fix: inject error of pushgateway #1780

[Terencesun]

Hi,
Pushgateway is not working, because the unit test did cover the situation about the inject process in another provider

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fix the unit test and export the pushgateway in the PrometheusModule

• refer to I can't push with pushgateway #1780

[willsoto]

@Terencesun Nice! Great work producing a test case too. This makes sense to me. Do you mind giving me permission to push changes to your fork? Just a couple of code clean-up things I'd like to add.

[Terencesun]

@willsoto Hi, I had Invited u to the fork, and u can change the code

[willsoto]

🎉 This issue has been resolved in version 5.2.1 🎉

The release is available on:

• GitHub release
• npm package (@latest dist-tag)

Your semantic-release bot 📦🚀