$ streamlink -l trace
[20:43:49.001245][MainThread][cli][debug] OS:         Linux-6.14.10-1-git-x86_64-with-glibc2.41
[20:43:49.001380][MainThread][cli][debug] Python:     3.13.3
[20:43:49.001438][MainThread][cli][debug] OpenSSL:    OpenSSL 3.5.0 8 Apr 2025
[20:43:49.001482][MainThread][cli][debug] Streamlink: 7.4.0+6.g4dd62f2d
[20:43:49.001523][MainThread][cli][debug] Dependencies:
[20:43:49.002676][MainThread][cli][debug]  certifi: 2025.4.26
[20:43:49.003257][MainThread][cli][debug]  isodate: 0.7.2
[20:43:49.003561][MainThread][cli][debug]  lxml: 5.4.0
[20:43:49.003972][MainThread][cli][debug]  pycountry: 24.6.1
[20:43:49.004225][MainThread][cli][debug]  pycryptodome: 3.23.0
[20:43:49.004557][MainThread][cli][debug]  PySocks: 1.7.1
[20:43:49.004842][MainThread][cli][debug]  requests: 2.32.3
[20:43:49.005152][MainThread][cli][debug]  trio: 0.30.0
[20:43:49.005416][MainThread][cli][debug]  trio-websocket: 0.12.2
[20:43:49.005713][MainThread][cli][debug]  urllib3: 2.4.0
[20:43:49.006011][MainThread][cli][debug]  websocket-client: 1.8.0
[20:43:49.006125][MainThread][cli][debug] Arguments:
[20:43:49.006180][MainThread][cli][debug]  --loglevel=trace
[20:43:49.006234][MainThread][cli][debug]  --player=/usr/bin/mpv
[20:43:49.006303][MainThread][cli][debug]  --webbrowser-headless=True
usage: streamlink [OPTIONS] <URL> [STREAM]

Use -h/--help to see the available options or read the manual at https://streamlink.github.io/

$ streamlink -l debug
[cli][debug] OS:         Linux-6.14.10-1-git-x86_64-with-glibc2.41
[cli][debug] Python:     3.13.3
[cli][debug] OpenSSL:    OpenSSL 3.5.0 8 Apr 2025
[cli][debug] Streamlink: 7.4.0+6.g4dd62f2d
[cli][debug] Dependencies:
[cli][debug]  certifi: 2025.4.26
[cli][debug]  isodate: 0.7.2
[cli][debug]  lxml: 5.4.0
[cli][debug]  pycountry: 24.6.1
[cli][debug]  pycryptodome: 3.23.0
[cli][debug]  PySocks: 1.7.1
[cli][debug]  requests: 2.32.3
[cli][debug]  trio: 0.30.0
[cli][debug]  trio-websocket: 0.12.2
[cli][debug]  urllib3: 2.4.0
[cli][debug]  websocket-client: 1.8.0
[cli][debug] Arguments:
[cli][debug]  --loglevel=debug
[cli][debug]  --player=/usr/bin/mpv
[cli][debug]  --webbrowser-headless=True
usage: streamlink [OPTIONS] <URL> [STREAM]

Use -h/--help to see the available options or read the manual at https://streamlink.github.io/