make this code more readable:

1. extract condition contents to separate function,
2. don't use else
3. you don't need sync.Map as it already under mutex
4. use map[string]bool — we don't need to optimize memory here
5. what does run syncer at single throttle for one pipeline mean? run sync only once per pipeline?

e.g

limitersMu.Lock()
if !limiterSyncMap[p.pipeline] {
    limiterSyncMap[p.pipeline] = true
    runSync(p.pipeline)
}
limitersMu.Unlock()

About point num 3: it's not sync map, just named sync to show it's purpose. I will rename it to avoid ambiguity

Point 5: Correct, I meant run sync only once per pipeline, I renamed with this suggestion.

All done except point 4: map[string]struct{} suits better then map[string]bool

1. code separated is func
2. else removed
3. it's not sync.Map, renamed to avoid ambiguity
4. leaved as is
5. changed comment