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が開いてるよ

is open

→ が
phrase Rare #40,858
is open A casual way to point out that something is open. With 穴, it means that something has a hole in it, as in 穴が開いてるよ (There’s a hole in it).
JA: ドアが開いてるよ。
EN: The door is open.

バッグが開いてるよ。

Your bag is open.

冷蔵庫が開いてるよ。

The refrigerator is open.

このバケツ、穴が開いてるよ。

This bucket has a hole in it.

窓が開いてるよ。

The window is open.