Window metal openings

[mikefarm]

If I look at the bottom of each window there is a little metal tab bent in, that looks like it would allow airflow/bugs/dirt etc. Was this suppose to be caulked from the factory? Does this make sense what I'm asking? There are like 2 spot in each window..

[Dayle1]

It allows water to drain out if too much rain leaks around the window seals. Most residential windows have the same drip holes for the same reason.