Cortex v1.22.0-rc.0 introduces multiple deprecations and removals

The release candidate for Cortex v1.22.0, as detailed in the project's GitHub release notes, announces several significant deprecations and removals. Key changes include the removal of deprecated flags like `-ruler.evaluation-delay-duration`, `-.fifocache.size`, and `-querier.ingester-metadata-streaming`. These flags have been replaced with newer alternatives, and their continued presence in runtime configurations or command lines will now cause failures during startup or reloads. Additionally, obsolete CLI flags that have been no-ops for at least two minor releases have been removed entirely, requiring operators to audit their configurations and command lines to ensure compatibility.

Operators planning to upgrade should carefully review their runtime configurations and command-line arguments for deprecated flags and fields. For example, leftover overrides for `ruler_evaluation_delay_duration` in runtime configs will cause the runtime config module to fail loading, resulting in startup errors or reload failures. Similarly, caches configured with the removed `size` field will start with no capacity, potentially impacting performance. Running tools like `grep` to identify deprecated flags in configurations before upgrading is strongly recommended to avoid operational disruptions. This pattern of strict enforcement aligns with Cortex's ongoing effort to streamline configuration management and remove legacy options.