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, 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)
  • Jobs now execute on RxJava's I/O scheduler thread pool (HWKMETRICS-579)
• Administration
  • The admin tenant is now configurable via ADMIN_TENANT environment variable (HWKMETRICS-572)
  • Internal metric collection is disabled by default (HWKMETRICS-578)
  • Resolved a null pointer exception in DropWizardReporter due to admin tenant changes (HWKMETRICS-577)
• Job Scheduler
  • Resolved an issue where the compression job would stop running after a few days (HWKMETRICS-564)
  • Updated the job scheduler to renew job locks during job execution (HWKMETRICS-570)
  • Updated the job scheduler to reacquire job lock after server restarts (HWKMETRICS-583)
• Hawkular Alerting - Major Updates
  • Resolved several issues where schema upgrades were not applied after the initial schema install (HWKALERTS-220, HWKALERTS-222)