[Hawkular-dev] Hawkular Metrics 0.24.0 - Release

[Stefan Negrea]

Hello,

I am happy to announce release 0.24.0 of Hawkular Metrics. This release is
anchored by a new tag query language and general stability improvements.

Here is a list of major changes:

   - *Tag Query Language*
      - A query language was added to support complex constructs for tag
      based queries for metrics
      - The old tag query syntax is deprecated but can still be used; the
      new syntax takes precedence
      - The new syntax supports:
         - logical operators: AND,OR
         - equality operators: =, !=
         - value in array operators: IN, NOT IN
         - existential conditions:
            - tag without any operator is equivalent to = '*'
            - tag preceded by the NOT operator matches only instances
            without the tag defined
         - all the values in between single quotes are treated as regex
         expressions
         - simple text values do not need single quotes
         - spaces before and after equality operators are not necessary
      - For more details please see: Pull Request 725
      <https://github.com/hawkular/hawkular-metrics/pull/725>,
      HWKMETRICS-523 <https://issues.jboss.org/browse/HWKMETRICS-523>
      - Sample queries:

           a1 = 'bcd' OR a2 != 'efg'
           a1='bcd' OR a2!='efg'
           a1 = efg AND ( a2 = 'hijk' OR a2 = 'xyz' )
           a1 = 'efg' AND ( a2 IN ['hijk', 'xyz'] )
           a1 = 'efg' AND a2 NOT IN ['hijk']
           a1 = 'd' OR ( a1 != 'ab' AND ( c1 = '*' ) )
           a1 OR a2
           NOT a1 AND a2
           a1 = 'a' AND NOT b2
           a1 = a AND NOT b2


   - *Performance*
      - Updated compaction strategies for data tables from size tiered
      compaction (STCS) to time window compaction (TWCS) (HWKMETRICS-556
      <https://issues.jboss.org/browse/HWKMETRICS-556>)
      - Jobs now execute on RxJava's I/O scheduler thread pool (
      HWKMETRICS-579 <https://issues.jboss.org/browse/HWKMETRICS-579>)
   - *Administration*
      - The admin tenant is now configurable via ADMIN_TENANT environment
      variable (HWKMETRICS-572
      <https://issues.jboss.org/browse/HWKMETRICS-572>)
      - Internal metric collection is disabled by default (HWKMETRICS-578
      <https://issues.jboss.org/browse/HWKMETRICS-578>)
      - Resolved a null pointer exception in DropWizardReporter due to
      admin tenant changes (HWKMETRICS-577
      <https://issues.jboss.org/browse/HWKMETRICS-577>)
   - *Job Scheduler*
      - Resolved an issue where the compression job would stop running
      after a few days (HWKMETRICS-564
      <https://issues.jboss.org/browse/HWKMETRICS-564>)
      - Updated the job scheduler to renew job locks during job execution (
      HWKMETRICS-570 <https://issues.jboss.org/browse/HWKMETRICS-570>)
      - Updated the job scheduler to reacquire job lock after server
      restarts (HWKMETRICS-583
      <https://issues.jboss.org/browse/HWKMETRICS-583>)
   - *Hawkular Alerting - Major Updates*
      - Resolved several issues where schema upgrades were not applied
      after the initial schema install (HWKALERTS-220
      <https://issues.jboss.org/browse/HWKALERTS-220>, HWKALERTS-222
      <https://issues.jboss.org/browse/HWKALERTS-222>)


*Hawkular Alerting - Included*

   - Version 1.5.1
   <https://issues.jboss.org/projects/HWKALERTS/versions/12333065>
   - Project details and repository: Github
   <https://github.com/hawkular/hawkular-alerts>
   - Documentation: REST API
   <http://www.hawkular.org/docs/rest/rest-alerts.html>, Examples
   <https://github.com/hawkular/hawkular-alerts/tree/master/examples>,
Developer
   Guide
   <http://www.hawkular.org/community/docs/developer-guide/alerts.html>

*Hawkular Metrics Clients*

   - Python: https://github.com/hawkular/hawkular-client-python
   - Go: https://github.com/hawkular/hawkular-client-go
   - Ruby: https://github.com/hawkular/hawkular-client-ruby
   - Java: https://github.com/hawkular/hawkular-client-java


*Release Links*

Github Release:
https://github.com/hawkular/hawkular-metrics/releases/tag/0.24.0

JBoss Nexus Maven artifacts:
http://origin-repository.jboss.org/nexus/content/repositorie
s/public/org/hawkular/metrics/

Jira release tracker:
https://issues.jboss.org/projects/HWKMETRICS/versions/12332966

A big "Thank you" goes to John Sanda, Matt Wringe, Michael Burman, Joel
Takvorian, Jay Shaughnessy, Lucas Ponce, and Heiko Rupp for their project
contributions.

Thank you,
Stefan Negrea
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