adding more information about process(es) cpu and memory usage

During current encounters with amazon web services - RDS, the DBA does not have access to OS/linux shell of underlying instance. That render some postgresql monitoring technique of process CPU and memory usage, not useful. Even if the AWS provide internal tools/programming interface for monitoring, it could be very useful to have this information provided by postgresql system table(s)/view/functions/api. The information about how much postgresql background/process is using CPU (similar to command top result) and memory. it could be something as simple as adding cpu,memory information fields to pg_stat_activity.