# Rate limit¶

## Statistics¶

Every configured rate limit filter has statistics rooted at ratelimit.<stat_prefix>. with the following statistics:

Name Type Description
total Counter Total requests to the rate limit service
error Counter Total errors contacting the rate limit service
over_limit Counter Total over limit responses from the rate limit service
ok Counter Total under limit responses from the rate limit service
cx_closed Counter Total connections closed due to an over limit response from the rate limit service
active Gauge Total active requests to the rate limit service
failure_mode_allowed Counter Total requests that were error(s) but were allowed through because of failure_mode_deny set to false.

## Runtime¶

The network rate limit filter supports the following runtime settings:

ratelimit.tcp_filter_enabled
% of connections that will call the rate limit service. Defaults to 100.
ratelimit.tcp_filter_enforcing
% of connections that will call the rate limit service and enforce the decision. Defaults to 100. This can be used to test what would happen before fully enforcing the outcome.