chore: move some functions to Cli struct (#3961)

crates/tracing/Cargo.toml

@@ -11,5 +11,5 @@ description = "tracing helpers"
 [dependencies]
 tracing.workspace = true
 tracing-subscriber = { version = "0.3", default-features = false, features = ["env-filter", "fmt"] }
-tracing-appender = "0.2"
+tracing-appender.workspace = true
 tracing-journald = "0.3"

crates/tracing/src/lib.rs

@@ -68,6 +68,7 @@ where
 ///
 /// The boxed layer and a guard is returned. When the guard is dropped the buffer for the log
 /// file is immediately flushed to disk. Any events after the guard is dropped may be missed.
+#[must_use = "tracing guard must be kept alive to flush events to disk"]
 pub fn file<S>(
     filter: EnvFilter,
     dir: impl AsRef<Path>,