(DOCSP-43139): Backports DOCSP-42504 to v6.0. (#332)

@jwilliams-mongo, added a missing redirect.

<!-- Add a description of your PR here (optional) -->

- [DOCSP-42504](https://jira.mongodb.org/browse/42504)
-
[STAGING](https://preview-mongodbcorryroot.gatsbyjs.io/ops-manager/DOCSP-42504/)

- [LATEST BUILD
LOG](https://workerpool-boxgs.mongodbstitch.com/pages/job.html?collName=queue&jobId=66cf2f9ec87522bd3a301bf3)

- [ ]
[Define](https://wiki.corp.mongodb.com/display/DE/Taxonomy+tagging+instructions)
taxonomy
[values](https://wiki.corp.mongodb.com/display/DE/Docs+Taxonomy) at top
of page.
- [ ] Add genre facets (tutorial or reference), as in this [example
PR](10gen/cloud-docs#5042).
- [ ] Add programmingLanguage (if necessary).
- [ ] Add meta keywords (if necessary).
- [ ] Resolve any new warnings or errors in the build.
- [ ] Proofread for spelling and grammatical errors.
- [ ] Check staging for rendering issues.
- [ ] Confirm links are working.

Author: corryroot

config/redirects-onprem

@@ -11,6 +11,7 @@ symlink: current -> v5.0
 # Base URL
 raw: ${bucket_prefix}/ -> ${base}/current/
 raw: ${bucket_prefix}/index.html -> ${base}/current/
+raw: ${bucket_prefix}/tutorial/prometheus-integration/ -> ${base}/current/tutorial/prometheus-integration/
 
 ########