How to find web_src_path for Graylog?

Question

graylog

There was a need to make a notification to the slack from the graylog. For this, I chose the plugin https://github.com/sportalliance/graylog-plugin-sl... . Greylog version 3.3.2. To build the plugin, you must specify such a thing as web_src_path. As an example, the path /graylog2-server/graylog2-web-interface is indicated, but I don’t have anything close to it. Is it /graylog-server and there are all sorts of plugins and binaries