ArangoDB v3.5 reached End of Life (EOL) and is no longer supported.
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The ArangoDB Kubernetes Operator supports up and down scaling of the number of DB-Servers & Coordinators.
Currently it is not possible to change the number of Agents of a cluster.
The scale up or down, change the number of servers in the custom resource.
Then apply the updated resource using:
kubectl apply -f yourCustomResourceFile.yaml
Inspect the status of the custom resource to monitor the progress of the scaling operation.