prometheus重啟hang住問題記錄

官方issue並不承認這是一個問題，參考：

https://github.com/prometheus/prometheus/issues/5727

https://github.com/prometheus/prometheus/issues/4324

 

有人認為是磁盤讀寫慢導致的，參考

https://groups.google.com/forum/#!searchin/prometheus-users/prometheus$20hang$20$20component$3Dtsdb$20msg$3D%22found$20healthy$20block%22|sort:date/prometheus-users/SW9sy_-DSxA/BsgasOiTBAAJ