Red Hat NETWORK 4.0.5 - Guía de instalación descargar pdf (Pagina 25)

triggered.

Result: New ceilometer-alarm-evaluator and ceilometer-alarm-

notifier services are provided.

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Feature: Partitioning of alarm evaluation over a horizontally

scaled out dynamic pool of workers.

Reason: This enhancement allows the evaluation workload to scale

up to encompass many alarms, and also avoids a singleton evaluator

becoming a single point of failure.

Result: The alarm.evaluation_service configuration option may be

set to ceilometer.alarm.service.PartitionedAlarmService, in which

case multiple ceilometer-alarm-evaluator service instances can be

started up on different hosts. These replicas will self-organize

and divide the evaluation workload among themselves via a group

co-ordination protocol based on fanout RPC.

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A feature has been added in OpenStack Metering (Ceilometer) which

allows the retention of alarm history in terms of lifecycle

events, rule changes and state transformations.

This was required because alarms encapsulate a transient state and

a snapshot of their current evaluation rule, but users also need

the capability of inspecting how the alarm state and rules

changed over a longer timespan, including the period after the

alarm no longer exists.

Now, alarm history is configurably retained for lifecycle events,

rule changes and state transformations.

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Feature: Aggregation of the states of multiple basic alarms into

overarching meta-alarms.

Reason: Reducing noise from detailed monitoring, also allowing

alarm-driven workflows (e.g. Heat autoscaling) to be gated by

more complex logical conditions.

Result: Combination alarms may be created to combine the states of

the under-pinning alarms via logical AND or OR.

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The main rootwrap implementation has been updated with new

filtering features. These new features:

* permit more maintainable filter rules with less duplication,

and

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Red Hat NETWORK 4.0.5 - Guía de instalación Pagina 25