Hawkular - Hawkular Metrics 0.25.0

I am happy to announce release 0.25.0 of Hawkular Metrics. This release is anchored by general stability improvements and enhanced query capabilities for the external metrics alerter.

Here is a list of major changes:

External Metrics Alerter - Enhancements
- Both syntax and query capabilities have been revamped to allow defining conditions using flexible expressions with embedded stats queries
- The ExternalCondition expression is now JSON and has support for the new tag query language
- The full documentation about this feature can be found in the Alerting section of the user guide
- For more details please see: HWKMETRICS-566 and Pull Request 727
Dropwizard-Metrics - Merged
- The Dropwizard-Metrics reporter has been merged into the Metrics repository in clients/dropwizard module
- The old repository is decommissioned, all new development will happen in the Metrics project
- This was done to simplify the compatibility matrix between the reporter and Hawkular Metrics REST API; going forward they will have identical versions. Furthermore, the compatibility is now tested via continuous integration tests.
- Please use the new maven artifact hawkular-dropwizard-reporter
- For more details please see: HWKMETRICS-585
Tag Query Language - Enhancements
- The tag query language now supports the dot character in the tag name. The list of allowed characters is a-zA-Z_0-9.
- The query language allows regex matching for tag values but not tag names
- This allows translating JSON-like tag structures into Hawkular Metrics tags and query using the new tag query language
- For example, a tag structure like [tag.subtag1: value1, tag.subtag2.subsubtag1: value2] is now queriable via the tag query language with queries like tag.subtag1 = value1 or tag.subtag2.subsubtag1
- For more details please see: HWKMETRICS-611
REST API - Request Logging
- It is now possible to enable detailed logging for all REST API requests
- Two properties have been added to enable this features: hawkular.metrics.request.logging.level to enable logging for all read requests and hawkular.metrics.request.logging.level.writes to enable logging for write requests
- By default this feature is disabled, to enable just set the log level via each property
- For more details please see: HWKMETRICS-589
- Here is a sample log:

INFO  [org.hawkular.metrics.api.jaxrs.util.RequestLoggingFilter] (default task-49)
REST API request:
--------------------------------------
path: /metrics
segments: [metrics]
method: GET
query parameters: {type=[availability]}
Tenant: T9a116f18-28cf-41b3-8ff8-c9752ac60e26232

Other Updates
- Automatically fix schema issues that occur when the server is restarted during initial schema installation (HWKMETRICS-594)
- Metric data points inserts have been optimized to use token ranges for Cassandra writes (HWKMETRICS-599)

Hawkular Alerting - Included

Version 1.5.3
Project details and repository: Github
Documentation: REST API, Examples, Developer Guide

Hawkular Metrics Clients

Release Links

Github Release: https://github.com/hawkular/hawkular-metrics/releases/tag/0.25.0
JBoss Nexus Maven artifacts: http://origin-repository.jboss.org/nexus/content/repositories/public/org/hawkular/metrics/
Jira release tracker: https://issues.jboss.org/projects/HWKMETRICS/versions/12333676

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.

Published by Stefan Negrea on 07 March 2017

Hawkular Metrics 0.25.0 - Release

Release Links