[politelemon]

I wouldn't say a new trend, it did go through a hype cycle a few years ago, and some teams have adopted it. I definitely wouldn't call it a standard practice though, as it brings with its own overhead. In effect you've got "byte in memory as a service" with its own deployment, maintenance, and statefulness. It's only useful if you have a business model that really relies on having this capability. That could be in a sufficiently large, already complex, sprawling application estate, having a single flag in a central location could be useful if several pieces of your sprawling estate need it.