ALUMET v0.4.0

Core changes

• It is now possible to add new measurement sources at runtime, after the pipeline has been built.
• Event handlers now return a Result to handle errors more gracefully.
• The pipeline now waits for the sources, transforms and outputs to finish before stopping. This allows all the plugins to flush their buffers, avoiding data loss.
• Errors that occur in pipeline elements are handled more effectively.
• Improved ergonomics and robustness of the pipeline builder.
• MeasurementBuffer now implements IntoIterator.
• Other improvements to the plugin API, including more documentation ✍️

The aforementioned improvements have enabled the creation of two new plugins and one agent feature! (see below) 🎉

Plugin changes

• New: perf plugin (#2) for perf_events monitoring and profiling (hardware, software and cache events are supported)
• New: influx plugin to send measurements to InfluxDB v2
• More options for the csv plugin
• More options for the nvidia plugin
• Bug fixes for the rapl plugin: it is now more robust to unexpected situations (such as kernel modules not being loaded)

Agent changes

• The app-agent crate (that produces alumet-agent) has a new "exec mode" that spawns and observes a single process.
• Both the "normal" alumet agent and the relay agent now suggest to regenerate the configuration file if it is invalid.
• Other improvements to the textual output of the agents.

Full Changelog: v0.3.0...v0.4.0