Cecile Tongletsc-telemetry
Substrate's client telemetry is a part of substrate that allows logging telemetry information with a Polkadot telemetry.
It works using Tokio's tracing. The telemetry
information uses tracing's logging to report the telemetry which is then retrieved by a
tracing's Layer. This layer will then send the data through an asynchronous channel and to a
background task called [TelemetryWorker] which will send the information to the telemetry
server.
If multiple substrate nodes are running, it uses a tracing's Span to identify which substrate
node is reporting the telemetry. Every task spawned using sc-service's TaskManager
automatically inherit this span.
Substrate's nodes initialize/register to the [TelemetryWorker] using a [TelemetryHandle].
This handle can be cloned and passed around. It uses an asynchronous channel to communicate with
the running [TelemetryWorker] dedicated to registration. Registering a telemetry can happen at
any point in time during the execution.
License: GPL-3.0-or-later WITH Classpath-exception-2.0