Different Halo test environments have different Spanner resource needs. For example, the head environment tends to have much lower traffic compared to the qa environment. Spanner autoscaling only supports whole nodes (multiples of 1000 processing units), whereas some test environments are often idle and do not need a whole node. Spanner nodes are relatively expensive (currently $657/month for the us-central1 region).
This also removes the specification of 100 processing nodes for the example Terraform configuration, as that is far below Spanner recommendations.
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1 month ago 
Different Halo test environments have different Spanner resource needs. For example, the
headenvironment tends to have much lower traffic compared to theqaenvironment. Spanner autoscaling only supports whole nodes (multiples of 1000 processing units), whereas some test environments are often idle and do not need a whole node. Spanner nodes are relatively expensive (currently $657/month for the us-central1 region).This also removes the specification of 100 processing nodes for the example Terraform configuration, as that is far below Spanner recommendations.