Rollback-Safe Metrics: Choosing Pull Over Push for a Small SaaS Notification Dashboard

A small SaaS team tracking logistics notification failures should, in most cases, start with a pull-based collector feeding a thin custom dashboard, since a faulty metric release can be rolled back alongside the application. A push API is only preferable when jobs are too short-lived or unreachable to be scraped reliably. The author stresses keeping event definitions precise, such as separating retry attempts from final failures so failure-rate charts are not misleading. High-cardinality identifiers like customer IDs and phone numbers should stay out of metric labels and go to logs or traces instead. A schema version label is useful during rollouts to expose mixed populations but should be removed afterward to avoid series multiplication.