feat: Disable instrumentation telemetry by default (#423)

Author: astuyve

datadog_lambda/tracing.py

@@ -28,6 +28,10 @@
     send_segment,
     parse_xray_header,
 )
+
+if os.environ.get("DD_INSTRUMENTATION_TELEMETRY_ENABLED") is None:
+    os.environ["DD_INSTRUMENTATION_TELEMETRY_ENABLED"] = "false"
+
 from ddtrace import tracer, patch, Span
 from ddtrace import __version__ as ddtrace_version
 from ddtrace.propagation.http import HTTPPropagator