What's the usage of network_address_inventory and where its data come from?

[f02061232-1]

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I'm trying to create a sla report base on skywalking service_sla_day data. What confused me is that lots of services come from network address inventory. These services is not registered to skywalking by ourselves. I read md file, but got limited information.

For Network Address Inventory, it represents all network address, in IP:port, hostname, domain name formats, which are detected by language agents or other probes.

eg:
{
"_index":"service_inventory",
"_type":"type",
"_id":"1_56",
"_score":0,
"_source":{
"sequence":68,
"heartbeat_time":1574781959840,
"node_type":3,
"mapping_last_update_time":1574782809172,
"name":"service-provider:80",
"address_id":56,
"is_address":1,
"mapping_service_id":64,
"register_time":1574781956854,
"properties":null
}
}

we are using javaagent -javaagent:apache-skywalking-apm-bin/agent/skywalking-agent.jar, how did this agent detect above Network Address (service-provider:80) or service and add to service_inventory index?

[wu-sheng]

If You want to understand this. You need to understand the topology detection. I am trying to write a paper about this, But it is not published yet. You need to read codes.