There are different ways to generate links to Gerrit in Bugzilla comments. Ideally those links should be kept in Phabricator comments.
See https://bugzilla.wikimedia.org/show_bug.cgi?id=72485
Potentially incomplete table. See https://git.wikimedia.org/blob/wikimedia%2Fbugzilla%2Fmodifications.git/HEAD/extensions%2FWikimedia%2FExtension.pm#L47 and https://git.wikimedia.org/blob/wikimedia%2Fbugzilla%2Fmodifications.git/HEAD/extensions%2FWikimedia%2FExtension.pm#L100
| string in comment | to become |
| Iec4f32fdefde15b2330dbb191fb3bbb0d04803e2 | `Iec4f32fdefde15b2330dbb191fb3bbb0d04803e2 ([[ https://gerrit.wikimedia.org/r/#/q/Iec4f32fdefde15b2330dbb191fb3bbb0d04803e2,n,z | Iec4f32fdefde15b2330dbb191fb3bbb0d04803e2]] )` | capital I followed by 8 to 40 hexadecimal digits
| ec4f32fdefde15b2330dbb191fb3bbb0d04803e2 | `ec4f32fdefde15b2330dbb191fb3bbb0d04803e2 ([[ https://gerrit.wikimedia.org/r/#/q/ec4f32fdefde15b2330dbb191fb3bbb0d04803e2,n,z | ec4f32fdefde15b2330dbb191fb3bbb0d04803e2]] )` | between 8 and 40 hexadecimal digits
| [Gg]errit [Cc]hange 10 | `[Gg]errit [Cc]hange 10 ([[ https://gerrit.wikimedia.org/r/10 | Gerrit]] )` | at least two digits |
| [Gg]errit [Cc]hange #10 | `[Gg]errit [Cc]hange #10 ([[ https://gerrit.wikimedia.org/r/10 | Gerrit]] )` |
| [Gg]errit [Cc]hangeset 10 | `[Gg]errit [Cc]hangeset 10 ([[ https://gerrit.wikimedia.org/r/10 | Gerrit]] )` |
| [Gg]errit [Cc]hangeset #10 | `[Gg]errit [Cc]hangeset #10 ([[ https://gerrit.wikimedia.org/r/10 | Gerrit]] )` |