balancer在连接前会检测该出站是否可用吗?

[Weltolk]

balancer在连接前会检测该出站是否可用吗?

[vrnobody]

不会。检测工作是由“burstObservatory”或者“observatory"负责，他们会把检测结果记录下来。leastLoad和leastPing挑节点的时候会使用这些信息。而random和roundRobin则不需要这些信息。

[vrnobody]

Observatory is a very old feature, and burstObservatory is a new feature added later. Now we can just use burstObservatory. The subtle difference between those two is that observatory can do sequential probing, while burstObservatory can only probe in random order.

[engAmirEng]

Ok but with burstObservatory on and observatory off the results of delays are not shown in metrics from what I experienced

[vrnobody]

I don't know why it doesn't work on your side. But I can get "delay" and "health_ping" information with the following config.

{
  "log": {
    "loglevel": "debug"
  },
  "metrics": {
    "tag": "metrics",
    "listen": "127.0.0.1:1111"
  },
  "burstObservatory": {
    "subjectSelector": [
      "proxy"
    ],
    "pingConfig": {
      "destination": "https://www.google.com/generate_204",
      "connectivity": "",
      "interval": "10s",
      "sampling": 2,
      "timeout": "30s"
    }
  },
  "outbounds": [
    {
      "tag": "proxy1"
      ...
    },
    {
      "tag": "proxy2"
      ...
    }
  ]
}

[engAmirEng]

when observatory is present in the config then in /debug/vars I get this format:

"freedom": {
    "alive": true,
    "delay": 848,
    "outbound_tag": "freedom",
    "last_seen_time": 1757453485,
    "last_try_time": 1757453485
  }

but when only burstObservatory is present in the config then I get this format:

 "freedom": {
    "alive": true,
    "delay": 700,
    "outbound_tag": "freedom",
    "health_ping": {
      "all": 3,
      "deviation": 565384053,
      "average": 700753601,
      "max": 1500322140,
      "min": 298458022
    }
  }

what is going on?
it is obvious that last_try_time is a crucial piece that is missing when burstObservatory is set and observatory is not

[vrnobody]

I didn't dig that deep. You need to read the source code

[Weltolk]

不会。检测工作是由“burstObservatory”或者“observatory"负责，他们会把检测结果记录下来。leastLoad和leastPing挑节点的时候会使用这些信息。而random和roundRobin则不需要这些信息。

leastLoad和leastPing是balancer的strategy? 文档里貌似没有

#3164

#323

目前的需求这个issue里有提, 连接之前检测是否可用

[vrnobody]

没多少人喜欢写文档，新功能只能看发布说明：https://github.com/XTLS/Xray-core/releases
我没注意到那两个issue，看来我的信息又落伍了，需要更新了。