Analytics: resolve redundant-hostnames

[chalin]

Meta issue for the following instances of the redundant-hostnames problem:

• Analytics: resolve redundant-hostnames warning grpc/grpc.io#1012
• Analytics: resolve redundant-hostnames warning prometheus/docs#2208

[chalin]

Will be coordinating with @nate-double-u to make progress on this in 23Q1-Q2.