Per host, per month. Ingest, retention and queries are included at every tier. There is no per-gigabyte charge and no charge for running a query, which are the two lines that make observability bills unpredictable.
Nothing is dropped. You are billed for the extra hosts on the next invoice at the same per-host rate, pro rata from the day they appeared. We email the account owner when host count rises more than 20% above the previous month.
We accept OpenTelemetry over OTLP, so if you are already exporting OTel you can point it at us and run both in parallel. Dashboards do not migrate automatically. Most teams rebuild the ten dashboards they actually use and discard the rest.
99.9% on Team, 99.95% on Scale, measured monthly on the ingest and query APIs. Credits are 10% of monthly fee per 0.1% below target, applied automatically without you having to claim.