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We did run into some trouble mid-month when some routine maintenance went awry, and we had to fail over to our replica over the weekend of September 15 and 16. The total amount of downtime was about 90 minutes total over the course of the weekend, but the replica kept the problem from clobbering our service completely.
After that we had pretty smooth sailing for the rest of the month. Just 16 minutes of downtime for the rest of the month.