<PackageReference Include="Microsoft.Extensions.Caching.Abstractions" Version="10.0.12" />

Microsoft.Extensions.Caching.Memory.EvictionReason

public enum EvictionReason
Specifies the reasons why an entry was evicted from the cache.
namespace Microsoft.Extensions.Caching.Memory { public enum EvictionReason { None, Removed, Replaced, Expired, TokenExpired, Capacity } }