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https://issues.apache.org/jira/browse/MNG-6899?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Guillaume Nodet updated MNG-6899:
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Fix Version/s: (was: 4.0.x-candidate)
> Maven Runtime Metrics System
> ----------------------------
>
> Key: MNG-6899
> URL: https://issues.apache.org/jira/browse/MNG-6899
> Project: Maven
> Issue Type: New Feature
> Components: Performance
> Affects Versions: 3.6.3
> Reporter: Enrico Olivelli
> Assignee: Enrico Olivelli
> Priority: Major
> Fix For: 4.x / Backlog
>
>
> The idea is to have a mechanism to track runtime metrics for Maven Core
> itself and for plugins.
> We introduce a new Metrics API that defines Counters, Summaries and other
> types of metrics.
> The default implementation of the Metrics API will be a no-operation dummy
> implementation, that does not add significant overhead at runtime.
> We will provide as separate modules an implementation that gathers all of the
> metric and output them to console or to a file, that can be easily parsed by
> tools, like Jenkins.
> I will also contribute an implementation for Prometheus.io, this way we can
> track how the system behaves at runtime, Prometheus.io and other metrics
> systems store time series data and this is very useful to track down to
> hotspots during Maven execution.
> For the first implementation we will introduce some base instrumentation of
> Maven Core, in order to have some useful metric.
> The Metrics System will be loaded from "Extensions" and we will use usual
> @Inject mechanism. Maven Core will bundle the noop implementation but it
> will be overridden by other implementations found on the main classloader of
> Maven, as we do for other compoments.
> Useful metrics to implement initially:
> - Maven mojo execution times
> - Maven model build time
> - Download of artifacts from remote repositories (needs Wagon intrumentation)
> - Reads/Writes from/to local repository
> This is the Proof-of-concept implementation on Maven Studies
> https://github.com/apache/maven-studies/tree/maven-metrics
> This is a simple implementation
> https://github.com/eolivelli/simplemavenmetrics
> Concrete steps for the implementation:
> - create a new Maven Module "maven-metrics" that contains the API and the
> "simple" implementation
> - include ONLY the maven-metrics-api module in Maven Core
> - Add basic intrumentation to Maven Core
> - Add basic intrumentation to Wagon and to Resolver
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