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These are the flags/commands under buck2 killall and their --help output:

buck killall

Kill all buck2 processes on the machine

Usage: buck2-release killall [OPTIONS]

-h, --help
Print help (see a summary with '-h')

Event Log Options:
--event-log <PATH>
Write events to this log file

--write-build-id <PATH>
Write command invocation id into this file

--unstable-write-invocation-record <PATH>
Write the invocation record (as JSON) to this path. No guarantees whatsoever are made
regarding the stability of the format

Universal Options:
-v, --verbose <VERBOSITY>
How verbose buck should be while logging.

Values: 0 = Quiet, errors only; 1 = Show status. Default; 2 = more info about errors; 3 =
more info about everything; 4 = more info about everything + stderr;

It can be combined with specific log items (stderr, full_failed_command, commands,
actions, status, stats, success) to fine-tune the verbosity of the log. Example usage

[default: 1]

--oncall <ONCALL>
The oncall executing this command

--client-metadata <CLIENT_METADATA>
Metadata key-value pairs to inject into Buck2's logging. Client metadata must be of the
form `key=value`, where `key` is a snake_case identifier, and will be sent to backend