xpack.encryptedSavedObjects.encryptionKey

A string of 32 or more characters used to encrypt sensitive properties on alerts and actions before they’re stored in Elasticsearch. Third party credentials — such as the username and password used to connect to an SMTP service — are an example of encrypted properties.

If not set, Kibana will generate a random key on startup, but all alert and action functions will be blocked. Generated keys are not allowed for alerts and actions because when a new key is generated on restart, existing encrypted data becomes inaccessible. For the same reason, alerts and actions in high-availability deployments of Kibana will behave unexpectedly if the key isn’t the same on all instances of Kibana.

Although the key can be specified in clear text in kibana.yml, it’s recommended to store this key securely in the Kibana Keystore.

xpack.actions.whitelistedHosts

A list of hostnames that Kibana is allowed to connect to when built-in actions are triggered. It defaults to [], allowing any host, but keep in mind the potential for SSRF attacks when hosts are not explicitly whitelisted. An empty list [] can be used to block built-in actions from making any external connections.

Note that hosts associated with built-in actions, such as Slack and PagerDuty, are not automatically whitelisted. If you are not using the default [] setting, you must ensure that the corresponding endpoints are whitelisted as well.

xpack.actions.enabledActionTypes

A list of action types that are enabled. It defaults to [*], enabling all types. The names for built-in Kibana action types are prefixed with a . and include: .server-log, .slack, .email, .index, .pagerduty, and .webhook. An empty list [] will disable all action types.

Disabled action types will not appear as an option when creating new connectors, but existing connectors and actions of that type will remain in Kibana and will not function.