chore: Change all telemetry logging to DEBUG level

Reduces log noise by changing all telemetry-related log statements
(info, warning, error) to debug level. Telemetry operations are
background tasks and should not clutter logs with operational messages.

Changes:
- Circuit breaker state changes: info/warning -> debug
- Telemetry send failures: error -> debug
- All telemetry operations now consistently use debug level

Author: samikshya-db

src/databricks/sql/telemetry/circuit_breaker_manager.py

@@ -60,16 +60,16 @@ def state_change(self, cb: CircuitBreaker, old_state, new_state) -> None:
         old_state_name = old_state.name if old_state else "None"
         new_state_name = new_state.name if new_state else "None"
 
-        logger.info(
+        logger.debug(
             LOG_CIRCUIT_BREAKER_STATE_CHANGED, old_state_name, new_state_name, cb.name
         )
 
         if new_state_name == CIRCUIT_BREAKER_STATE_OPEN:
-            logger.warning(LOG_CIRCUIT_BREAKER_OPENED, cb.name)
+            logger.debug(LOG_CIRCUIT_BREAKER_OPENED, cb.name)
         elif new_state_name == CIRCUIT_BREAKER_STATE_CLOSED:
-            logger.info(LOG_CIRCUIT_BREAKER_CLOSED, cb.name)
+            logger.debug(LOG_CIRCUIT_BREAKER_CLOSED, cb.name)
         elif new_state_name == CIRCUIT_BREAKER_STATE_HALF_OPEN:
-            logger.info(LOG_CIRCUIT_BREAKER_HALF_OPEN, cb.name)
+            logger.debug(LOG_CIRCUIT_BREAKER_HALF_OPEN, cb.name)
 
 
 class CircuitBreakerManager:

src/databricks/sql/telemetry/telemetry_client.py

@@ -307,7 +307,7 @@ def _send_with_unified_client(self, url, data, headers, timeout=900):
             )
             return response
         except Exception as e:
-            logger.error("Failed to send telemetry with unified client: %s", e)
+            logger.debug("Failed to send telemetry with unified client: %s", e)
             raise
 
     def _telemetry_request_callback(self, future, sent_count: int):