Query and monitor if we have skipped any scheduled jobs

airbyte-metrics/metrics-lib/src/main/java/io/airbyte/metrics/lib/MetricQueries.java

@@ -148,4 +148,49 @@ public static List<Pair<JobStatus, Double>> overallJobRuntimeForTerminalJobsInLa
     return pairedRes;
   }
 
+  /*
+   * A connection that is not running on schedule is defined in last 24 hours if the number of runs
+   * are not matching with the number of expected runs according to the schedule settings. Refer to
+   * playbook for detailed discussion.
+   */
+  public static Long numOfJobsNotRunningOnSchedule(final DSLContext ctx) {
+    final var countField = "cnt";
+    final var query = """
+                      SELECT count(1) as cnt FROM ((
+                      	SELECT
+                      		c.id,
+                      		count(*) as cnt
+                      	FROM
+                      		connection c
+                      	LEFT JOIN Jobs j ON j.scope::uuid = c.id
+                      	WHERE
+                      		c.schedule IS NOT null
+                      		AND c.schedule != 'null'
+                      		AND j.created_at > now() - interval '24 hours 1 minutes'
+                      		AND c.status = 'active'
+                      		AND j.config_type = 'sync'
+                      		AND c.updated_at < now() - interval '24 hours 1 minutes'
+                      		AND cast(c.schedule::jsonb->'timeUnit' as text) = '"hours"'
+                      	GROUP BY 1
+                      	HAVING count(*) < 24 / cast(c.schedule::jsonb->'units' as integer))
+                      UNION (
+                      SELECT
+                      	c.id,
+                      	count(*) as cnt
+                      FROM connection c
+                      LEFT JOIN Jobs j ON j.scope::uuid = c.id
+                      WHERE
+                      	c.schedule IS NOT null
+                      	AND c.schedule != 'null'
+                      	AND j.created_at > now() - interval '1 hours 1 minutes'
+                      	AND c.status = 'active'
+                      	AND j.config_type = 'sync'
+                      	AND c.updated_at < now() - interval '1 hours 1 minutes'
+                      	AND cast(c.schedule::jsonb->'timeUnit' as text) = '"minutes"'
+                      GROUP BY 1
+                      HAVING count(*) < 60 / cast(c.schedule::jsonb->'units' as integer))) as abnormal_sync_jobs
+                      	""";
+    return ctx.fetch(query).getValues(countField, long.class).get(0).longValue();
+  }
+
 }

airbyte-metrics/metrics-lib/src/main/java/io/airbyte/metrics/lib/OssMetricsRegistry.java

@@ -87,6 +87,10 @@ public enum OssMetricsRegistry implements MetricsRegistry {
       MetricEmittingApps.METRICS_REPORTER,
       "num_active_conn_per_workspace",
       "number of active connections per workspace"),
+  NUM_ABNORMAL_SCHEDULED_SYNCS(
+      MetricEmittingApps.METRICS_REPORTER,
+      "num_abnormal_scheduled_syncs",
+      "number of abnormal syncs that have skipped at least 1 scheduled run recently."),
   OLDEST_PENDING_JOB_AGE_SECS(MetricEmittingApps.METRICS_REPORTER,
       "oldest_pending_job_age_secs",
       "oldest pending job in seconds"),

airbyte-metrics/reporter/src/main/java/io/airbyte/metrics/reporter/ToEmit.java

@@ -49,6 +49,10 @@ public enum ToEmit {
       MetricClientFactory.getMetricClient().distribution(OssMetricsRegistry.NUM_ACTIVE_CONN_PER_WORKSPACE, count);
     }
   })),
+  NUM_ABNORMAL_SCHEDULED_SYNCS(countMetricEmission(() -> {
+    final var count = ReporterApp.configDatabase.query(MetricQueries::numOfJobsNotRunningOnSchedule);
+    MetricClientFactory.getMetricClient().gauge(OssMetricsRegistry.NUM_ABNORMAL_SCHEDULED_SYNCS, count);
+  })),
   OVERALL_JOB_RUNTIME_IN_LAST_HOUR_BY_TERMINAL_STATE_SECS(countMetricEmission(() -> {
     final var times = ReporterApp.configDatabase.query(MetricQueries::overallJobRuntimeForTerminalJobsInLastHour);
     for (Pair<JobStatus, Double> pair : times) {