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5b9503ed33
It's quite frustrating, particularly on the command line, not to have access to the list of available levels and verbosities when one does not exist for a given source, because there's no easy way to find them except by starting without and connecting to the CLI. Let's enumerate the list of supported levels and verbosities when a name does not match. For example: $ ./haproxy -db -f quic-repro.cfg -dt h2:help [NOTICE] (9602) : haproxy version is 3.0-dev12-60496e-27 [NOTICE] (9602) : path to executable is ./haproxy [ALERT] (9602) : -dt: no such trace level 'help', available levels are 'error', 'user', 'proto', 'state', 'data', and 'developer'. $ ./haproxy -db -f quic-repro.cfg -dt h2:user:help [NOTICE] (9604) : haproxy version is 3.0-dev12-60496e-27 [NOTICE] (9604) : path to executable is ./haproxy [ALERT] (9604) : -dt: no such trace verbosity 'help' for source 'h2', available verbosities for this source are: 'quiet', 'clean', 'minimal', 'simple', 'advanced', and 'complete'. The same is done for the CLI where the existing help message is always displayed when entering an invalid verbosity or level.