I worked at bloomberg for an extended period. Feature flags are seriously used eg. >10k flags added per month across all code. Now, they came with ample managem

I worked at bloomberg for an extended period. Feature flags are seriously used eg. >10k flags added per month across all code. Now, they came with ample management systems to enable/disable, rollout, and check for complete rollout. Various techniques (shared memory, caching) were used to drive down lookup time. Removing them came down to team discipline. Ideally, a Google like clang analysis of code would find flags ready for removal and alter code to remove the old code path. Recall Google used tools like this ro update or migrate deprecated api calls Bbg however never got there. Instead you'd just get various alerts