in_process_exporter_metrics: convert rss memory from pages to bytes

[Bedledl]

#9343

Enter [N/A] in the box, if an item is not applicable to your change.

Testing
Before we can approve your change; please submit the following in a comment:

• Example configuration file for the change
• Debug log output from testing the change

• Attached Valgrind output that shows no leaks or memory corruption was found

If this is a change to packaging of containers or native binaries then please confirm it works for all targets.

• [N/A] Run local packaging test showing all targets (including any new ones) build.
• [N/A] Set ok-package-test label to test for all targets (requires maintainer to do).

Documentation

• [N/A] Documentation required for this feature

Backporting

• Backport to latest stable release.

---

Fluent Bit is licensed under Apache 2.0, by submitting this pull request I understand that this code will be released under the terms of that license.

[Bedledl]

Example configuration: fluent-bit -i process_exporter_metrics -p metrics="memory" -o stdout

Output thats shows successful fix: process_memory_bytes{name="rsyslogd",pid="167",ppid="1",type="rss"} = 483328

cat /proc/167/status | grep Rss RssAnon: 472 kB RssFile: 0 kB RssShmem: 0 kB

[cosmo0920]

Basically, it works. I added a comment for the type of returning result of sysconf system call.

[cosmo0920]

Could you use signed-off in your commit?
We use DCO and it complains signed-off is missing:

Summary

Commit sha: 09989e7, Author: Bettina Riedl, Committer: Bettina Riedl; The sign-off is missing.

[Bedledl]

Could you use signed-off in your commit? We use DCO and it complains signed-off is missing:

Summary

Commit sha: 09989e7, Author: Bettina Riedl, Committer: Bettina Riedl; The sign-off is missing.

Added sign-off :)

[Bedledl]

Force push was rebase on current main