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By default, the fallback_application_name for a physical walreceiver is "walreceiver". This means that multiple standbys cannot be distinguished easily on a primary, for example in pg_stat_activity or synchronous_standby_names. If cluster_name is set, use that for fallback_application_name in the walreceiver. (If it's not set, it remains "walreceiver".) If someone set cluster_name to identify their instance, we might as well use that by default to identify the node remotely as well. It's still possible to specify another application_name in primary_conninfo explicitly. Reviewed-by: Euler Taveira <euler@timbira.com.br> Discussion: https://www.postgresql.org/message-id/flat/1257eaee-4874-e791-e83a-46720c72cac7@2ndquadrant.com