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-rw-r--r--doc/book/cookbook/upgrading.md4
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diff --git a/doc/book/cookbook/upgrading.md b/doc/book/cookbook/upgrading.md
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+++ b/doc/book/cookbook/upgrading.md
@@ -17,6 +17,10 @@ Conversely, for versions that only require a minor upgrade, the first nonzero co
Major upgrades are designed to be run only between contiguous versions.
Example: migrations from v0.7.1 to v0.8.0 and from v0.7.0 to v0.8.2 are supported but migrations from v0.6.0 to v0.8.0 are not supported.
+The `garage_build_info`
+[Prometheus metric](@/documentation/reference-manual/monitoring.md) provides
+an overview for which Garage versions are currently in use within a cluster.
+
## Minor upgrades
Minor upgrades do not imply cluster downtime.