mtail is a tool for extracting metrics from application logs to be exported into a timeseries database or timeseries calculator for alerting and dashboarding.

It fills a monitoring niche by being the glue between applications that do not export their own internal state (other than via logs) and existing monitoring systems, such that system operators do not need to patch those applications to instrument them or writing custom extraction code for every such application.

The extraction is controlled by mtail programs which define patterns and actions:

# simple line counter
counter lines_total
/$/ {
  lines_total++
}

Metrics are exported for scraping by a collector as JSON or Prometheus format over HTTP, or can be periodically sent to a collectd, StatsD, or Graphite collector socket.

Read the programming guide if you want to learn how to write mtail programs.

Ask general questions on the users mailing list: https://groups.google.com/g/mtail-users

There are various ways of installing mtail.

Precompiled binaries for released versions are available in the Releases page on Github. Using the latest production release binary is the recommended way of installing mtail.

Windows, OSX and Linux binaries are available.

The simplest way to get mtail is to go get it directly.

go get github.com/google/mtail/cmd/mtail

This assumes you have a working Go environment with a recent Go version. Usually mtail is tested to work with the last two minor versions (e.g. Go 1.12 and Go 1.11).

If you want to fetch everything, you need to turn on Go Modules to succeed because of the way Go Modules have changed the way go get treats source trees with no Go code at the top level.

GO111MODULE=on go get -u github.com/google/mtail
cd $GOPATH/src/github.com/google/mtail
make install

If you develop the compiler you will need some additional tools like goyacc to be able to rebuild the parser.

See the Build instructions for more details.

A Dockerfile is included in this repository for local development as an alternative to installing Go in your environment, and takes care of all the build dependency installation, if you don't care for that.

mtail works best when paired with a timeseries-based calculator and alerting tool, like Prometheus.

So what you do is you take the metrics from the log files and you bring them down to the monitoring system?

It deals with the instrumentation so the engineers don't have to! It has the extraction skills! It is good at dealing with log files!!

Full documentation at http://google.github.io/mtail/

Read more about writing mtail programs:

• Programming Guide
• Language Reference
• Metrics
• Managing internal state
• Testing your programs

Read more about hacking on mtail

• Building from source
• Contributing
• Style

Read more about deploying mtail and your programs in a monitoring environment

• Deploying
• Interoperability with other systems
• Troubleshooting
• FAQ

If you have any questions, please use the GitHub Discussions Q&A.

We also have an email list : https://groups.google.com/forum/#!forum/mtail-users

For any defects please file a new issue.