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I want to know why prometheus is not suitable for billing system.
the Prometheus overview page says
If you need 100% accuracy, such as for per-request billing, Prometheus is not a good choice as the collected data will likely not be detailed and complete enough.
I don't really understand 100% accuracy. Does it mean "the prometheus's monitoring data is not accurate"?
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What Is Prometheus? Prometheus is a monitoring solution for recording and processing any purely numeric time-series. It gathers, organizes, and stores metrics along with unique identifiers and timestamps. Prometheus is open-source software that collects metrics from targets by "scraping" metrics HTTP endpoints.
Prometheus is typically used to collect numeric metrics from services that run 24/7 and allow metric data to be accessed via HTTP endpoints. This can be done manually or with various client libraries.
Using Prometheus, you can monitor application metrics like throughput (TPS) and response times of the Kafka load generator (Kafka producer), Kafka consumer, and Cassandra client. Node exporter can be used for monitoring of host hardware and kernel metrics.
Prometheus is a free software application used for event monitoring and alerting. It records real-time metrics in a time series database (allowing for high dimensionality) built using a HTTP pull model, with flexible queries and real-time alerting.
Prometheus prefers reliability over 100% accuracy, so there are tradeoffs where a tiny amount of data may be lost rather than taking out the whole system. This is fine for monitoring, but rarely okay when money is involved.
See also https://www.robustperception.io/monitoring-without-consensus/
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