$  make -C generator/_templates/metricbeat test
...

[2020-10-06T10:32:28.526Z] Run
[2020-10-06T10:32:28.526Z] 
[2020-10-06T10:32:28.526Z]   git config --global user.email "you@example.com"
[2020-10-06T10:32:28.526Z]   git config --global user.name "Your Name"
[2020-10-06T10:32:28.526Z] 
[2020-10-06T10:32:28.526Z] to set your account's default identity.
[2020-10-06T10:32:28.526Z] Omit --global to set the identity only in this repository.
[2020-10-06T10:32:28.526Z] 
[2020-10-06T10:32:28.526Z] fatal: unable to auto-detect email address (got 'jenkins@worker-c07ll940dwyl.(none)')
[2020-10-06T10:32:28.526Z] Error: running "git commit -q -m Initial commit, Add generated files" failed with exit code 128
[2020-10-06T10:32:28.526Z] make: *** [prepare-test] Error 128