Default value of OTEL_ATTRIBUTE_VALUE_LENGTH_LIMIT is not working well

[katzchang]

https://docs.splunk.com/observability/en/gdi/get-data-in/application/nodejs/configuration/advanced-nodejs-otel-configuration.html#trace-configuration

This document states that the default value of OTEL_ATTRIBUTE_VALUE_LENGTH_LIMIT is 1200 and that attribute values longer than this will be truncated, but in reality attribute values longer than this may be sent to the backend.

splunk-otel-js/src/tracing/options.ts

Lines 71 to 72 in 648bcf3

	process.env.OTEL_ATTRIBUTE_VALUE_LENGTH_LIMIT =
	getNonEmptyEnvVar('OTEL_ATTRIBUTE_VALUE_LENGTH_LIMIT') ?? '12000';

Looking at the code, it is defined as 12000, which is probably the cause.

So the document or code will need to be fixed.

[seemk]

Thanks! Passed this on, should hopefully be updated soon