For metricbeat modules/metricsets that use HTTP hosts, it is actually possible to specify request `headers` in the module configuration. See: https://github.com/elastic/beats/blob/2b1f1e69b018a52dd8d9fddc66dcfaeed2c7cbdb/metricbeat/helper/http.go#L51 However, this setting is currently [not documented](https://www.elastic.co/guide/en/beats/metricbeat/current/configuration-metricbeat.html#module-http-config-options) so we should document it.
For metricbeat modules/metricsets that use HTTP hosts, it is actually possible to specify request
headersin the module configuration. See:beats/metricbeat/helper/http.go
Line 51 in 2b1f1e6
However, this setting is currently not documented so we should document it.