add short doc on the GET status API to the readme

x-pack/plugins/alerts/README.md

@@ -26,6 +26,7 @@ Table of Contents
 		- [`GET /api/alerts/_find`: Find alerts](#get-apialertfind-find-alerts)
 		- [`GET /api/alerts/alert/{id}`: Get alert](#get-apialertid-get-alert)
 		- [`GET /api/alerts/alert/{id}/state`: Get alert state](#get-apialertidstate-get-alert-state)
+		- [`GET /api/alerts/alert/{id}/status`: Get alert status](#get-apialertidstate-get-alert-status)
 		- [`GET /api/alerts/list_alert_types`: List alert types](#get-apialerttypes-list-alert-types)
 		- [`PUT /api/alerts/alert/{id}`: Update alert](#put-apialertid-update-alert)
 		- [`POST /api/alerts/alert/{id}/_enable`: Enable an alert](#post-apialertidenable-enable-an-alert)
@@ -504,6 +505,23 @@ Params:
 |---|---|---|
 |id|The id of the alert whose state you're trying to get.|string|
 
+### `GET /api/alerts/alert/{id}/status`: Get alert status
+
+Similar to the `GET state` call, but collects additional information from
+the event log.
+
+Params:
+
+|Property|Description|Type|
+|---|---|---|
+|id|The id of the alert whose state you're trying to get.|string|
+
+Query:
+
+|Property|Description|Type|
+|---|---|---|
+|dateStart|The date to start looking for alert events in the event log. Either an ISO date string, or a duration string indicating time since now.|string|
+
 ### `GET /api/alerts/list_alert_types`: List alert types
 
 No parameters.