bzp2010 commented on issue #11456: URL: https://github.com/apache/apisix/issues/11456#issuecomment-2270328881
Hi, @pavankumar-siripurapu. Although `prometheus` plugin allows you to inject additional labels, it is not feasible to set a field with a high cardinality like uri through a variable. For example, if you use any wildcard routes or variable routes, they will inflate the uri label indefinitely. For `apisix_http_status`, which stores things like `"code", "route", "matched_uri", "matched_host", "service", "consumer", "node", "status_code"`, assuming there are 10 possible values for each, and the uri has 100 possible values, this will eventually generate 10*10*10*10*10*10*10*10*100 active series, totaling 10 billion. This is an immeasurable drain on memory because you can't predict what data your customers will include in the API path. Therefore, 100 possible uri's is just a minimal prediction. In short, please don't include high cardinality values in labels, or strictly limit its range. Do not do this for global configurations in plugin_attr. -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: notifications-unsubscr...@apisix.apache.org For queries about this service, please contact Infrastructure at: us...@infra.apache.org
