Function init_tracing 

pub fn init_tracing(config: &Config) -> Result<(), ProxyError>

Initialize the global tracing subscriber.

Set PRAXIS_LOG_FORMAT=json for structured JSON output. Per-module overrides come from runtime.log_overrides in the config YAML.

Errors

Returns ProxyError::Config if any log_overrides entry is invalid.

let config = praxis_core::config::Config::load(None, "listeners: []").unwrap();
praxis_core::logging::init_tracing(&config).unwrap();