Zhu Sheng Li 28b17b529d
Add concurrency option for outbound observation
Add `enableConcurrency` option, false by default.

If it's set as `true`, start probing outbounds concurrently in every
circle of observation. Wait `probeInterval` between observation circles.
2021-10-26 13:09:03 +08:00
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2020-11-25 19:01:53 +08:00