Is there a way to add custom tags in Zipkin tracing ?

Today Zipkin trace logs 2 custom tags namely `http.method` & `http.path`. Is there a way to add more custom tags like `instanceId`.

Also `Server` trace displays only the IPAddress and there is no `port` displayed in the address. How to configure the tracing log to show port along with IP address?

No files, tests, or entry points are named. Start by locating the Zipkin tracing configuration and checking how custom tags and server addresses are produced; done means establishing whether instanceId tags and ports can be shown in the trace output and documenting or implementing the required behavior.

Written by the indexing model from the issue text.