This environment variable specifies a region substitution to apply when constructing Azure Blob storage paths during recovery. The format is source-region/target-region. It is deployed only on the secondary (standby) cluster when dr="standby" and is removed when promoting to dr="active". Removing this variable changes the HumioCluster spec and may cause the operator to restart pods during promotion.

During reverse recovery (failback), this value is inverted: <secondary-region>/<primary-region>. The snapshot's region references are patched to the primary's region.