Adds telemetry for metric-rollup

Signed-off-by: Harkishen-Singh <[email protected]>

Author: Harkishen-Singh

migration/idempotent/010-telemetry.sql

@@ -100,6 +100,13 @@ $$
         SELECT _prom_catalog.get_default_value('chunk_interval') INTO result;
         PERFORM _ps_catalog.apply_telemetry('metrics_default_chunk_interval', result);
 
+        -- Metric downsampling.
+        SELECT prom_api.get_automatic_downsample()::TEXT INTO result;
+        PERFORM _ps_catalog.apply_telemetry('metrics_automatic_downsampling_enabled', result);
+
+        SELECT array_agg(resolution || ':' || retention)::TEXT INTO result FROM _prom_catalog.rollup; -- Example: {00:05:00:720:00:00,01:00:00:8760:00:00} => {HH:MM:SS}
+        PERFORM _ps_catalog.apply_telemetry('metrics_automatic_downsampling_resolutions', result);
+
         IF ( SELECT count(*)>0 FROM _prom_catalog.metric WHERE metric_name = 'prometheus_tsdb_head_series' ) THEN
             -- Calculate active series in Promscale. This is done by taking the help of the Prometheus metric 'prometheus_tsdb_head_series'.
             -- An active series for Promscale is basically sum of active series of all Prometheus instances writing into Promscale