Expose exporter.Handler and allow disabling default registry #2
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The Grafana Agent (https://github.com/grafana/agent) embeds mongodb_exporter as an integration, where it needs to be able to call into the exporter's HTTP handler for its all-in-one server. This endpoint also needs to only return metrics for the exporter itself and not from the global registry, which is populated by unrelated metrics.
This is a temporary PR for use in the Grafana Agent until percona#356 is merged.