they first introduced container registry, which made us pay for the storage (before you only paid for invocation and egress)
> If your functions are stored in Container Registry, you'll see small charges after you deploy because Container Registry has no free tier. Container Registry's regional storage costs are currently about $0.026 per GB per month.
recently they sent an email telling us new functions are going to use to “Artifact Registry” and prompting to migrate our old functions
> Cloud Functions (2nd gen) exclusively uses Artifact Registry.
Artifact Registry price: $0.10 per GB per month