[metricbeat] aws.rds.volume_used.bytes metric missing from RDS metricset

[kaiyan-sheng]

When running rds metricset to collect metrics,aws.rds.volume_used.bytes is missing. This metric came from AWS CloudWatch VolumeBytesUsed metric. When using cloudwatch metricset, I was able to collect this metric.

AWS CLI command to collect VolumeBytesUsed:

aws --region us-west-2 cloudwatch get-metric-statistics --namespace AWS/RDS --metric-name VolumeBytesUsed --start-time 2021-05-11T00:00:00Z --end-time 2021-05-11T01:00:00Z --period 60 --dimensions Name=EngineName,Value=aurora Name=DbClusterIdentifier,Value=cluster-name --statistics Average --query 'sort_by(Datapoints,&Timestamp)[*]'

[elasticmachine]

Pinging @elastic/integrations (Team:Integrations)

[kaiyan-sheng]

This should be fixed by: #26077