fix examples queries: change idle process metric name in order not to override built-in pg_stat_activity.

Signed-off-by: Cédric de Saint Martin <cdesaintmartin@wiremind.fr>

queries.yaml

@@ -229,7 +229,7 @@ pg_stat_statements:
         usage: "COUNTER"
         description: "Total time the statement spent writing blocks, in milliseconds (if track_io_timing is enabled, otherwise zero)"
 
-pg_stat_activity:
+pg_process_idle:
   query: |
     WITH
       metrics AS (
@@ -259,16 +259,16 @@ pg_stat_activity:
       )
     SELECT
       application_name,
-      process_idle_seconds_sum,
-      process_idle_seconds_count,
-      ARRAY_AGG(le) AS process_idle_seconds,
-      ARRAY_AGG(bucket) AS process_idle_seconds_bucket
+      process_idle_seconds_sum as seconds_sum,
+      process_idle_seconds_count as seconds_count,
+      ARRAY_AGG(le) AS seconds,
+      ARRAY_AGG(bucket) AS seconds_bucket
     FROM metrics JOIN buckets USING (application_name)
     GROUP BY 1, 2, 3
   metrics:
     - application_name:
         usage: "LABEL"
         description: "Application Name"
-    - process_idle_seconds:
+    - seconds:
         usage: "HISTOGRAM"
         description: "Idle time of server processes"