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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.
After Jenkins and Gitlab, finally settled with GoCD. https://www.gocd.org/ Also runs without a DB and has static or elastic agents. Fits great with LXD containers as Build Agents.
Concourse is great once you understand it conceptually. Like all tools, it doesn't work for every application, so you need to decide if it's right for you or not. That doesn't make it dogshit, and there are certainly ways to store state for things like Terraform, though I don't know why you'd use Concourse to apply TF when there are a thousand better tools to do that.
Drone was good until they sold to Harness. The community is still building it for free here: https://github.com/woodpecker-ci/woodpecker