Your nines are not my nines
Million times this.Its shocking how "elevated rate of errors for specific endpoint" in your cloud provider status page is actually amplified to be a soft-outage of your product when your writes to disk never return, your databases returning inconsistent data or your orchestration taking some drastic measures for the failing health check.When you have a lot of components in your cloud mix, failure of one stage(network->balancing->quering->rendering->persistence) bring everything down.if 10 of your cloud services each have a reliability of 99.999, all together the reliability is not 99.999.cloud providers can claim mountain-high availablity whereas users will never get their apps running with advertised reliability for now there is multiple subcomponents that can fail.