Function add_note_line 

pub fn add_note_line(commit: &str, line: &str) -> Result<()>

Appends a note line to a specific commit with exponential backoff retry logic.

This function adds a single line to the git notes associated with the specified commit in the performance notes ref (refs/notes/perf-v3). The operation is retried with exponential backoff to handle transient failures such as concurrent write conflicts or filesystem locks.

Arguments

• commit - The commit hash (or committish reference) to add the note to
• line - The text content to append to the commit’s notes

Returns

• Ok(()) - The note line was successfully added
• Err - If the operation fails permanently or times out after retries

Errors

Returns an error if:

• The commit does not exist
• The operation times out after exhausting retry attempts
• A permanent failure occurs (e.g., invalid commit reference)

Examples

add_note_line("HEAD", "benchmark_result=1.23s").unwrap();