pub fn append(root: &Path, path: &Path, line: &str) -> Option<()>Expand description
Append one serialized event or batch to path.
Returns None — never an error — when the tombstone is present, when the
line would not fit in one atomic write, or when any filesystem step fails.
Telemetry is fail-open by construction: it never returns an error to a
caller and never blocks a turn, a tool, or process exit.