Using clusters causes the automatic service detection to stop working

[rochdev]

Describe the bug

Using clusters causes the automatic service name detection to stop working, resulting in the traces not being reported properly unless the service name is explicitly set.

Environment

• Operation system: N/A
• Node version: N/A
• Tracer version: N/A
• Agent version: N/A

Bug was reported on public Slack so the above information is not available.