Please consider adding pyroscope_ prefix to memberlist_client_cluster_members_count

[chewrocca]

Is your feature request related to a problem? Please describe.

Please consider adding the prefix pyroscope_ to memberlist_client_cluster_members_count

Describe the solution you'd like

Ideally the metrics would be pyroscope_memberlist_client_cluster_members_count

Additional context

Similar to this issue in Loki https://github.com/grafana/loki/issues/3140

[chewrocca]

https://github.com/grafana/loki/pull/6439