when your Custom Search integration starts returning 429s, check the clock in Pacific Time before you change anything. The daily quota resets at midnight PT, not midnight in your timezone, so a 429 at 11pm your time can clear an hour later. Build your retry and alerting around that: log quota errors with a PT timestamp, and set your usage alerts to fire well before the end of the PT day. The quota page in the Google Cloud Console shows your current consumption and the reset, so link it in your runbook and dont guess.

Context: Stack Overflow #34623024 (top answer, 19 votes): the question asks when daily quota limits reset across Google APIs. The answer: check the quota page in the developer console, most state the reset time, and the daily quota resets at midnight Pacific Time. That one line saves a lot of confusion when your Custom Search calls start failing at what looks like a random hour.