feat(schema/views): add hourly load aggregate, example union query

schema/grant/grafana.sql

@@ -5,4 +5,6 @@ GRANT SELECT ON metrics TO :role_name;
 -- crashing when it runs out of memory
 
 GRANT SELECT ON agg_instance_load TO :role_name;
+GRANT SELECT ON agg_instance_load_long TO :role_name;
+
 GRANT SELECT ON agg_instance_pods TO :role_name;

schema/query/history-load.sql

@@ -1,10 +1,44 @@
 SELECT
-  a.bucket AS time,
-  a.avg_load,
-  a.max_load,
-  REGEXP_REPLACE(l.labels->>'instance', '(.+):[0-9]+', '\1') AS instance
-FROM
-  agg_instance_load AS a
-JOIN
-  metric_labels AS l
-ON l.lid = a.lid;
+  l.labels->>'instance' AS metric,
+  s.time,
+  s.value
+FROM ((
+  SELECT
+    lid,
+    bucket AS time,
+    max_load AS value
+  FROM
+    agg_instance_load_long
+  WHERE bucket < NOW() - INTERVAL '1 day'
+  ORDER BY lid, bucket
+) UNION ALL (
+  SELECT
+    lid,
+    bucket AS time,
+    max_load AS value
+  FROM
+    agg_instance_load
+  WHERE bucket > NOW() - INTERVAL '1 day'
+  ORDER BY lid, bucket
+) UNION ALL (
+  SELECT
+    lid,
+    "tg" AS "time",
+    MAX("value") AS "value"
+  FROM (
+    SELECT
+      lid,
+      time_bucket(INTERVAL '1 minute', time) AS "tg",
+      value
+    FROM metrics
+    WHERE
+      time > NOW() - INTERVAL '15 minutes'
+      AND name = 'node_load1'
+      AND value != 'NaN'
+  ) t
+  GROUP BY lid, time
+  ORDER BY lid, time
+)) AS s
+JOIN metric_labels AS l
+ON l.lid = s.lid
+ORDER BY s.time, s.lid;

schema/views/instance-load.sql

@@ -2,13 +2,29 @@ CREATE VIEW agg_instance_load
 WITH (
   timescaledb.continuous,
   timescaledb.refresh_interval = '5m',
-  timescaledb.refresh_lag = '5m')
-AS SELECT
+  timescaledb.refresh_lag = '5m'
+) AS SELECT
   lid,
   time_bucket('5 minutes', time) "bucket",
   AVG(value) AS "avg_load",
   MAX(value) AS "max_load"
 FROM metric_samples
 WHERE
   name = 'node_load1'
-GROUP BY lid, bucket;
+GROUP BY lid, bucket;
+
+
+CREATE VIEW agg_instance_load_long
+WITH (
+  timescaledb.continuous,
+  timescaledb.refresh_interval = '1h',
+  timescaledb.refresh_lag = '1h'
+) AS SELECT
+  lid,
+  time_bucket('1 hour', time) AS "bucket",
+  AVG(value) AS "avg_load",
+  MAX(value) AS "max_load"
+FROM metric_samples
+WHERE
+  name = 'node_load1'
+GROUP BY lid, bucket;