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Is this redis inside the default Discourse docker container, self hosted Redis elsewhere, or Elasticache Redis? If using Elasticache Redis can you share the instance type?
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Discourse Prometheus can give you redis time per page type, like on the topic page and on the category page. Your graph can give you this? That way we can compare numbers.
Alarming indeed.
Here in Meta (topics show controller) running in AWS Elasticache t2.medium we get around 20ms for p99 and 10ms median.