Changed blk_write_time in (blk_read_time vs blk_write_time per call)

Author: dementii-priadko

config/grafana/dashboards/Dashboard_1_Node_performance_overview.json

@@ -1863,7 +1863,7 @@
           "expr": "sum(irate(pgwatch_pg_stat_statements_block_write_total{cluster='$cluster_name', node_name='$node_name', datname=\"$db_name\"}[$__rate_interval]))/sum(irate(pgwatch_pg_stat_statements_calls{cluster='$cluster_name', node_name='$node_name', datname=\"$db_name\"}[$__rate_interval]))",
           "hide": false,
           "interval": "20",
-          "legendFormat": "blk_read_time",
+          "legendFormat": "blk_write_time",
           "range": true,
           "refId": "B"
         }