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From "Jonathan Hurley (JIRA)" <>
Subject [jira] [Created] (AMBARI-8400) Alerts: Template Engine for Dispatching
Date Thu, 20 Nov 2014 18:02:34 GMT
Jonathan Hurley created AMBARI-8400:

             Summary: Alerts: Template Engine for Dispatching
                 Key: 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,

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 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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