ydb/yt/cpp/mapreduce/interface/logging, branch main

YT-28451: Add tagged logging API and opaque event payload

2026-07-17T09:07:46Z

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% || |# -- #| || **![](https://nda.ya.ru/t/mAiQIjHx7Mm3JC =30x) Echo tests** || |# commit_hash:70efc90e5c2b71e5311415a4e4508db42ff28971

YT-24500: Introduce structured logging

2025-05-02T23:02:40Z

commit_hash:e6ea4db1e3a66694223008fec3b5064a4d58a8e1

Fix -Wunused-parameter in y*

2024-12-17T09:35:32Z

TRIVIAL commit_hash:f55dc23fb741393c444b088024393fa452d06795

YT-23645: mapreduce client can use yt/core log manager

2024-11-28T12:45:53Z

commit_hash:7007a3c7f56a6f271073811160f00f03162aaaa6

Fix regression: static anchors are not updated properly

2024-10-30T12:52:26Z

commit_hash:ab0bd9b2d0569820e495c714baecb05145ed35bf

Introduce message_level_overrides to tune log message levels at runtime

2024-10-20T14:19:01Z

* Changelog entry Type: feature Add message_level_overrides option to logging config for better run-time tuning. commit_hash:07e9563fd111c437edf7ac0e5dd190781878d8fa

[yt/cpp/mapreduce] YT-21595: Use gtest instead of ytest in all mapreduce tests

2024-07-02T20:21:03Z

85671f0cf4f45b4f015fa2cc0d195b81c16c6e8a

feat contrib: aiogram 3

2024-01-19T10:10:03Z

Relates: https://st.yandex-team.ru/, https://st.yandex-team.ru/

External build system generator release 65

2023-12-05T09:25:06Z

Update tools: yexport, os-yexport

add darwin-arm64 CMakeLists

2023-11-20T11:34:20Z