[Hawkular-dev] Hawkular Metrics 0.19.0 - Release

[Stefan Negrea]

Hello Everybody,
I am happy to announce release 0.19.0 of Hawkular Metrics.This release is
anchored by performance enhancements and a lot of REST API enhancements.

Here is a list of major changes:

   1.

   *REST API - Query Improvements*
   - It is now possible to use relative timestamps when querying for data
      via `+` or `-` added to timestamp parameters. When used, the
      timestamp is relative to the local system timestamp (HWKMETRICS-358
      <https://issues.jboss.org/browse/HWKMETRICS-358>, HWKMETRICS-457
      <https://issues.jboss.org/browse/HWKMETRICS-457>)
      - Querying for data from earliest available data point has been
      expanded to raw data queries for gauges and counters (HWKMETRICS-435
      <https://issues.jboss.org/browse/HWKMETRICS-435>)
      - `DELETE tenants/{id}` has been added to allow the deletion of an
      entire tenant (HWKMETRICS-446
      <https://issues.jboss.org/browse/HWKMETRICS-446>)
      - AvailabilityType is serialized as simple string in bucket data
      points (HWKMETRICS-436
      <https://issues.jboss.org/browse/HWKMETRICS-436>)
   2.

   *Performance Enhancements*
   - The write performance has been increased by 10% across the board after
      reorganizing the meta-data internal indexes. (HWKMETRICS-422
      <https://issues.jboss.org/browse/HWKMETRICS-422>)
      - GZIP replaced LZ4 as the compression algorithm for the data table.
      This produces anywhere between 60% to 70% disk usage savings over LZ4. (
      HWKMETRICS-454 <https://issues.jboss.org/browse/HWKMETRICS-454>)
   3.

   *Job Scheduler - Improvements*
   - The newly introduced internal job scheduler received several
      improvements and fixes; the main focus was to enhance the scalability and
      fault tolerance.
      - The job scheduler will be used only for internal tasks.
      - For more details: HWKMETRICS-221
      <https://issues.jboss.org/browse/HWKMETRICS-221>, HWKMETRICS-451
      <https://issues.jboss.org/browse/HWKMETRICS-451>, HWKMETRICS-453
      <https://issues.jboss.org/browse/HWKMETRICS-453>, HWKMETRICS-94
      <https://issues.jboss.org/browse/HWKMETRICS-94>


*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/0.19.0

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

Jira release tracker:
https://issues.jboss.org/browse/HWKMETRICS/fixforversion/12331192


A big "Thank you" goes to John Sanda, Thomas Segismont, Mike Thompson, Matt
Wringe, Michael Burman, Joel Takvorian, and Heiko Rupp for their project
contributions.


Thank you,
Stefan Negrea
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