Update ApproximateAgeOfOldestMessage.md
Add units of measure (seconds)
---
title: ApproximateAgeOfOldestMessage
-brief: The approximate age of the oldest non-deleted message in the queue.
+brief: The approximate age of the oldest non-deleted message in the queue, in seconds.
metric_type:
---
### ApproximateAgeOfOldestMessage
-The approximate age of the oldest non-deleted message in the queue.
+The approximate age of the oldest non-deleted message in the queue, in seconds.
