completion

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

buck completion

Print completion configuration for shell

For a one-time setup, run one of the following commands:
    source <(buck2 completion bash)
    source <(buck2 completion zsh)

Usage: buck2-release completion [OPTIONS] <SHELL>

Arguments:
  <SHELL>
          shell for which to generate completion script
          
          [possible values: bash, zsh]

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

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
          "-v=1,stderr"
          
          [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
          datasets