I recently started working on these existing MySQL RDS instances, which don't have Enhanced monitoring turned on, some have no logs going to file or Cloud Watch. (yeah I know)

Unfortunately adding any of these instances to PMM causes ALL the RDS CloudWatch metrics collection to fail. 

• All the graphs at the bottom of the MySQL Overview show nothing

• Cloud Amazon RDS / Aurora MySQL Metrics Grafana page displays a red message with  Templating init failed - Metric request error

• The pmm-rds_exporter-9042.service crashes and restarts endlessly

I have confirmed this by using a test instance of PMM and adding to it just 1 host which I know has Enhanced monitoring on & logs enabled.  With that setup I get graphs at the bottom - but I still get the Templating init failed.

This should be more robust and collect the metrics that it can. CloudWatch (non-enhanced) is showing metrics in the AWS console, so there is a lot which can be pulled down anyway.

1.  

   # /var/log/pmm-rds_exporter-9042.log time="2019-02-27T20:08:10Z" level=info msg="Starting RDS exporter (version=, branch=, revision=)" source="main.go:30" time="2019-02-27T20:08:10Z" level=info msg="Build context (go=go1.10.1, user=, date=)" source="main.go:31" time="2019-02-27T20:08:10Z" level=info msg="Creating sessions..." component=sessions source="sessions.go:35" Region Instance Resource ID Interval us-east-1 db-prod db-Axxxxxxxxxxxxxxxxxxxxxxxxx 0s us-east-1 db-prod-read-east-1d db-Fxxxxxxxxxxxxxxxxxxxxxxxxxx 0s us-east-1 db-staging db-Hxxxxxxxxxxxxxxxxxxxxxxxxxx 1m0s us-west-1 db-prod-read-west-1 db-Cxxxxxxxxxxxxxxxxxxxxxxxxxx 0s time="2019-02-27T20:08:11Z" level=info msg="Using 2 sessions." component=sessions source="sessions.go:149" time="2019-02-27T20:08:11Z" level=info msg="Updating enhanced metrics every 10s." component=enhanced source="collector.go:49" time="2019-02-27T20:08:11Z" level=error msg="Failed to filter log events: ResourceNotFoundException: The specified log stream does not exist.\n\tstatus code: 400, request id: 684debf0-3acb-11e9-a2f8-ada7e9bd4a87." component=enhanced source="scraper.go:109" time="2019-02-27T20:08:11Z" level=info msg="Updating enhanced metrics every 10s." component=enhanced source="collector.go:49" time="2019-02-27T20:08:11Z" level=error msg="Failed to filter log events: ResourceNotFoundException: The specified log group does not exist.\n\tstatus code: 400, request id: 68723d54-3acb-11e9-898d-b1893eccff58." component=enhanced source="scraper.go:109" panic: collector has no descriptorsgoroutine 1 [running]: github.com/percona/rds_exporter/vendor/github.com/prometheus/client_golang/prometheus.(*Registry).MustRegister(0xc420589c00, 0xc4201c3ea8, 0x1, 0x1) /home/builder/rpm/BUILD/rds_exporter-e71e0f3b4f101cf84191052834e3af3d774a0aa9/src/github.com/percona/rds_exporter/vendor/github.com/prometheus/client_golang/prometheus/registry.go:404 +0x9e main.main() /home/builder/rpm/BUILD/rds_exporter-e71e0f3b4f101cf84191052834e3af3d774a0aa9/src/github.com/percona/rds_exporter/main.go:58 +0x570

1.  

   # /var/log/messages Feb 27 22:09:11 ip-10-9-2-9 systemd: pmm-rds_exporter-9042.service holdoff time over, scheduling restart. Feb 27 22:09:11 ip-10-9-2-9 systemd: Started pmm-rds_exporter-9042. Feb 27 22:09:11 ip-10-9-2-9 systemd: Starting pmm-rds_exporter-9042... Feb 27 22:09:11 ip-10-9-2-9 systemd: pmm-rds_exporter-9042.service: main process exited, code=exited, status=2/INVALIDARGUMENT Feb 27 22:09:11 ip-10-9-2-9 systemd: Unit pmm-rds_exporter-9042.service entered failed state. Feb 27 22:09:11 ip-10-9-2-9 systemd: pmm-rds_exporter-9042.service failed.