metrics: clarify that num_alive_tasks is not strongly consistent#7614
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ADD-SP merged 1 commit intotokio-rs:masterfrom Dec 29, 2025
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metrics: clarify that num_alive_tasks is not strongly consistent#7614ADD-SP merged 1 commit intotokio-rs:masterfrom
num_alive_tasks is not strongly consistent#7614ADD-SP merged 1 commit intotokio-rs:masterfrom
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| /// Note: When using the multi-threaded runtime this number may not | ||
| /// not have strong consistency i.e. no tasks may be running but the metric | ||
| /// reports otherwise. | ||
| /// |
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I would say RuntimeMetrics is not designed to be accurate, I think it would better move this "Note" to the struct level.
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num_alive_tasks is not strongly consistent
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Thanks! I don't want to block this PR too long for nits.
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Bumps tokio from 1.48.0 to 1.49.0.
Release notes
Sourced from tokio's releases.
Tokio v1.49.0
1.49.0 (January 3rd, 2026)
Added
net: add support for TCLASS option on IPv6 (#7781)
runtime: stabilize runtime::id::Id (#7125)
task: implement Extend for JoinSet (#7195)
task: stabilize the LocalSet::id() (#7776)
Changed
net: deprecate {TcpStream,TcpSocket}::set_linger (#7752)
Fixed
macros: fix the hygiene issue of join! and try_join! (#7766)
runtime: revert "replace manual vtable definitions with Wake" (#7699)
sync: return TryRecvError::Disconnected from Receiver::try_recv after Receiver::close (#7686)
task: remove unnecessary trait bounds on the Debug implementation (#7720)
Unstable
fs: handle EINTR in fs::write for io-uring (#7786)
fs: support io-uring with tokio::fs::read (#7696)
runtime: disable io-uring on EPERM (#7724)
time: add alternative timer for better multicore scalability (#7467)
Documented
docs: fix a typos in bounded.rs and park.rs (#7817)
io: add SyncIoBridge cross-references to copy and copy_buf (#7798)
io: doc that AsyncWrite does not inherit from std::io::Write (#7705)
metrics: clarify that num_alive_tasks is not strongly consistent (#7614)
net: clarify the cancellation safety of the TcpStream::peek (#7305)
net: clarify the drop behavior of unix::OwnedWriteHalf (#7742)
net: clarify the platform-dependent backlog in TcpSocket docs (#7738)
runtime: mention LocalRuntime in new_current_thread docs (#7820)
sync: add missing period to mpsc::Sender::try_send docs (#7721)
sync: clarify the cancellation safety of oneshot::Receiver (#7780)
sync: improve the docs for the errors of mpsc (#7722)
task: add example for spawn_local usage on local runtime (#7689)
#7125: tokio-rs/tokio#7125
#7195: tokio-rs/tokio#7195
#7305: tokio-rs/tokio#7305
#7467: tokio-rs/tokio#7467
#7614: tokio-rs/tokio#7614
#7686: tokio-rs/tokio#7686
#7689: tokio-rs/tokio#7689
... (truncated)
Commits
e3b89bb chore: prepare Tokio v1.49.0 (#7824)
4f577b8 Merge 'tokio-1.47.3' into 'master'
f320197 chore: prepare Tokio v1.47.3 (#7823)
ea6b144 ci: freeze rustc on nightly-2025-01-25 in netlify.toml (#7652)
264e703 Merge tokio-1.43.4 into tokio-1.47.x (#7822)
dfb0f00 chore: prepare Tokio v1.43.4 (#7821)
4a91f19 ci: fix wasm32-wasip1 tests (#7788)
601c383 ci: upgrade FreeBSD from 14.2 to 14.3 (#7758)
484cb52 sync: return TryRecvError::Disconnected from Receiver::try_recv after `Re...
16f20c3 rt: mention LocalRuntime in new_current_thread docs (#7820)
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Motivation
I was confused by this to I opened #7591
Solution
Update the documentation so future people know not to trust this metric when using the multithreaded runtime.