Metrics to show Input records to the Throttle plugin

[utkmishr]

I am using fluent-bits throttle filter plugin - https://docs.fluentbit.io/manual/pipeline/filters/throttle , to rate limit the log records in one of my application (Kubernetes based) . I could not find any metric which shows, how many records gets passed through the throttle filter before the throttling occurs. I can see that there is a metrics called 'fluentbit_filter_drop_records_total' which shows the number of dropped records by the filter .
so for example if throttle-plugin process N records and drops M records due to throttling. I can see 'M' using fluentbit_filter_drop_records_total but could not find a way to project "N" on our dashboards.

I tried using fluentbit_filter_add_records_total metric but the count is always 0 for this.
also tried using 'fluentbit_input_records_total' but looks like this metic is an aggregation of processed records by the input plugin (tail plugin) . which is not useful in our scenario since we have multiple throttle filters to do throttling based on tags.

Please let me know if fluent-bit exposes any such metric .