[cachekit-release-bot]

🤖 I have created a release beep boop

0.26.0 (2026-11-01)

Features

• decorators: let async @cache opt out of the miss-path distributed lock (LAB-7166) (#667) (1e2295d)

Bug Fixes

• metrics: skip thread-state retirement once the interpreter is exiting (LAB-12087) (#679) (42d7aea)
• monitoring: make enable_prometheus_metrics=False stop recording (LAB-12038) (#681) (3d81a93)
• perf: name the cachekit, Python and CPU a terrain recording ran (LAB-11993) (#687) (251a2fa)
• perf: terrain canary records the L2 label without its padding (LAB-11993) (#676) (4b2c65c)

Performance Improvements

• decorators: a backed L1 hit skips the stats context and log kwargs (LAB-12115) (#686) (9c1bd7f)
• decorators: answer the L1-only hit in one lock-free call into the extension (LAB-12024) (#673) (8b17e51)
• l1: skip the structure walk and object hook on a kept L1 entry (LAB-12023) (#671) (7fbdfbe)
• l1: sweep expired entries from a deadline heap in short lock holds (LAB-12117) (#683) (63cf745)
• memcached: pick the server natively, as pymemcache's rendezvous hash does (LAB-12116) (#680) (a79cc90)
• redis: an uncontended async miss waits on 3 round trips, not 5 (LAB-12118) (#682) (1ef1d05)
• serializers: decode StandardSerializer reads in Rust, bounds and decode in one pass (LAB-12030) (#674) (39b1bdf)
• write-behind: park an idle writer thread instead of starting one per miss (LAB-12005) (#692) (96141b7)

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ All tests successful. No failed tests found.

📢 Thoughts on this report? Let us know!

[github-actions]

Instruction budget: PASS

Head 583478175bea3853d285913ba2d79983da3572d5 measured against base v0.25.1 (312836d), last release on the same runner, on cpython-3.12-x86_64 (3.12.3). Workflow run

Verdict	Path	Head Ir/op	Base Ir/op	Delta
new	l1_hit_backed	–	–	–
LOWER	l1_hit	2,881	13,129	-78.06%
LOWER	l2_hit	184,688	196,045	-5.79%
LOWER	l2_hit_async_metrics	184,786	195,684	-5.57%
LOWER	minimal_l1_hit	2,888	11,986	-75.91%
LOWER	secure_l1_hit	138,056	156,279	-11.66%
LOWER	serializer_default	52,783	64,588	-18.28%
LOWER	serializer_default_records	1,041,835	1,481,271	-29.67%
LOWER	serializer_encrypted	97,535	109,644	-11.04%
ok	byte_storage_store_40b	2,756	2,757	-0.04%
ok	byte_storage_store_64k	724,782	724,750	+0.00%
ok	file_set	86,704	86,941	-0.27%
ok	miss	242,488	242,055	+0.18%
ok	object_cache_put_full	198,753	198,508	+0.12%
ok	serializer_arrow	2,214,099	2,220,527	-0.29%
ok	serializer_auto	72,504	72,849	-0.47%
ok	serializer_orjson	24,838	24,877	-0.16%

A path fails at +1% or more against the base (+2% for serializer_orjson). This check is not required: a deliberate cost increase is accepted at merge. Method: docs/performance.md, Instruction budgets.