Add slogAdapter

[SungJin1212]

This PR adds a slogAdapter converting go-kit/log to slog.

It would be good to use slogAdapter to upgrade the Prometheus version. We could implement features included in Prometheus v3.0.0, like OTLP metadata, OOO ingestion native histogram, UTF-8 support, and so on.

After that, we could migrate whole logs to slog if needed.

Which issue(s) this PR fixes:
Fixes #6402

Checklist

• Tests updated
• Documentation added
• CHANGELOG.md updated - the order of entries should be [CHANGE], [FEATURE], [ENHANCEMENT], [BUGFIX]

[yeya24]

This doesn't seem relevant.

==================
WARNING: DATA RACE
Write at 0x0000037316f7 by goroutine 39:
  github.com/cortexproject/cortex/pkg/querier/tripperware.NewQueryTripperware()
      /__w/cortex/cortex/pkg/querier/tripperware/roundtrip.go:112 +0x7a
  github.com/cortexproject/cortex/pkg/querier/tripperware/queryrange.TestRoundTrip()
      /__w/cortex/cortex/pkg/querier/tripperware/queryrange/query_range_middlewares_test.go:71 +0x42b
  testing.tRunner()
      /usr/local/go/src/testing/testing.go:1690 +0x226
  testing.(*T).Run.gowrap1()
      /usr/local/go/src/testing/testing.go:1743 +0x44

Previous read at 0x0000037316f7 by goroutine 72:
  github.com/prometheus/prometheus/promql/parser.(*parser).newAggregateExpr()
      /__w/cortex/cortex/vendor/github.com/prometheus/prometheus/promql/parser/parse.go:450 +0x1aa
  github.com/prometheus/prometheus/promql/parser.(*yyParserImpl).Parse()
      /__w/cortex/cortex/vendor/github.com/prometheus/prometheus/promql/parser/generated_parser.y.go:1072 +0x1568
  github.com/prometheus/prometheus/promql/parser.(*parser).parseGenerated()
      /__w/cortex/cortex/vendor/github.com/prometheus/prometheus/promql/parser/parse.go:895 +0xc4
  github.com/prometheus/prometheus/promql/parser.(*parser).ParseExpr()
      /__w/cortex/cortex/vendor/github.com/prometheus/prometheus/promql/parser/parse.go:100 +0xcf
  github.com/prometheus/prometheus/promql/parser.ParseExpr()
      /__w/cortex/cortex/vendor/github.com/prometheus/prometheus/promql/parser/parse.go:171 +0xda
  github.com/cortexproject/cortex/pkg/querier/tripperware/queryrange.Test_evaluateAtModifier.func1()
      /__w/cortex/cortex/pkg/querier/tripperware/queryrange/split_by_interval_test.go:398 +0x1f9
  testing.tRunner()
      /usr/local/go/src/testing/testing.go:1690 +0x226
  testing.(*T).Run.gowrap1()
      /usr/local/go/src/testing/testing.go:1743 +0x44

Goroutine 39 (running) created at:
  testing.(*T).Run()
      /usr/local/go/src/testing/testing.go:1743 +0x825
  testing.runTests.func1()
      /usr/local/go/src/testing/testing.go:2168 +0x85
  testing.tRunner()
      /usr/local/go/src/testing/testing.go:1690 +0x226
  testing.runTests()
      /usr/local/go/src/testing/testing.go:2166 +0x8be
  testing.(*M).Run()
      /usr/local/go/src/testing/testing.go:2034 +0xf17
  main.main()
      _testmain.go:103 +0x164

Goroutine 72 (finished) created at:
  testing.(*T).Run()
      /usr/local/go/src/testing/testing.go:1743 +0x825
  github.com/cortexproject/cortex/pkg/querier/tripperware/queryrange.Test_evaluateAtModifier()
      /__w/cortex/cortex/pkg/querier/tripperware/queryrange/split_by_interval_test.go:388 +0x233
  testing.tRunner()
      /usr/local/go/src/testing/testing.go:1690 +0x226
  testing.(*T).Run.gowrap1()
      /usr/local/go/src/testing/testing.go:1743 +0x44
==================
--- FAIL: TestSplitQuery (0.00s)
    --- FAIL: TestSplitQuery/1 (0.01s)
        testing.go:[139](https://github.com/cortexproject/cortex/actions/runs/12193243541/job/34015175708?pr=6405#step:6:140)9: race detected during execution of test
--- FAIL: TestConstSplitter_generateCacheKey (0.00s)
    testing.go:1399: race detected during execution of test
--- FAIL: TestRoundTrip (0.06s)
    testing.go:1399: race detected during execution of test
--- FAIL: TestMergeAPIResponses (0.00s)
    testing.go:1399: race detected during execution of test
--- FAIL: TestResponseWithStats (0.00s)
    testing.go:1399: race detected during execution of test
--- FAIL: TestShouldCache (0.00s)
    --- FAIL: TestShouldCache/negative_offset_on_subqueries (0.00s)
        testing.go:1399: race detected during execution of test
--- FAIL: TestResponse (0.00s)
    testing.go:1399: race detected during execution of test
--- FAIL: TestRequest (0.00s)
    testing.go:1399: race detected during execution of test
--- FAIL: TestSplitByDay (0.03s)
    testing.go:1399: race detected during execution of test
--- FAIL: TestHandleHit (0.02s)
    testing.go:1399: race detected during execution of test
--- FAIL: TestNextIntervalBoundary (0.03s)
    testing.go:1399: race detected during execution of test
--- FAIL: TestLimitsMiddleware_MaxQueryLookback (0.00s)
    testing.go:1399: race detected during execution of test
--- FAIL: TestCompressedResponse (0.00s)
    testing.go:1399: race detected during execution of test
--- FAIL: TestResultsCacheMaxFreshness (0.00s)
    --- FAIL: TestResultsCacheMaxFreshness/0 (0.25s)
        testing.go:1399: race detected during execution of test
FAIL
FAIL	github.com/cortexproject/cortex/pkg/querier/tripperware/queryrange	0.442s

[SungJin1212]

@yeya24
It seems relevant to #6355.
It seems caused by concurrent access to EnableExperimentalFunctions.

[yeya24]

I wonder if we should name this function to PrometheusLoggerToSlot and have another function for GoKitLogToSlog which takes an additional level parameter?

[yeya24]

Thanks!