Werk #11094: AWS RDS

This werk fixes several issues with the AWS RDS monitoring:

• User-defined instance names crashed the AWS special agent if the instance did not exist.

• The restriction of the monitored instances using tags did not work.

• Monitoring two or more regions which contained instances with the same names resulted in duplicate service names. As a result, only the services corresponding to one of the monitored regions were displayed. This is fixed by changing the corresponding service items to contain both the instance name and the region, which makes them unique. For this fix to take effect, users have to re-discover the affected services. Note that this renaming results in a loss of historically recorded metrics. Furthermore, any user-defined rules for these services which use service items might have to be adjusted.

The following services are affected by the change described in the last point above: aws_rds_summary.db_status, aws_rds, aws_rds.cpu_credits, aws_rds.network_io, aws_rds.bin_log_usage, aws_rds.transaction_logs_usage, aws_rds.replication_slot_usage, aws_rds.disk_io, aws_rds.connections, aws_rds.agent_jobs, aws_rds.replica_lag.

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