[Hawkular-dev] Hawkular Metrics 0.21.0 - Release

[Stefan Negrea]

Hello Everybody,
I am happy to announce release 0.21.0 of Hawkular Metrics. This release is
anchored by performance enhancements and general fixes.

Here is a list of major changes:

   -

   Cassandra
   - *Cassandra 3.0.9 is now the supported version of Cassandra.*
      - Note: this is a rollback from previously supported version of 3.7
      due to Cassandra community recommendations for stability and production
      deployment. Cassandra 3.7 or 3.9 are still compatible but development and
      testing use 3.0.9 release.
   -

   Compression
   - Fixed an issue that allowed duplicate instances of the compression job
      to get scheduled on server restart (HWKMETRICS-492
      <https://issues.jboss.org/browse/HWKMETRICS-492>)
      - Improved the fault tolerance of the compression job (HWKMETRICS-494
      <https://issues.jboss.org/browse/HWKMETRICS-494>)
      - Improved the performance of the merge process for reading
      compressed data (HWKMETRICS-488
      <https://issues.jboss.org/browse/HWKMETRICS-488>)
      - Fixed wrong ordering when fetching compressed and uncompressed data
      (HWKMETRICS-506 <https://issues.jboss.org/browse/HWKMETRICS-506>)
      - Compression job provides back pressure (HWKMETRICS-500
      <https://issues.jboss.org/browse/HWKMETRICS-500>)
      - The job scheduler now handles failure scenarios (HWKMETRICS-505
      <https://issues.jboss.org/browse/HWKMETRICS-505>)
   -

   Cassandra Schema
   - Fixed an issue where the server can fail to start due to Cassalog
      being in inconsistent state (HWKMETRICS-495
      <https://issues.jboss.org/browse/HWKMETRICS-495>)
      - gc_grace_second is set to zero for single node clusters (
      HWKMETRICS-381 <https://issues.jboss.org/browse/HWKMETRICS-381>)
   -

   API Updates
   - Inserting data points has server side retries to increase the fault
      tolerance for simple error scenarios (HWKMETRICS-510
      <https://issues.jboss.org/browse/HWKMETRICS-510>)
      - fromEarliest parameter is now supported in all query endpoints (
      HWKMETRICS-445 <https://issues.jboss.org/browse/HWKMETRICS-445>)
   -

   Configuration
   - The configuration options did not have a consistent naming scheme.
      hawkular-metrics, hawkular.metrics, and hawkular prefixes were used
      along no prefixes.
      - In this release the naming schema has been standardized to
      hawkular.metrics.* for metrics specific configuration and hawkular.*
      for general configuration.
      - Here is list of all configuration options currently available:
      ConfigurationKey
      <https://github.com/hawkular/hawkular-metrics/blob/release/0.21.0/api/metrics-api-util/src/main/java/org/hawkular/metrics/api/jaxrs/config/ConfigurationKey.java#L29>
      - For more details: HWKMETRICS-508
      <https://issues.jboss.org/browse/HWKMETRICS-508>



*Hawkular Alerting - included*

   - Version 1.3.0
   <https://issues.jboss.org/projects/HWKALERTS/versions/12331985>
   - Project details and repository: Github
   <https://github.com/hawkular/hawkular-alerts>
   - Documentation: REST API Documentation
   <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/0.21.0

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/12331718

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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