Process Exporter Metrics: RSS memory is probably falsely given in page count instead of bytes

[Bedledl]

Bug Report

In https://github.com/fluent/fluent-bit/blob/master/plugins/in_process_exporter_metrics/pe_process.c#L1105 the RSS memory that is scraped from /proc//stat is set as "memory_bytes".

if (pe_utils_str_to_uint64(tmp, &val) != -1) {
       cmt_gauge_set(ctx->memory_bytes, ts, val, 4, (char *[]){ name, pid_str, ppid_str, "rss" });
}

In https://man7.org/linux/man-pages/man5/proc_pid_stat.5.html it is though specified that the rss value is given in number of pages.

To Reproduce
Get memory metrics by fluent-bit -i process_exporter_metrics -p metrics="memory" -o stdout, e.g.
process_memory_bytes{name="rsyslogd",pid="167",ppid="1",type="rss"} = 118

Look at actual RSS values with cat /proc/167/status | grep Rss:

RssAnon:             472 kB
RssFile:               0 kB
RssShmem:              0 kB

Actual behaviour
process_memory_bytes{type="rss"} gives page count but metric name is memory bytes.

Expected behavior
The metric value of process_memory_bytes{type="rss"} should be set multiplied by the system's page size, in this case ~472 000.

Your Environment

• Version used: fluent-bit 3.1.4