Follow-up from "Add Clusters Regex for New Banzai Cluster Metric Embed Filter"

The following discussions from !24601 (merged) should be addressed:

@splattael started a discussion:
Not blocking: We can omit the character class if it only includes one character.
```
                  /?
```
@splattael started a discussion:

Not blocking: We could move this to path_suffix_pattern 🤔

Edited Feb 14, 2020 by Allison Browne