ProxySQL 3.0.4 Release Notes

This release of ProxySQL 3.0.4 includes new features, bug fixes, and improvements across PostgreSQL, MySQL, monitoring, and configuration management.

Release commit: faa64a570d19fe35af43494db0babdee3e3cdc89

New Features:

PostgreSQL:

• Add PostgreSQL-Specific Tokenizer for Query Digest Generation (0f7ff1f3, #5254)
• Add SSL support for backend connections in PGSQL monitor (d1b003a0, #5237)

MySQL:

• Add special handling for unexpected COM_PING packets (e73ba2b6, #5257)
• Added handling of SELECT @@version and SELECT VERSION() without backend (0d55ab5e, #4889)
• [WIP] Setting client side wait_timeout (2b900b34, #4901)
• Implement Fast Forward Grace Close Feature to Prevent Data Loss (83300374, #5203)

Monitoring:

• Add TCP keepalive warnings when disabled (issue #5212) (0c3582f1, #5228)

Bug Fixes:

MySQL:

• Fix: Make cur_cmd_cmnt thread-safe (91e20648, #5259)
• Fix cache_empty_result=0 not caching non-empty resultsets (issue #5248) (2987242d, #5250)
• Fix issue 4855: Incorrect affected rows reporting for DDL queries (d188715a, #5232)

Monitoring:

• Fix artificially high ping latency in MySQL backend monitoring (24e02e95, #5199)

Security:

• Fix SQL injection vulnerability in Read_Global_Variables_from_configfile (automatic prefix stripping) (0b2bc1bf, #5247)

Improvements:

Performance:

• Improve fast forward replication CLIENT_DEPRECATE_EOF validation (closes #5062) (5485bb02, #5240)
• Refactored Prepared-Statement Cache Design (Lock-Free Hot Path) - Part 2 (9c0e14a5, #5225)
• gtid: Refactor reconnect logic & prevent events_count reset (20975923, #5226)

Documentation:

• Documentation additions and bug fix for vacuum_stats() (cf8cbfd8, #5258)
• Permanent FF sessions + check_data_flow docs (ec1247f2, #5245)
• [skip-ci] V3.0.agentics - Add Claude Code Agent Definitions and Architecture Documentation (291e5f02, #5115)
• docs: Add comprehensive Doxygen documentation for GTID refactoring (9a55e974, #5229)
• Add TAP test writing guide and GitHub automation improvements (49899601, #5215)

Testing:

• Add comments to select @@version queries to bypass ProxySQL interception (66119b74, #5251)
• Add fast forward replication deprecate EOF test and update test infrastructure (closes #5062) (9df7407f, #5241)
• Add delay to let ProxySQL process mysql_stmt_close() (fa74de3c, #5198)
• regroup tests to balance group test time (41b0e96c, #5207)

Build/Packaging:

• add opensuse16 packaging (bce71a95, #5230)

Other Changes:

• bump version to 3.0.4 at the beginning of the development cycle (ba664785, #5200)

Hashes

The release commit is: faa64a570d19fe35af43494db0babdee3e3cdc89