Prometheus中scrape_interval参数的最小取值是多少？是否支持毫秒级采集？

Short answer: No, Prometheus doesn't support millisecond scraping intervals for the scrape_interval parameter.

Let me break down the details clearly:

• Configuration validation constraints: Prometheus requires all duration parameters (including scrape_interval) to follow a strict syntax: an integer number followed by a valid time unit (ms, s, m, h, d, w, y). This means decimal values like 0.01s are immediately rejected because they don’t match the required regex. Even though 1ms uses a valid unit, Prometheus enforces a minimum effective scrape interval of 1 second—any smaller value will either be rejected in config validation or silently bumped up to 1s.

• Underlying technical limitations: Prometheus’ scraping pipeline, storage layer, and target interaction logic are all optimized for second-level (or coarser) granularity. Scraping targets every millisecond would not only flood your monitored services with an unmanageable number of HTTP requests but also overwhelm Prometheus itself, as it can’t ingest, process, or store samples at that frequency reliably.

If your business scenario truly demands millisecond-level metric collection, here are practical workarounds:

• Use an intermediate high-frequency collector: Tools like StatsD can collect metrics at millisecond intervals, then aggregate and flush the data to Prometheus every 1 second. This lets you capture the granular data you need while keeping Prometheus operating within its designed capabilities.
• Switch to a tool optimized for high-frequency monitoring: Platforms like InfluxDB (paired with Telegraf) natively support sub-second collection intervals if you need to retain raw millisecond samples.

内容的提问来源于stack exchange，提问作者user7767496