Ignore backoff warning if in functions environment (#38787)

Author: lzchen

sdk/monitor/azure-monitor-opentelemetry/CHANGELOG.md

@@ -10,6 +10,8 @@
     ([#38543](https://github.com/Azure/azure-sdk-for-python/pull/38543))
 - Configure live metrics first in pipeline to detect statsbeat usage
     ([#37694](https://github.com/Azure/azure-sdk-for-python/pull/37694))
+- Ignore backoff warning from distro if in functions environment
+    ([#38787](https://github.com/Azure/azure-sdk-for-python/pull/38787))
 
 ### Breaking Changes
 

sdk/monitor/azure-monitor-opentelemetry/azure/monitor/opentelemetry/_configure.py

@@ -63,6 +63,7 @@
 )
 from azure.monitor.opentelemetry.exporter._utils import (  # pylint: disable=import-error,no-name-in-module
     _is_attach_enabled,
+    _is_on_functions,
 )
 from azure.monitor.opentelemetry._diagnostics.diagnostic_logging import (
     _DISTRO_DETECTS_ATTACH,
@@ -252,7 +253,7 @@ def _setup_instrumentations(configurations: Dict[str, ConfigurationValue]):
 
 
 def _send_attach_warning():
-    if _is_attach_enabled():
+    if _is_attach_enabled() and not _is_on_functions():
         AzureDiagnosticLogging.warning(
             "Distro detected that automatic attach may have occurred. Check your data to ensure "
             "that telemetry is not being duplicated. This may impact your cost.",