db.instance can be optional?

[anuraaga]

I am writing some redis instrumentation that uses lettuce's native tracing support, and at least for now it doesn't expose the redis database index to tracing extensions. I have filed an issue to see if it can be added

redis/lettuce#1312

but because in Redis database index is not so common to use, and I can easily imagine other database systems without any concept of an instance / schema, does it make sense to make db.instance optional? Do we expect every single database out there to have this?

[Oberon00]

Hi, can you please take a look if #575 would solve your problem?

[anuraaga]

Ah sorry for missing that PR yup it looks good to me!