If you suspect your RDS is running out of disk space, most likely it is running out it. To confirm you can create CloudWatch alarm on RDS instance metric "Freeable space" to trigger an alarm. In order to create an alarm, you will have to create a "topic" in Amazon SNS service. Once you define a "topic", you will have to click "create subscription". Under "create subscription", you will have to choose "email" as notification method and specify the email address to be notified.
Now you can go back to "Monitoring" page of your RDS and create an alarm. In the alarm, you have specify 3 parameters, Alarm metric threshold (in this particular case, RDS instance metric called "FreeStorageSpace"), alarm action and then like below:-
Alarm metric:-
Now you can go back to "Monitoring" page of your RDS and create an alarm. In the alarm, you have specify 3 parameters, Alarm metric threshold (in this particular case, RDS instance metric called "FreeStorageSpace"), alarm action and then like below:-
Alarm metric:-
Alarm action:-
Alarm preview:-
Once you have created the alarm, you will get an email from no-reply@sns.amazonaws when the threshold is reached.
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