Supervisor XML-RPC API v3.0 (Supervisor 4.3.0) only supports 2-parameter
readLog(offset, length) calls, not 3-parameter calls with filename.
The SUPERVISOR_LOGFILE environment variable is not used by the API.
Testing showed:
- Working: server.supervisor.readLog(-4096, 0)
- Failing: server.supervisor.readLog(-4096, 4096, '/path/to/log')
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Co-Authored-By: Claude <noreply@anthropic.com>