Yang Li

请教一下, 为什么是用链表?

2

```golang func (b *bucket) Flush(reinsert func(*Timer)) { var ts []*Timer b.mu.Lock() for e := b.timers.Front(); e != nil; { next := e.Next() t := e.Value.(*Timer) b.remove(t) ts = append(ts, t)...

https://github.com/prometheus-community/postgres_exporter/blob/92bdb8755de886b2366de245e559538030ba3668/cmd/postgres_exporter/main.go#L88-L97 default value of datasource when no environment variables `[postgresql://:@]` check is always false

fix #311