 0
+                sum(irate(log_count_total{level!="INFO"}[2m])) by (instance, job, level, module, function) > 0
               |||,
             },
           },