[jira] [Created] (AMBARI-4253) API improvements for exposing alert info

["Nate Cole (JIRA)" <ji...@apache.org>]

Nate Cole created AMBARI-4253:
---------------------------------

             Summary: API improvements for exposing alert info
                 Key: AMBARI-4253
                 URL: https://issues.apache.org/jira/browse/AMBARI-4253
             Project: Ambari
          Issue Type: Task
          Components: controller
            Reporter: Nate Cole
            Assignee: Nate Cole
             Fix For: 1.5.0


Currently, alerts are exposed via the API from the Nagios Server host component.
The component returns the "nagios_alerts" attribute, which contains the alert info for all the services and hosts. 
This "nagios_alerts" object can be potentially huge depending on the number of hosts, and the client code needs to parse and rollup the info for all alerts.  This is expensive and causes the UI to freeze every time "nagios_alerts" is updated from the server.

Here's what the UI needs from the API:

1. Provide ability to get alerts by host
2. Provide ability to get alerts by service
3. Expose # of warn/critical alerts for the Service resource (rollup)
4. Expose # of warn/critical alerts for the Host resource (rollup)

Solution will make an alerts structure part of the services and hosts and points.  Samples:
{noformat}
GET /api/v1/clusters/c1/hosts?fields=alerts
GET /api/v1/clusters/c1/hosts?fields=alerts/summary
GET /api/v1/clusters/c1/hosts?fields=alerts/detail
GET /api/v1/clusters/c1/services?fields=alerts
GET /api/v1/clusters/c1/services?fields=alerts/summary
GET /api/v1/clusters/c1/services?fields=alerts/detail
{noformat}

Expanded sample:
{noformat}
GET /api/v1/clusters/c1/hosts?fields=alerts
{
  "href" : "...",
  "items" : [
    {
      "href" : "http://localhost:8080/api/v1/clusters/c1/hosts/h1",
      "Hosts" : {
        "cluster_name" : "c1",
        "host_name" : "h1"
      },
      "alerts" : {
        "summary" : {
          "CRITICAL" : 2,
          "OK" : 19,
          "WARNING" : 0
        },
      "detail" : [
        {
           "description" : "Ambari Agent process",
           "host_name" : "h1",
           "last_status" : "OK",
           "last_status_time" : 1389125372,
           "service_name" : "AMBARI",
           "status" : "OK",
           "status_time" : 1389300812,
           "output" : "TCP OK - 0.000 second response time on port 8670"
         }, ...
       ]
      }
    },
    ...
}
{noformat}



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