NoMethodError: undefined method `[]' for nil:NilClass

• https://sentry.gitlap.com/gitlab/gitlabcom/issues/17167/
• https://sentry.gitlap.com/gitlab/devgitlaborg/issues/17381/

NoMethodError: undefined method `[]' for nil:NilClass
  lib/gitlab/metrics/rack_middleware.rb:73:in `tag_endpoint'
    path = endpoint_paths_cache[endpoint.route.request_method][endpoint.route.path]
  lib/gitlab/metrics/rack_middleware.rb:41:in `call'
    tag_endpoint(trans, env)
  lib/gitlab/middleware/go.rb:16:in `call'
    @app.call(env)
  lib/gitlab/middleware/readonly_geo.rb:29:in `call'
    @app.call(env)
...
(52 additional frame(s) were not displayed)

NoMethodError: undefined method `[]' for nil:NilClass