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#chainhead_header is expected momenterarily to be ahead. If its considerably ahead (e.g more than 5 blocks), then the node is definetely out of sync.
template: geth_chainhead_diff_between_header_block
on: geth.chainhead
class: Workload
type: ethereum_node
component: geth
every: 10s
calc: $chain_head_block - $chain_head_header
units: blocks
warn: $this != 0
crit: $this > 5
delay: down 1m multiplier 1.5 max 1h
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