fixing pg_stat_bgwriter counter metrics - _total suffix added (#20)

Author: gaantunes

postgres_mixin/dashboards/postgres-overview.json

@@ -631,7 +631,7 @@
             "uid": "$datasource"
           },
           "dsType": "prometheus",
-          "expr": "irate(pg_stat_bgwriter_buffers_alloc{job=~\"$job\",instance=~\"$instance\"}[$__rate_interval])",
+          "expr": "irate(pg_stat_bgwriter_buffers_alloc_total{job=~\"$job\",instance=~\"$instance\"}[$__rate_interval])",
           "format": "time_series",
           "groupBy": [
             {
@@ -686,7 +686,7 @@
             "uid": "$datasource"
           },
           "dsType": "prometheus",
-          "expr": "irate(pg_stat_bgwriter_buffers_backend_fsync{job=~\"$job\",instance=~\"$instance\"}[$__rate_interval])",
+          "expr": "irate(pg_stat_bgwriter_buffers_backend_fsync_total{job=~\"$job\",instance=~\"$instance\"}[$__rate_interval])",
           "format": "time_series",
           "groupBy": [
             {
@@ -741,7 +741,7 @@
             "uid": "$datasource"
           },
           "dsType": "prometheus",
-          "expr": "irate(pg_stat_bgwriter_buffers_backend{job=~\"$job\",instance=~\"$instance\"}[$__rate_interval])",
+          "expr": "irate(pg_stat_bgwriter_buffers_backend_total{job=~\"$job\",instance=~\"$instance\"}[$__rate_interval])",
           "format": "time_series",
           "groupBy": [
             {
@@ -796,7 +796,7 @@
             "uid": "$datasource"
           },
           "dsType": "prometheus",
-          "expr": "irate(pg_stat_bgwriter_buffers_clean{job=~\"$job\",instance=~\"$instance\"}[$__rate_interval])",
+          "expr": "irate(pg_stat_bgwriter_buffers_clean_total{job=~\"$job\",instance=~\"$instance\"}[$__rate_interval])",
           "format": "time_series",
           "groupBy": [
             {
@@ -851,7 +851,7 @@
             "uid": "$datasource"
           },
           "dsType": "prometheus",
-          "expr": "irate(pg_stat_bgwriter_buffers_checkpoint{job=~\"$job\",instance=~\"$instance\"}[$__rate_interval])",
+          "expr": "irate(pg_stat_bgwriter_buffers_checkpoint_total{job=~\"$job\",instance=~\"$instance\"}[$__rate_interval])",
           "format": "time_series",
           "groupBy": [
             {