bundles/postfix: rework exporter for better usability

bundles/grafana/dashboard-rows/postfix.py

@@ -19,11 +19,9 @@ def dashboard_row_postfix(panel_id, node):
     |> range(start: v.timeRangeStart, stop: v.timeRangeStop)
     |> filter(fn: (r) =>
         r["_measurement"] == "postfix_queue" and
-        r["_field"] == "count" and
-        r["status"] == "{measurement}" and
+        r["_field"] == "{measurement}" and
         r["host"] == "{node.name}"
     )
-    |> rename(columns: {{_field: "{measurement}"}})
     |> aggregateWindow(every: v.windowPeriod, fn: mean, createEmpty: false)
     |> yield(name: "{measurement}")""",
             'resultFormat': 'time_series',