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Replace `TLogEvent::MessageRef` with an opaque `Payload` that carries the message
together with structured key/value tags, deferring tag rendering to the consumer
(logging thread).
- Add the `TTaggedPayloadWriter`/`TTaggedPayloadReader` codec (`NDetail`), with a
per-thread chunk-cached builder so tagged logging does no per-message heap
allocation.
- Model the payload as a typed `TLogEventPayload` — a `std::variant` of the opaque
strong typedefs `TTaggedLogEventPayload` and `TStructuredLogEventPayload` (each
over `TSharedRef`). The active alternative identifies the event kind, so the
separate `ELogMessageKind` enum and `TLogEvent::MessageKind` field are removed;
consumers dispatch via `std::holds_alternative`/`std::get` instead of a tag.
- Add the fluent `YT_TLOG_*` API: `YT_TLOG_INFO("Message").With(key, value)` and
`.With(key, value, "%spec")`; disabled levels skip argument evaluation.
- Add well-known tags: `.With(value)` attaches a value under a statically known
key resolved by ADL (e.g. `.With(error)` for the `Error` tag).
- Teach the plain-text and structured formatters to render tags; add the
`enable_native_tags` knob to emit tags into a nested structured attribute.
- Add producer-side benchmarks. The tagged API is cheaper than `YT_LOG_*` for
tagged calls and on par for tag-free ones:
#|
|| **Producer call** | **`YT_LOG_*`** | **`YT_TLOG_*`** | **Δ** ||
|| no tags | 81 ns | 82 ns | +2% ||
|| 1 tag | 124 ns | 88 ns | -29% ||
|| 2 tags | 140 ns | 101 ns | -28% ||
|| 3 tags | 372 ns | 283 ns | -24% ||
|#
--
#| || **<a href="https://nda.ya.ru/t/p0sVNSOC7ijzFF" target="_blank"> Echo tests</a>** || |#
commit_hash:70efc90e5c2b71e5311415a4e4508db42ff28971
|
