[jira] [Assigned] (AMBARI-8400) Alerts: Template Engine for Dispatching

["Jonathan Hurley (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/AMBARI-8400?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Jonathan Hurley reassigned AMBARI-8400:
---------------------------------------

    Assignee: Jonathan Hurley

> Alerts: Template Engine for Dispatching
> ---------------------------------------
>
>                 Key: AMBARI-8400
>                 URL: https://issues.apache.org/jira/browse/AMBARI-8400
>             Project: Ambari
>          Issue Type: Bug
>            Reporter: Jonathan Hurley
>            Assignee: Jonathan Hurley
>
> Ambari's various dispatchers (such as Email and SNMP) can benefit from having a mechanism where a template can be defined for the construction of notification data. This decouples the content that Ambari is sending from the logic to compute the aggregate alerts.
> Apache Velocity is a good choice for this requirement as it includes a maturing template language, VTL. 
> A single XML file that ships with Ambari will contain the default templates for known alert target types. There will be an option to override the use of this file with a user-specified location via ambari.properties. In the event that a user-specific XML file cannot be parsed, appropriate exceptions will be thrown, but the {{AlertNoticeDispatchService}} will attempt to gracefully fallback on other content rendering options (such as the internal XML file).
> The following data should be exposed to VTL:
> - a list of all alert changes
> -- alert name, state, date, label
> -- a list for each state change
> -- lists for all alerts, broke down by service and state 
> - a list of all services with an alert
> - a list of all hosts with an alert
> - total counts of changes separated
> -- one count for each alert state



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