Commits on Dec 2, 2022

1. encoding/: Adopt serde style encoding …

   Adopt encoding style similar to serde. `EncodeXXX` for a type that can be
   encoded (see serde's `Serialize`) and `XXXEncoder` for a supported encoding i.e.
   text and protobuf (see serde's `Serializer`).
   
   - Compatible with Rust's additive features. Enabling the `protobuf` feature does
   not change type signatures.
   - `EncodeMetric` is trait object safe, and thus `Registry` can use dynamic dispatch.
   - Implement a single encoding trait `EncodeMetric` per metric type instead of
   one implementation per metric AND per encoding format.
   - Leverage `std::fmt::Write` instead of `std::io::Write`. The OpenMetrics text
   format has to be unicode compliant. The OpenMetrics Protobuf format requires
   labels to be valid strings.
   
   Signed-off-by: Max Inden <mail@max-inden.de>

   

   mxinden committed Dec 2, 2022
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