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benweint avatar benweint commented on July 20, 2024

Hi @tlubz - thanks for writing in to us about this issue!

You're correct that the JS auto-insertion will only work if the <head> tag appears within the first 50KB of the response body.

This limitation was added as a performance safeguard, as scanning through very long response bodies can become a performance problem in some cases. It's meant as a last-ditch backstop, so we're probably not going to make it configurable in the future, nor change the number without significant testing.

You're right that it should be documented though. For cases like this, the best solution is probably to disable automatic instrumentation and use manual instrumentation, which will perform better anyway. I'll get this added to our documentation and close this out once it's posted.

Thanks!
Ben

from newrelic-ruby-agent.

benweint avatar benweint commented on July 20, 2024

Hi @tlubz - this actually is documented already here, so I'm going to close this out. If you still would like to make this work using auto-instrumentation rather than manual instrumentation, then please go ahead and file a feature request via support.newrelic.com. Thanks!

from newrelic-ruby-agent.

tlubz avatar tlubz commented on July 20, 2024

Thanks @benweint! We were able to shrink the size of our <head> tag, which makes this work. We were just very confused for a while. It might be nice to have at least a warning message when it fails to find the tag, though.

Tom

from newrelic-ruby-agent.

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