Overall Assessment

This PR fixes noisy ERROR+traceback logs in _ping_pong when transient connection errors (ConnectionResetError, BrokenPipeError, etc.) occur during the keep-alive ping send. The fix mirrors the exact classification pattern already used in _sub_routing_loop recv (OPS-3485). No blocking bugs found.

Findings

No actionable findings.

Notes

• TDD followed per AGENTS.md: tests written first (red because send path always emitted ERROR), then made green by the isinstance(e, TRANSIENT_WS_ERRORS) guard.
• Tests are hermetic (<100 ms, no sockets, patch("time.sleep") + side-effect termination) and modeled exactly on the existing recv regression tests.
• TRANSIENT_WS_ERRORS constant (defined at module level, lines 35-40) is reused; the log message for transient cases matches the recv path exactly.
• Version bump, CHANGELOG entry, and CI checks (format/bandit/pytest/lock) all completed as required.