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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