Add note about maintenance mode and point users to Google Cloud docs. (…

…#296)
Stackdriver · Jan 6, 2022 · dc0e3d6 · dc0e3d6
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 # Stackdriver Prometheus sidecar
 
+__IMPORTANT__: The Stackdriver Prometheus sidecar is in maintenance mode and
+will not receive any new feature updates.  Please review the recommendations
+in the [Google Cloud documentation](https://cloud.google.com/stackdriver/docs/solutions/gke/prometheus)
+before proceeding with any new deployments.
+
 This repository contains a sidecar for the Prometheus server that can send
 metrics to Stackdriver. This is based on [this design](docs/design.md).