Don't roll your own high cardinality analytics, use Workers Analytics Engine

Introduces Workers Analytics Engine, a new service for developers to store and analyze high-cardinality, time-series data generated by Cloudflare Workers. Highlights its use in powering Instant Logs by tracking request rates across sessions and data centers. Explains the underlying ABR technology for fast, interactive queries and the use of `_sample_interval` for reconstructing original event counts. Details improvements made for the open beta, including enhanced error messaging and comprehensive documentation. Mentions future plans for alerts, named fields, and a dashboard UX similar to Grafana.