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v4.3.1: Jun 2024

This is minor maintenance release which only consists of dependency updates: metrics-core: 4.2.19 → 4.2.25, HdrHistogram 2.1.12 → 2.2.2, pekko 1.0.1 → 1.0.2.

v4.3.0: Aug 2023

  • Pekko support! Thanks to a contribution of @normana400.
  • Require at least java 11.
  • For Scala 3: require at least 3.3.0.
  • Updates: metrics-core: 4.2.9 → 4.2.19, akka: 2.6.19 → 2.6.20.

v4.2.9: Jun 2022

  • Push gauges are now backed by Dropwizard's settable gauges. This also means that creating a push gauge multiple times is now allowed and will return the first created gauge. Solves #405. @benwaffle, thanks for the pull request!
  • Updates: metrics-core: 4.2.7 → 4.2.9, akka: 2.6.18 → 2.6.19

v4.2.8: Dec 2021

  • Scala 3 support! Based on some very good work from @xuwei-k, thanks!
  • Introduced a version for Akka 2.6.
  • Updates: metrics-core: 4.1.29 → 4.2.7, hdrhistogram-metrics-reservoir: 1.1.0 → 1.1.3

v4.2.7: Dec 2021

This release misses some components, please use v4.2.8 instead.

v4.1.19: Apr 2021

  • Updates: metrics-core: 4.1.14 → 4.1.19.

v4.1.14: Nov 2020

  • Updates: metrics-core: 4.1.9 → 4.1.14.

v4.1.9: Jun 2020

  • Documented how to use metrics-scala with ZIO.
  • Updates: metrics-core: 4.1.5 → 4.1.9, Akka: 2.5.26 → 2.5.31.

v4.1.5: Mar 2020

  • New feature: push gauges.
  • Updates: metrics-core: 4.1.4 → 4.1.5

v4.1.4: Feb 2020

⚠️ This is a security release.

v4.1.1: Oct 2019

  • Though a lot of plumbing is in flux, there were no code changes.
  • Bumped version number to match Dropwizard's version (this should have happened in June already).
  • Updates: metrics-core: 4.1.0 → 4.1.1, Akka: 2.5.23 → 2.5.26.

v4.0.8: Jul 2019

  • Restrored pre- #117 behavior: metric base name can be empty again. This fixes #162, many thanks to @franzneubert0815 and @michaelarndt0423 for finding this regression.
  • Fixed typo in documentation. Thanks @eugenemedvediev!

v4.0.7: Jun 2019

  • No code changes.
  • Added scala 2.13.

v4.0.6: Jun 2019

  • No code changes.
  • Scaladoc improvements.
  • Updates: metrics-core 4.0.5 → 4.1.0, Akka: 2.5.22 → 2.5.23.
  • Added scala 2.13.0-RC3. Note: 2.13.0-RC3 is no longer supported, please use v4.0.7 for scala 2.13.

v4.0.5: May 2019

  • No code changes (except for tests).
  • Updates: Akka: 2.5.19 → 2.5.22.
  • Tests now use mockito-scala instead of mockito.
  • Added scala 2.13.0-RC1. Note: 2.13.0-RC1 is no longer supported, please use v4.0.7 for scala 2.13.

v4.0.4: Jan 2019

  • No code changes.
  • Updates: scala 2.12.7 → 2.12.8, dropwizard metrics: 4.0.3 → 4.0.5, HdrHistogram: 2.1.10 → 2.1.11, Akka: 2.5.18 → 2.5.19.
  • Added scala 2.13.0-M5. Note: 2.13.0-M5 is no longer supported, please use v4.0.7 for scala 2.13.

v4.0.3: Nov 2018

  • Fixed an (unlikely to happen) off-by-one error introduced in v4.0.2.
  • Deprecated the scope parameter in the metric builder so that it can be removed in v5.0.0.

v3.5.10: Nov 2018

  • Deprecated the scope parameter in the metric builder so that it can be removed in v5.0.0.

v4.0.2: Nov 2018

  • Drastic performance improvements for metric name generation. This is especially important for dynamically generated metric names. This improvement was authored by Filip Ochnik (@filipochnik). Thanks Filip! (#117)
  • Compiles against Scala 2.13 betas, metrics-scala is now part of the Scala community build.
  • Lots of dependency updates (also thanks to Scala Steward): Dropwizard metrics 4.0.1 → 4.0.3, Akka 2.5.8 → 2.5.18, HdrHistogram 2.1.9 → 2.1.10, Scala 2.12.4 → 2.12.7, Scalatest 3.0.4 → 3.0.5, Mockito 1.10.19 → 2.23.0.
  • Upgraded sbt from 1.0.4 to 1.2.6.

v4.0.1: Jan 2018

  • All code moved to the package nl.grons.metrics4.scala to prevent clashes with version 3.x. Except for the package name change, v4.0.1 is fully source compatible with v3.5.9.
  • Added trait FreshRegistries, FreshMetricRegistry and FreshHealthCheckRegistry to enable testing that metrics are collected. Furthermore it eases unit testing of components that define gauges or health checks (see documentation).
  • Using dropwizard-metrics 4.0.1, only targeting Java 8 and later.
  • Bumped Scala and Akka to latest minor versions.
  • Dropped support for Scala 2.10 and Akka 2.3.
  • Removed deprecations. (Trait FutureMetrics and method Meter.exceptionMarkerPartialFunction.)
  • Akka support moved to a separate library: "nl.grons" %% "metrics4-akka_a24" and "nl.grons" %% "metrics4-akka_a25"
  • Hdr support moved to a separate library: "nl.grons" %% "metrics4-scala-hdr"
  • Upgraded sbt from 0.13 to 1.0. Complete cross build can not be done with a single sbt invocation.

v4.0.0: Jan 2018

v4.0.0 was released but should not be used as it is not compatible with v3.x.

v3.5.9: Jun 2017

  • Further performance improvement for creating dynamically created HDR metrics, thanks to the very attentive @OlegIlyenko (and again @agourlay) (#92)

v3.5.8: Jun 2017

  • Regression from 3.5.7: fixed a race condition in creating dynamically created HDR metrics, thanks go to @agourlay (#91)

v3.5.7: Jun 2017

  • A performance optimization for dynamically created HDR metrics, a fine contribution by @truemped and @otrosien (#90)
  • Version bumps: Metrics-core 3.2.0 → 3.2.2, Scala 2.12.1 → 2.12.2, Scala 2.11.8 → 2.11.11, Akka 2.4.17 → 2.4.18

v3.5.6: Feb 2017

  • Version bumps: Metrics-core 3.1.2 → 3.2.0, Scala 2.12.0 → 2.12.1, Akka 2.3.15 → 2.3.16 and 2.4.14 → 2.4.17.
  • Dropped Akka 2.2 support.

v3.5.5: Sep 2016

  • Measure also when the value-by-name parameter of timeFuture throws (#78) by @Slakah. Thanks JCollier!
  • Introduces DefaultInstrumented, a great convenience introduced by @jklukas (#80). Good idea Jeff!
  • Bumped optional HdrHistogram dependency from 2.1.6 to 2.1.9.
  • (2016-10-06) Released for scala 2.12.0-RC1 and akka 2.4.11 (no longer supported). This release was not possible without the work of @takezoe (#83). Thanks Naoki!
  • (2016-10-26) Released for scala 2.12.0-RC2 and akka 2.4.11 (no longer supported).
  • (2016-11-04) Released for scala 2.12.0 and akka 2.4.12.

v3.5.4: Apr 2016

  • Removed double class from metric name (#75), reported by Per Rovegård (@provegard). Thanks Per!
  • Improved metric names for metrics in nested classes and in anonymous sub-classes.
  • Deprecated class FutureMetrics.
  • Added Timer.timeFuture. This fixes #68 for real, thanks to @maciej for the thought seed.
  • Akka 2.3 bumped to 2.3.15.

v3.5.3: Mar 2016

  • Introduced ActorInstrumentedLifeCycle to automatically unregister gauges in actors (#69). It took quite some time to find a simple solution. Thanks go to @mrmeyers99, @ymeymann and @scullxbones for ideas and example code.
  • Akka 2.3 bumped to 2.3.14, Scala 2.10 bumped to 2.10.6, Scala 2.11 bumped to 2.11.8.

v3.5.2: Sep 2015

  • Added implicits to write MetricFilters as a scala function, idea and code from @maciej (#62).
  • Removed Akka 2.1 support.
  • Akka 2.3 bumped to 2.3.13, Scala 2.11 bumped to 2.11.7.

v3.5.1: May 2015

  • Added method countConcurrency to counters, idea from @fedeoasi, pull request by @gshakhn (#60).
  • For Akka 2.3 build: build against Akka 2.3.11.

v3.5.0: Apr 2015

  • This release is not binary, nor source compatible with 3.4.x. The incompatibility is restricted to health-checks. Previously a code block written as second parameter for method healthCheck would be evaluated at the call-side, using only the last expression in the block as pass-by-name parameter. Now, the entire block is passed as a call-by-value parameter. The latter is more what you would expect, so you probably won't notice any incompatibility.
  • Health-checks now support Unit and Future checkers. Based on a pull request from Scala virtuoso @davidhoyt (#59). (Also, this solves #42 for real.)
  • Build against io.dropwizard.metrics 3.1.2.

v3.4.0: Mar 2015

  • Added support for hdrhistogram.
  • For Akka 2.2 build: build against Akka 2.2.5.
  • For Akka 2.3 build: build against Akka 2.3.9.

v3.3.0: Sep 2014

  • Build against io.dropwizard.metrics 3.1.0.
  • For Akka 2.3 build: build against Akka 2.3.6.

v3.2.1: Aug 2014

  • For future timing, invoke argument only once, closes #50. Bug report and solution from @JeffBellegarde.
  • Added support for cached gauge, a nice pull request by @pasieronen (#52).
  • For Akka 2.3 build: build against Akka 2.3.5.

v3.2.0: May 2014

  • This release is not binary compatible with 3.1.x.
  • Properly support multi-line health-checks, closes #42. An incredibly subtle bug reported by @joster-jambit, with a nifty solution from @som-snytt. (Update: the problem has been fully solved in version 3.5.0.)
  • Added support for Try in Health-checks, an idea of our own @scullxbones.
  • Futures are now supported in the build without Akka (solves #44 by @yatskevich).
  • Allow measurements of Futures that were created elsewhere (#45).

v3.1.1.1: April 2014

  • Only released for Scala 2.11 and Akka 2.3.
  • This release fixed a test dependency which was accidentally declared as regular dependency (#40) thanks for the report @lvicentesanchez.

v3.1.1: April 2014

  • Solved problem with conflicting inherited members in the version 3.1.0 (#37) reported by @dvallejo, thanks!

v3.1.0: April 2014

  • Build against no Akka (closes #32, #33, #21), Akka 2.1.4, 2.2.4 and 2.3.2.
  • Now also build for Scala 2.11 (closes #34).
  • Entire cross-build is now done with a script (#30, #31), based on research from @scullxbones.
  • ".package" in metrics name (closes #19), thanks @akalinovskiy!
  • Allow non-Class-based metric naming, #35, a great idea from @arosien

v3.0.5: March 2014

  • Build against Metrics-core 3.0.2.
  • Build against Akka 2.1.4, 2.2.4 and 2.3.0.
  • Small documentations correction (thanks @oschrenk!)
  • Fixed description in pom.

v3.0.4: December 2013

  • Same release build against Akka 2.2.0 instead of [2.2,).

v3.0.3_a2.1.0: September 2013

  • Same release build against Akka 2.1.0 instead of 2.2.0.

v3.0.3: August 2013

  • Added support for health checks (thanks @scullxbones), #17. The module metrics-healthchecks is now a required dependency.

v3.0.2: August 2013

  • added back inc/dec on Counter (thanks @alexy), #14
  • Renamed Timer.time for partial functions to prevent type annotations (thanks @scullxbones), #13, #15.
  • Renamed Meter.exceptionMarkerPartialFunction to Meter.exceptionMarkerPF to be consistent with Timer.

v3.0.1: August 2013

  • Upgrade to Metrics-core 3.0.1, #10.
  • Added support for partial functions (thanks @scullxbones).
  • Added support for actors and futures (scala 2.10 only) for timing and metering exceptions (thanks @scullxbones), #8.
  • Removes '$' from metrics names, #11.

v3.0.0: June 2013

  • As code is no longer maintained by Coda Hale, added and updated copyright statements to reflect this.
  • Depends on Metrics-core 3.0.0.
  • Ported tests from original to ScalaTest (thanks @scullxbones).
  • Added documentation.

Although the metrics-scala API is mostly source compatible, there are breaking API changes which are mostly caused by changes in the metrics-core library:

  • All code moved to the nl.grons.metrics.scala package (changed at Coda Hale's request).
  • All timers now measure in nanoseconds.
  • All configuration for histograms, meters, and timers are gone. These are now configured in the reporter.
  • The class Instrumented must now be created in your project by extending InstrumentedBuilder.
  • Dropped method clear on Histogram and Timer.

Up to v2.2.0

  • No code changes.

v2.1.2: Sep 10 2012

  • Initial copy from Coda Hale's Metrics project.