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

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

Jonathan Hurley created AMBARI-8400:
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             Summary: 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


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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