Logging: rate limit fronted logging endpoint (#29272)

Co-authored-by: Arve Knudsen <arve.knudsen@gmail.com>
Co-authored-by: achatterjee-grafana <70489351+achatterjee-grafana@users.noreply.github.com>

docs/sources/administration/configuration.md

@@ -882,6 +882,8 @@ Enable daily rotation of files, valid options are `false` or `true`. Default is
 
 Maximum number of days to keep log files. Default is `7`.
 
+<hr>
+
 ## [log.syslog]
 
 Only applicable when "syslog" used in `[log]` mode.
@@ -908,6 +910,34 @@ Syslog tag. By default, the process's `argv[0]` is used.
 
 <hr>
 
+## [log.frontend]
+
+### enabled
+
+Sentry javascript agent is initialized. Default is `false`.
+
+### sentry_dsn
+
+Sentry DSN if you want to send events to Sentry
+
+### custom_endpoint
+
+Custom HTTP endpoint to send events captured by the Sentry agent to. Default, `/log`, will log the events to stdout.
+
+### sample_rate
+
+Rate of events to be reported between `0` (none) and `1` (all, default), float.
+
+### log_endpoint_requests_per_second_limit
+
+Requests per second limit enforced per an extended period, for Grafana backend log ingestion endpoint, `/log`. Default is `3`.
+
+### log_endpoint_burst_limit
+
+Maximum requests accepted per short interval of time for Grafana backend log ingestion endpoint, `/log`. Default is `15`.
+
+<hr>
+
 ## [quota]
 
 Set quotas to `-1` to make unlimited.