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Date: Thu, 11 Dec 2014 05:02:12 +0000 (UTC)
From: "Jonathan Hurley (JIRA)" <jira@apache.org>
To: dev@ambari.apache.org
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Subject: [jira] [Commented] (AMBARI-8623) Alert Host Count Summary Exposed
 Via Cluster Endpoint
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    [ https://issues.apache.org/jira/browse/AMBARI-8623?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14242156#comment-14242156 ] 

Jonathan Hurley commented on AMBARI-8623:
-----------------------------------------

The final format was

{noformat}
{
  "href" : "http://localhost:8080/api/v1/clusters/c1?fields=alerts_summary_hosts",
  "Clusters" : {
    "cluster_name" : "c1",
    "version" : "HDP-2.2"
  },
  "alerts_summary_hosts" : {
    "CRITICAL" : 2,
    "OK" : 1,
    "UNKNOWN" : 0,
    "WARNING" : 1
  }
}
{noformat}

Where the sum of all of the values will always be the total number of hosts. In the above example, there are 2 hosts whose most severe alert is CRITICAL, there is a single host whose most severe alert is WARNING, and there is a single host with all alerts OK.

> Alert Host Count Summary Exposed Via Cluster Endpoint
> -----------------------------------------------------
>
>                 Key: AMBARI-8623
>                 URL: https://issues.apache.org/jira/browse/AMBARI-8623
>             Project: Ambari
>          Issue Type: Task
>          Components: alerts, ambari-server
>    Affects Versions: 2.0.0
>            Reporter: Jonathan Hurley
>            Assignee: Jonathan Hurley
>             Fix For: 2.0.0
>
>         Attachments: AMBARI-8623.patch
>
>
> In Ambari-1.7.0 the cluster endpoint used to have a summary of host-counts by severity. We need such a field in Ambari-2.0.0.
> {code}
> alerts: {
>  summary: {
>   CRITICAL: 1,
>   OK: 4,
>   PASSIVE: 0,
>   WARNING: 0
>  }
> }
> {code}
> The alerts_summary structure currently returned by the 2.0.0 API are the summary counts of alerts in the system, not those of the hosts. There are alerts that don't have a host (such as aggregate alerts). 
> In order to expose the host alert count, there are two ways to do this:
> 1) Add a new field to the cluster endpoint; something like {{alerts_host_summary}}
> {noformat}
> http://localhost:8080/api/v1/clusters/c1?fields=alerts_host_summary
> {
>   "href" : "http://localhost:8080/api/v1/clusters/c1?fields=alerts_host_summary",
>   "Clusters" : {
>     "cluster_name" : "c1",
>     "version" : "HDP-2.2"
>   },
>   "alerts_host_summary" : {
>     "CRITICAL" : 1,
>     "OK" : 41,
>     "UNKNOWN" : 0,
>     "WARNING" : 0
>   }
> }
> {noformat}
> 2) Provide a new formatter to display the alerts formatted by host:
> {noformat}
> http://localhost:8080/api/v1/clusters/c1/alerts?format=hostSummary
> {
>   "href" : "http://localhost:8080/api/v1/clusters/c1/alerts?format=hostSummary",
>   "alerts_summary" : {
>     "CRITICAL" : {
>       "count" : 1,
>       "original_timestamp" : 1418150735812
>     },
>     "OK" : {
>       "count" : 41,
>       "original_timestamp" : 1418151145325
>     },
>     "UNKNOWN" : {
>       "count" : 0,
>       "original_timestamp" : 0
>     },
>     "WARNING" : {
>       "count" : 0,
>       "original_timestamp" : 0
>     }
>   }
> }
> {noformat}


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