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This PR adds a new section to the `INFO` command output, called `keysizes`. This section provides detailed statistics on the distribution of key sizes for each data type (strings, lists, sets, hashes and zsets) within the dataset. The distribution is tracked using a base-2 logarithmic histogram. # Motivation Currently, Redis lacks a built-in feature to track key sizes and item sizes per data type at a granular level. Understanding the distribution of key sizes is critical for monitoring memory usage and optimizing performance, particularly in large datasets. This enhancement will allow users to inspect the size distribution of keys directly from the `INFO` command, assisting with performance analysis and capacity planning. # Changes New Section in `INFO` Command: A new section called `keysizes` has been added to the `INFO` command output. This section reports a per-database, per-type histogram of key sizes. It provides insights into how many keys fall into specific size ranges (represented in powers of 2). **Example output:** ``` 127.0.0.1:6379> INFO keysizes # Keysizes db0_distrib_strings_sizes:1=19,2=655,512=100899,1K=31,2K=29,4K=23,8K=16,16K=3,32K=2 db0_distrib_lists_items:1=5784492,32=3558,64=1047,128=676,256=533,512=218,4K=1,8K=42 db0_distrib_sets_items:1=735564=50612,8=21462,64=1365,128=974,2K=292,4K=154,8K=89, db0_distrib_hashes_items:2=1,4=544,32=141169,64=207329,128=4349,256=136226,1K=1 ``` ## Future Use Cases: The key size distribution is collected per slot as well, laying the groundwork for future enhancements related to Redis Cluster.