Hi folks! 
We have just released Telemetry 0.4.0. With this version, Telemetry events now carry a map of measurements instead of a single measurement. This is useful in cases when there are multiple values describing what just happened, e.g. in case of HTTP request the event might include decompression time, payload size, and processing time:
:telemetry.execute(
[:http, :request],
%{payload_size: 12874, processing_time: 120, decompression_time: 5},
%{status: 200, path: "/..."}
)
Previously, each measurement needed to be emitted in a dedicated event. Now the event tells that a thing happened, and measurements and metadata describe its properties.
This change is backwards-compatible for event publishers, i.e. you can still call :telemetry.execute/3 with a single value. However, event handlers need to handle a map of measurements now.
Last but not least, thanks for the awesome feedback from the community which lead to this release!
