get RDS tags using AWS cli , this really seems too complicated

get_rds_tags

#!/bin/bash

REGION="us-east-1"
PROFILE="prod"

get_account_id(){
	aws ec2 describe-security-groups \
	   	--group-names 'Default'  \
     		--query 'SecurityGroups[0].OwnerId' \
	    	--output text \
		--profile "$PROFILE"
}

ACCOUNT_ID=$(get_account_id)

list_rds() {
	aws rds describe-db-instances \
		--query "DBInstances[].[DBInstanceIdentifier]" \
		--output text \
		--profile "$PROFILE"
}

get_rds_tags() {
	aws rds list-tags-for-resource --resource-name "$1" \
		--query "TagList[]" \
		--output text \
		--profile "$PROFILE"

		# --query "TagList[?Key == 'vnoc-rsg']" \
		# --query "TagList[?(Key =='project' ||Key == 'vnoc-rsg')]" \
}

for id in $(list_rds)
do
	echo arn:aws:rds:$REGION:$ACCOUNT_ID:db:$id
	get_rds_tags arn:aws:rds:$REGION:$ACCOUNT_ID:db:$id
	echo ""
done

This is still the only way to do it it seems.

I came up with this one liner and it seemed to work for me:
aws rds describe-db-instances --query "DBInstances[].DBInstanceArn" | grep "arn" | awk -F "," '{print $1}' | xargs -i sh -c 'echo {}; aws rds list-tags-for-resource --resource-name {}'

From this issue you can now do this with the resourcegroupstaggingapi

aws resourcegroupstaggingapi get-resources --resource-type-filters rds:db --tag-filters Key=Level