[KV] Add Configuration Option to Control RocksDB Statistics Collection

[platinumhamburg]

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• I searched in the issues and found nothing similar.

Motivation

RocksDB statistics collection has performance overhead. Users should be able to disable it when:

• RocksDB-level metrics are not needed
• Running in resource-constrained environments
• Troubleshooting performance issues

Solution

New Configuration

Option	Type	Default	Description
kv.rocksdb.statistics.enabled	Boolean	false	Enable RocksDB statistics collection for metrics

Files Modified

• ConfigOptions.java - Add new config option
• KvTablet.java - Read config to control statistics initialization
• RocksDBStatistics.java - Minor optimization: use getLongProperty() instead of getProperty() to reduce JNI memory overhead
• configuration.md - Documentation

Anything else?

Additional Optimization:

Replaced RocksDB.getProperty() with getLongProperty() in statistics collection to avoid unnecessary string allocation in JNI layer during high-frequency Prometheus scraping.

Willingness to contribute

• I'm willing to submit a PR!