Metrics-Scala
Capturing JVM- and application-level metrics. So you know what's going on.
This is the Scala API for Dropwizard's Metrics library.
Initially this project started out as a line for line copy of the Metrics-scala module, released for multiple scala versions. Metrics dropped the scala module in version 3.0.0 and this project continued separately with the help of @scullxbones.
We strive for long term stability, correctness, an easy to use API and full documentation (in that order).
Contents
- Usage
- Manual
- Manual (version 2.x)
- Features
- Available versions
- Download
- Support
- License
- Travis:
Usage
Metrics-scala provides an easy way to create metrics and health checks in Scala. Since version 3.5.5 creating
metrics and health checks is as easy as extending
DefaultInstrumented and using the metrics
and
healthCheck
builders:
class Example(db: Database) extends nl.grons.metrics.scala.DefaultInstrumented {
// Define a health check
healthCheck("alive") { workerThreadIsActive() }
// Define a timer metric
private[this] val loading = metrics.timer("loading")
// Use timer metric
def loadStuff(): Seq[Row] = loading.time {
db.fetchRows()
}
}
For more detailed information see the manual. For more information on Metrics-core 3.x, please see the documentation.
See also the change log for improvements and API changes.
Features
- Easy creation of all metrics types.
- Easy creation of Health Checks.
- Almost invisible syntax for using timers (see example above).
- Scala specific methods on metrics (e.g.
+=
on counters). - Derives proper metrics names for Scala objects and closures.
- Actor support.
- Future support.
- Hdrhistogram support.
Available versions (abbreviated)
This table shows the most relevant versions of metrics-scala. For the full list see all available versions.
Metrics- scala version |
Metrics- core version |
Akka version |
Scala version | Hdr version (*) |
||
2.10 | 2.11 | 2.12 | ||||
2.1.5 | 2.1.5 | ✓ | ✓ | ✓ | ||
3.5.8 | 3.2.2 | ✓ | ✓ | ✓ | 1.1.0/2.1.9 | |
3.5.8_a2.3 | 3.2.2 | 2.3.16 / 2.4.x / 2.5.x | ✓ | ✓ | 1.1.0/2.1.9 | |
3.5.8_a2.4 | 3.2.2 | 2.4.18 / 2.5.x | ✓ | 1.1.0/2.1.9 |
If you need another version mix please open an issue, or sent an email to the metrics mailing list.
Akka 2.4 is binary compatible with Akka 2.3, and Akka 2.5 is binary compatible with Akka 2.4. Therefore you can freely use a metrics-scala build that was compiled against an older Akka version.
(*) Hdr is an optional dependency. The first number is the version of
"org.mpierce.metrics.reservoir" % "hdrhistogram-metrics-reservoir"
, the second the version of
"org.hdrhistogram" % "HdrHistogram"
. See also hdrhistogram manual page.
Download
SBT:
libraryDependencies += "nl.grons" %% "metrics-scala" % "3.5.8_a2.4"
Maven:
<properties>
<scala.version>2.12.1</scala.version>
<scala.compat.version>2.12</scala.compat.version>
</properties>
<dependency>
<groupId>nl.grons</groupId>
<artifactId>metrics-scala_${scala.compat.version}</artifactId>
<version>3.5.8_a2.4</version>
</dependency>
To use hdrhistogram additional dependencies are needed. See the hdrhistogram manual page.
Support
If you find a bug, please open an issue, better yet: send a pull request. For questions, please sent an email to the metrics mailing list.
License
Copyright (c) 2010-2012 Coda Hale, Yammer.com (before 3.0.0)
Copyright (c) 2013-2017 Erik van Oosten (3.0.0 and later)
Published under Apache Software License 2.0, see LICENSE