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## Problem We want to switch proxy and ideally all Rust services to structured JSON logging to support better filtering and cross-referencing with tracing. ## Summary of changes * Introduce a custom tracing-subscriber to write the JSON. In a first attempt a customized tracing::fmt::FmtSubscriber was used, but it's very inefficient and can still generate invalid JSON. It's also doesn't allow us to add important fields to the root object. * Make this opt in: the `LOGFMT` env var can be set to `"json"` to enable to new logger at startup.