[mongo] gracefully fail on operation samples colleciton when node is in recovering mode

mongo/changelog.d/19080.fixed

@@ -0,0 +1,2 @@
+Fix crash in DBM operation samples collection when a node is in recovering mode.
+

mongo/datadog_checks/mongo/dbm/operation_samples.py

@@ -7,6 +7,7 @@
 from typing import List, Optional
 
 from bson import json_util
+from pymongo.errors import NotPrimaryError
 
 from datadog_checks.mongo.dbm.utils import (
     format_key_name,
@@ -107,6 +108,9 @@ def _should_collect_operation_samples(self) -> bool:
         if isinstance(deployment, ReplicaSetDeployment) and deployment.is_arbiter:
             self._check.log.debug("Skipping operation samples collection on arbiter node")
             return False
+        elif isinstance(deployment, ReplicaSetDeployment) and deployment.replset_state == 3:
+            self._check.log.debug("Skipping operation samples collection on node in recovering state")
+            return False
         return True
 
     def _get_operation_samples(self, now, databases_monitored: List[str]):
@@ -149,10 +153,16 @@ def _get_operation_samples(self, now, databases_monitored: List[str]):
                 continue
 
     def _get_current_op(self):
-        operations = self._check.api_client.current_op()
-        for operation in operations:
-            self._check.log.debug("Found operation: %s", operation)
-            yield operation
+        try:
+            operations = self._check.api_client.current_op()
+            for operation in operations:
+                self._check.log.debug("Found operation: %s", operation)
+                yield operation
+        except NotPrimaryError as e:
+            # If the node is not primary or secondary, for example node is in recovering state
+            # we could not run the $currentOp command to collect operation samples.
+            self._check.log.warning("Could not collect operation samples, node is not primary or secondary")
+            self._check.log.debug("Error details: %s", e)
 
     def _should_include_operation(self, operation: dict, databases_monitored: List[str]) -> bool:
         # Skip operations from db that are not configured to be monitored

mongo/tests/test_dbm_operation_samples.py

@@ -5,7 +5,9 @@
 import json
 import os
 
+import mock
 import pytest
+from pymongo.errors import NotPrimaryError
 
 from . import common
 from .common import HERE
@@ -105,3 +107,35 @@ def test_mongo_operation_samples_arbiter(aggregator, instance_arbiter, check, dd
 
     assert len(dbm_samples) == 0
     assert len(dbm_activities) == 0
+
+
+@mock_now(1715911398.1112723)
+@common.shard
+def test_mongo_operation_samples_not_primary(
+    aggregator, instance_integration_cluster_autodiscovery, check, dd_run_check
+):
+    instance_integration_cluster_autodiscovery['dbm'] = True
+    instance_integration_cluster_autodiscovery['operation_samples'] = {'enabled': True, 'run_sync': True}
+    instance_integration_cluster_autodiscovery['slow_operations'] = {'enabled': False}
+    instance_integration_cluster_autodiscovery['schemas'] = {'enabled': False}
+
+    mongo_check = check(instance_integration_cluster_autodiscovery)
+    with mock_pymongo("standalone"):
+        with mock.patch(
+            'datadog_checks.mongo.api.MongoApi.current_op', new_callable=mock.PropertyMock
+        ) as mock_current_op:
+            mock_current_op.side_effect = NotPrimaryError("node is recovering")
+            aggregator.reset()
+            run_check_once(mongo_check, dd_run_check)
+
+    dbm_activities = aggregator.get_event_platform_events("dbm-activity")
+    activity_samples = [event for event in dbm_activities if event['dbm_type'] == 'activity']
+    assert activity_samples is not None
+    assert len(activity_samples[0]['mongodb_activity']) == 0
+
+    aggregator.reset()
+    mongo_check.deployment_type.replset_state = 3
+    run_check_once(mongo_check, dd_run_check)
+    dbm_activities = aggregator.get_event_platform_events("dbm-activity")
+    activity_samples = [event for event in dbm_activities if event['dbm_type'] == 'activity']
+    assert len(activity_samples) == 0