First you need to get the ID of the alert definition in your system: curl -H "X-Requested-By: ambari" -u admin:<password> -X GET http://<ambari_host>:<ambari_port>/api/v1/clusters/<cluster_name>/alert_definitions?AlertDefinition/name=ambari_agent_disk_usage Get the alert definition with the id from prevoius step: curl -H "X-Requested-By: ambari" -u admin:<password> -X GET http://<ambari_host>:<ambari_port>/api/v1/clusters/<cluster_name>/alert_definitions/61 Set the new thresholds by changing the JSON alert definition: curl -H "X-Requested-By: ambari" -u admin:<password> -i -X PUT -d ' { "AlertDefinition":{ "cluster_name":"xyz", "component_name":"AMBARI_AGENT", "description":"This host-level alert is triggered if the amount of disk space used on a host goes above specific thresholds. The default values are 85% for WARNING and 90% for CRITICAL.", "enabled":true, "id":61, "ignore_host":false, "interval":1, "label":"Ambari Agent Disk Usage", "name":"ambari_agent_disk_usage", "scope":"HOST", "service_name":"AMBARI", "source":{ "parameters":[ { "name":"minimum.free.space", "display_name":"Minimum Free Space", "units":"bytes", "value":1.0E9, "description":"The overall amount of free disk space left before an alert is triggered.", "type":"NUMERIC", "threshold":"WARNING" }, { "name":"percent.used.space.warning.threshold", "display_name":"Warning", "units":"%", "value":0.85, "description":"The percent of disk space consumed before a warning is triggered.", "type":"PERCENT", "threshold":"WARNING" }, { "name":"percent.free.space.critical.threshold", "display_name":"Critical", "units":"%", "value":0.9, "description":"The percent of disk space consumed before a critical alert is triggered.", "type":"PERCENT", "threshold":"CRITICAL" } ], "path":"alert_disk_space.py", "type":"SCRIPT" } } }' http://<ambari_host>:<ambari_port>/api/v1/clusters/<cluster_name>/alert_definitions/61 Ambari API Reference: https://github.com/apache/ambari/blob/trunk/ambari-server/docs/api/v1/index.md ... View more