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场景
担心您的应用程序指标可能突然激增#xff0c;以及指标突然激增导致prometheus压力过载
就像生活中的许多事情一样#xff0c;标签要有节制。当带有用户 ID 或电子邮件地址的标签被添加到指标时#xff0c;虽然它不太可能结束…prometheus抓取保护配置以防止压力过载
场景
担心您的应用程序指标可能突然激增以及指标突然激增导致prometheus压力过载
就像生活中的许多事情一样标签要有节制。当带有用户 ID 或电子邮件地址的标签被添加到指标时虽然它不太可能结束因为突然之间您的一个目标可能会在每次抓取时抽出数十万个时间序列从而导致 Prometheus 出现性能问题。
设置scrap抓取指标过载保护
sample_limit 是一个抓取配置字段如果返回的时间序列超过给定数量它将导致抓取失败。默认情况下禁用。例如
scrape_configs:- job_name: my_jobsample_limit: 5000static_configs:- targets:- my_target:1234如果返回的时间序列超过 5000 个将导致目标的抓取失败将 up 设置为 0就好像目标已关闭一样。从那里您可以在抓取时使用普罗米修斯删除指标来删除有问题的指标同时等待应用程序被修复。也就是说metric_relabel_configs在sample_limit之前应用。
各类过载保护汇总
sample_limit
# Per-scrape limit on number of scraped samples that will be accepted.
# If more than this number of samples are present after metric relabeling
# the entire scrape will be treated as failed. 0 means no limit.
[ sample_limit: int | default 0 ]body_size_limit:
# An uncompressed response body larger than this many bytes will cause the
# scrape to fail. 0 means no limit. Example: 100MB.
# This is an experimental feature, this behaviour could
# change or be removed in the future.
[ body_size_limit: size | default 0 ]label_limit
# Per-scrape limit on number of labels that will be accepted for a sample. If
# more than this number of labels are present post metric-relabeling, the
# entire scrape will be treated as failed. 0 means no limit.
[ label_limit: int | default 0 ]label_name_length_limit
# Per-scrape limit on length of labels name that will be accepted for a sample.
# If a label name is longer than this number post metric-relabeling, the entire
# scrape will be treated as failed. 0 means no limit.
[ label_name_length_limit: int | default 0 ]label_value_length_limit
# Per-scrape limit on length of labels value that will be accepted for a sample.
# If a label value is longer than this number post metric-relabeling, the
# entire scrape will be treated as failed. 0 means no limit.
[ label_value_length_limit: int | default 0 ]target_limit
# Per-scrape config limit on number of unique targets that will be
# accepted. If more than this number of targets are present after target
# relabeling, Prometheus will mark the targets as failed without scraping them.
# 0 means no limit. This is an experimental feature, this behaviour could
# change in the future.
[ target_limit: int | default 0 ]
