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Billing DB dashboard empty after a host migration: trace the stale scrape target and fix only that job

Billing DB dashboard empty after a host migration: trace the stale scrape target and fix only that job: a task in agent-harbor-tasks (Harbor dataset). Finance says the "Billing DB" dashboard has been missing data for one database instance since last week (INC-5120), and the billing replication-lag…

The task

Finance says the "Billing DB" dashboard has been missing data for one database instance since last week (INC-5120), and the billing replication-lag alert can't fire for it either. The Prometheus config, its logs, targets, dashboards, our inventory, tickets and copies of the hosts' exporter settings are under /workdir.

Part of efederici/agent-harbor-tasks.