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Add a readme about feature metered for sp-utils (#8736)

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Roman Proskuryakov
2021-05-05 15:33:52 +00:00
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commit 7c3a3f79ba
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substrate/primitives/utils/README.md
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Utilities Primitives for Substrate
License: Apache-2.0
## Features
### metered
This feature changes the behaviour of the function `mpsc::tracing_unbounded`.
With the disabled feature this function is an alias to `futures::channel::mpsc::unbounded`.
However, when the feature is enabled it creates wrapper types to `UnboundedSender<T>`
and `UnboundedReceiver<T>` to register every `send`/`received`/`dropped` action happened on
the channel.
Also this feature creates and registers a prometheus vector with name `unbounded_channel_len` and labels:
| Label | Description |
| ------------ | --------------------------------------------- |
| entity | Name of channel passed to `tracing_unbounded` |
| action | One of `send`/`received`/`dropped` |
License: Apache-2.0