Add Metrics to track Terraform state backend usage

Goal

Track number of Terraform state files we manage

Definition of done

• Add metric for total number of Terraform state files we manage
• Ensure events are reflected on a dashboard in Periscope

Notes

Pair with @nagyv-gitlab

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@nicholasklick

I see two options immediately:

• number of Terraform state files we manage
• number of times we write a state file (API requests)

I'd go for former: the number of Terraform state files we manage. This basically measures the number of Terraform projects built on our tooling.

What do you think?

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@nagyv-gitlab Those seem like a good start.

@nicholasklick I'd choose just one metric, not 2. It should be an MVC after all.

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@nicholasklick Does it matter if we are on gitlab.com or on-prem? Can we use the same data collection mechanism (usage_ping)?

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