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core: emit node evals only for sys jobs in dc (#12955)
Whenever a node joins the cluster, either for the first time or after being `down`, we emit a evaluation for every system job to ensure all applicable system jobs are running on the node. This patch adds an optimization to skip creating evaluations for system jobs not in the current node's DC. While the scheduler performs the same feasability check, skipping the creation of the evaluation altogether saves disk, network, and memory.
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```release-note:improvement | ||
core: On node updates skip creating evaluations for jobs not in the node's datacenter. | ||
``` |
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