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terraform
Terraform enables you to safely and predictably create, change, and improve infrastructure. It is a source-available tool that codifies APIs into declarative configuration files that can be shared amongst team members, treated as code, edited, reviewed, and versioned.
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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
That being said, since the rest of your system appears to be in GCP already, I invite you to take a look at our terraform module.
This allows you to configure and manage ZeroTier via Terraform. You could even extend that to managing your GCP instances themselves via terraform (among other thing).