[GitHub] [apisix] spacewander commented on issue #5092: memory leak when enable prometheus as global

[GitBox <gi...@apache.org>]

spacewander commented on issue #5092:
URL: https://github.com/apache/apisix/issues/5092#issuecomment-922242153


   First of all, we need to check if the error log is caused by the memory used by Prometheus is unbound or just because the default size is too small.
   
   The configuration of lua shdict is not available until 2.8, so you may need to modify the ngx_tpl.lua: https://github.com/apache/apisix/pull/4524
   
   If the Prometheus memory usage grows without limit, it will consume all the memory configurated. Otherwise, the memory usage stops growing in a level.
   
   We also need to compare the Prometheus metrics before/after the http request. Prometheus client is a well-known memory consumer. How many metrics/labels are there in the Prometheus metrics?
   
   You can also use X-Ray to diagnose the memory issue: https://openresty.com.cn/cn/xray/. Note that I am not the developer of X-Ray (it is a commercial product developed by others).


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