The great deprecations spring cleaning

[crusaderky]

This repository has accumulated several years worth of deprecated functionality, which nobody ever cleaned up.

I wrote a bunch of independent PRs which:

• remove all functionality which has raised DeprecationWarning or FutureWarning at least since 2024
• add a handful new warnings for deprecated/dead functionality which however was not raising any warning until now.

All PRs merged together into a single branch are available at crusaderky:staged-deprecations.

@dask/maintenance @ntabris could I get eyes on these before I merge? A retest of downstream libraries would be advisable.

Notes

• I could not clean up distributed.deploy.old_ssh, because it is currently used by the dask ssh CLI. rerouting the CLI to use distributed.deploy.ssh is non-trivial.
• I chose not to clean up the deprecated config keys in distributed.config. Some of them are 4 years old; however warnings have been issued only for the last 2 years (Warn for deprecations on dask.config.set() #8179). I'm wary of breaking environments which have a long-forgotten dask.yaml config file deployed, so I'd rather leave them there for another couple of years.

The list

• Clean up deprecations in SchedulerPlugin.remove_worker #9222
• Clean up deprecations in register_plugin #9225
• Clean up deprecations in utils_test #9226
• Clean up deprecated loop properties and parameters #9231
• Clean up deprecations in distributed.compatibility #9232
• Clean up deprecated client context in different tasks/threads #9233
• Clean up deprecated async listener.stop() #9234
• Clean up deprecated rpc synchronous context manager #9235
• Clean up deprecations in distributed.utils #9236
• Clean up deprecated Lock client parameter #9237
• Clean up deprecations in Scheduler, Worker, Nanny #9238
• Clean up deprecations in security #9239
• Clean up deprecations in CLI #9240
• Clean up deprecated stream RPC handler argument #9242
• Clean up deprecated nested_deserialize #9243
• Clean up deprecations in distributed.deploy #9244
• Clean up deprecated Prometheus metrics #9249
• Clean up deprecations in ProgressBar #9250

[martindurant]

I can't promise time on this, but kudos to you for putting in the effort to make things better for everyone.