Rocket Validator automatically checks your pages on the W3C Validator.
HTML issues tagged as aria-label.
aria-label attribute is used to define a string that labels the current element. Use it in cases where a text label is not visible on the screen. This attribute does not work consistently with all HTML elements, so the W3C validator is warning about a possible misuse.
When was the last time you validated your whole site?
Keep your sites healthy checking for A11Y/HTML issues on an automated schedule.