Grafana GEM 2.17 adds retries and remote read for cross-cluster queries

Grafana Enterprise Metrics (GEM) 2.17 added automatic retries and Prometheus remote read support to its federation-frontend, according to Grafana’s release notes. The retry feature targets individual requests that return retryable errors during cross-cluster queries.

The notes pair those additions with a related bug fix in version 2.17.0: cross-cluster federation could produce unreported partial results if a remote-read stream broke after its first response. Grafana lists that failure as fixed; the notes do not provide test results or a measured reliability improvement.

Operators can control the total number of request attempts with federation.max-attempts-per-request. The notes do not specify its default or identify which errors qualify for another attempt, leaving those details unresolved for anyone planning a configuration change.

Two further federation-frontend controls cover validation and headers. Grafana lists HTTP client cluster-validation support through federation.proxy_targets.cluster_validation_label. It also adds query-frontend.extra-propagated-headers, which lets operators specify extra headers permitted through the rest of the query path.

Outside federation, the gateway gains optional HTTP load balancing for its cortex.query and cortex.distributor proxies. The controls are [proxy].load-balancing and [proxy].load-balancing-policy.

These are documented changes to the 2.17 release, not a dated launch announcement: the captured page gives no original release date. Grafana says GEM 2.17 is built on Mimir 2.17 and inherits its features, fixes and upgrade considerations. For teams upgrading, the company directs readers to the Mimir release notes first and says to update the GEM plugin to its latest version after moving to GEM 2.17.