Can the exporter also track message sizes?

[TobiasScheuer]

All of the documentation revolves around extracting values from inside of the messages, but for one of my metrics I'd like to visualize message throughput in KB/s. Overall message frequency is possible with mqtt2prometheus_received_messages_total which is exported by default.
Do any of you know if one can maybe engineer the mqtt2prometheus config file to output message size?

[hikhvar]

The config file itself not. The mqtt2prometheus_received_messages_total is computed by the exporter itself. One has to extend this method: https://github.com/hikhvar/mqtt2prometheus/blob/master/pkg/metrics/ingest.go#L40 to not only count error and success, but also the message size