Decrease database instance collection interval (#17677)

Author: jmeunier28

mongo/datadog_checks/mongo/config.py

@@ -102,7 +102,7 @@ def __init__(self, instance, log):
 
         # DBM config options
         self.dbm_enabled = is_affirmative(instance.get('dbm', False))
-        self.database_instance_collection_interval = instance.get('database_instance_collection_interval', 1800)
+        self.database_instance_collection_interval = instance.get('database_instance_collection_interval', 300)
         self.cluster_name = instance.get('cluster_name', None)
         self._operation_samples_config = instance.get('operation_samples', {})