Obsolete and remove adaptive directory caching strategy

src/Orleans.Runtime/Configuration/Options/GrainDirectoryOptions.cs

@@ -16,6 +16,7 @@ public enum CachingStrategyType
             /// <summary>Standard fixed-size LRU.</summary>
             LRU,
             /// <summary>Adaptive caching with fixed maximum size and refresh. This option should be used in production.</summary>
+            [Obsolete("Adaptive caching is deprecated in favor of LRU and will be removed in a future version. This value is now an alias for LRU.")]
             Adaptive,
             /// <summary>Custom cache implementation, configured by registering an <see cref="IGrainDirectoryCache"/> implementation in the dependency injection container.</summary>
             Custom
@@ -48,31 +49,37 @@ public enum CachingStrategyType
         /// <summary>
         /// Gets or sets the initial (minimum) time, in seconds, to keep a cache entry before revalidating.
         /// </summary>
+        [Obsolete("InitialCacheTTL is deprecated and will be removed in a future version.")]
         public TimeSpan InitialCacheTTL { get; set; } = DEFAULT_INITIAL_CACHE_TTL;
 
         /// <summary>
         /// The default value for <see cref="InitialCacheTTL"/>.
         /// </summary>
+        [Obsolete("DEFAULT_INITIAL_CACHE_TTL is deprecated and will be removed in a future version.")]
         public static readonly TimeSpan DEFAULT_INITIAL_CACHE_TTL = TimeSpan.FromSeconds(30);
 
         /// <summary>
         /// Gets or sets the maximum time, in seconds, to keep a cache entry before revalidating.
         /// </summary>
+        [Obsolete("MaximumCacheTTL is deprecated and will be removed in a future version.")]
         public TimeSpan MaximumCacheTTL { get; set; } = DEFAULT_MAXIMUM_CACHE_TTL;
 
         /// <summary>
         /// The default value for <see cref="MaximumCacheTTL"/>.
         /// </summary>
+        [Obsolete("DEFAULT_MAXIMUM_CACHE_TTL is deprecated and will be removed in a future version.")]
         public static readonly TimeSpan DEFAULT_MAXIMUM_CACHE_TTL = TimeSpan.FromSeconds(240);
 
         /// <summary>
         /// Gets or sets the factor by which cache entry TTLs should be extended when they are found to be stable.
         /// </summary>
+        [Obsolete("CacheTTLExtensionFactor is deprecated and will be removed in a future version.")]
         public double CacheTTLExtensionFactor { get; set; } = DEFAULT_TTL_EXTENSION_FACTOR;
 
         /// <summary>
         /// The default value for <see cref="CacheTTLExtensionFactor"/>.
         /// </summary>
+        [Obsolete("DEFAULT_TTL_EXTENSION_FACTOR is deprecated and will be removed in a future version.")]
         public const double DEFAULT_TTL_EXTENSION_FACTOR = 2.0;
 
         /// <summary>