Method init

libs/@local/telemetry/src/lib.rs:195–220

Initialize the telemetry setup in the current scope. # Errors - [`InitTracingError`], if initializing the [`tracing_subscriber::Registry`] fails.

(self)

    ///
    /// - [`InitTracingError`], if initializing the [`tracing_subscriber::Registry`] fails.
    pub fn init(self) -> Result<impl Drop, Report<InitTracingError>> {
        #[expect(unused)]
        struct DropGuard<T>(T, DefaultGuard);

        #[expect(clippy::empty_drop)]
        impl<T> Drop for DropGuard<T> {
            fn drop(&mut self) {}
        }

        let (registry, telemetry_guard) = self.build()?;
        let default_guard = tracing::dispatcher::set_default(&registry.into());

        // We have to wait until logging is initialized before we can print the warning.
        if std::env::var("RUST_LOG").is_ok() {
            if std::env::var("HASH_GRAPH_LOG_LEVEL").is_ok() {
                warn!(
                    "`HASH_GRAPH_LOG_LEVEL` and `RUST_LOG` are set, `HASH_GRAPH_LOG_LEVEL` has \
                     been used to determine the logging level."
                );
            } else {
                warn!("`RUST_LOG` is set, please use `HASH_GRAPH_LOG_LEVEL` instead");
            }
        }

        Ok(DropGuard(telemetry_guard, default_guard))
    }

    /// Initialize the telemetry setup.
    ///