SDK should automatically truncate large values

[NathanielRN]

There are some cases where instrumentations are individually truncating large byte values such as is used in both the boto and botocore instrumentations.

opentelemetry-python-contrib/instrumentation/opentelemetry-instrumentation-botocore/src/opentelemetry/instrumentation/botocore/__init__.py

Lines 159 to 166 in 5d4a5b5

	def truncate_arg_value(value, max_len=1024):
	"""Truncate values which are bytes and greater than `max_len`.
	Useful for parameters like "Body" in `put_object` operations.
	"""
	if isinstance(value, bytes) and len(value) > max_len:
	return b"..."
	return value

We should have a solution for the OTel SDK to automatically truncate span attribute values which are above some maximum length. This maximum length should be configurable.

This way all instrumentations and exporters can get this truncating behavior for free.

[github-actions]

This issue was marked stale due to lack of activity. It will be closed in 30 days.

[owais]

Would be nice to have. Splunk distro implements this as well: https://github.com/signalfx/splunk-otel-python#all-configuration-options (SPLUNK_MAX_ATTR_LENGTH)

[danielgblanco]

This should be now covered by open-telemetry/opentelemetry-python#2051?