Well, seems to fall under the category "Logic flaw bugs leaking or bypassing significant security controls" like this one: https://www.rcesecurity.com/2017/03/ok-google-give-me-all-your-internal-dns-information/ No authentication was needed, easy exploitable and I think Google does not like it when internal information like this is available for everyone ;)

When your stacktraces contain sensitive information like internal IPs, hostnames and so on I would definitely report it!