Modify an existing alert and re-arm it.

Available to: All authenticated users

Environments: Demo, Live

Rate Limit: No endpoint-specific limit

Updates an existing Alert identified by alertId. The alert must belong to the calling user. The server re-parses the supplied expression before applying changes; on success it replaces the alert's expression, validUntil, triggerLimits, and message, resets the triggeredCounter and clears any failure, sets status back to Active, and resumes watching the condition. The response returns the updated alert.

Request fields:

• alertId (required) — the id of the alert to modify, from createAlert or alertItem.
• expression (required) — the new condition, up to 4096 characters.
• validUntil — optional new expiration time.
• triggerLimits — optional new trigger limit (0–10).
• message — optional new message text (up to 256 characters).

Because a modify resets the trigger counter and reactivates the alert, it is equivalent to a resetAlert that also changes the alert's parameters. If the new expression fails to parse, the existing alert is left unchanged and the response carries a non-empty errorText. If the parse succeeds but the update cannot be persisted, the server resumes watching the original alert and returns an errorText beginning with "Cannot apply changes:".

Common Failure Scenarios

• The new expression is malformed or references an unsupported condition.
• alertId does not exist or is not owned by the calling user.

Error Messages