More Robust Code for Sending Metrics to Graphite

Why it matters

This feature addresses the issue of metrics not being sent reliably to Graphite during long-running multiple RENAME TABLE operations. It ensures continuous and stable metrics reporting, which is crucial for monitoring and maintaining ClickHouse clusters effectively.

How to use it

The improvement works transparently without requiring explicit user configuration. Metrics sending to Graphite will now be more stable during RENAME TABLE operations without any changes needed in user actions.