node_exporter_metrics: Align the collecting metrics of unit statuses

[cosmo0920]

In the original node_exporter, it only uses 0 or 1 which means that this status is active or not.
To represent this specification on Fluent Bit, we need to fill as 0 at first. Then, we need filling with 1 for the active statuses.

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

• Example configuration file for the change

$bin/fluent-bit -i node_exporter_metrics -o stdout -v

• Debug log output from testing the change

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

==3791369== 
==3791369== HEAP SUMMARY:
==3791369==     in use at exit: 0 bytes in 0 blocks
==3791369==   total heap usage: 228,729 allocs, 228,729 frees, 13,302,851,339 bytes allocated
==3791369== 
==3791369== All heap blocks were freed -- no leaks are possible
==3791369== 
==3791369== For lists of detected and suppressed errors, rerun with: -s
==3791369== ERROR SUMMARY: 0 errors from 0 contexts (suppressed: 0 from 0)

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

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Backporting

• Backport to latest stable release.

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[edsiper]

adding @pwhelan for review

[edsiper]

@cosmo0920 what's the main difference with the implementation proposed on #9136 ?

[cosmo0920]

@cosmo0920 what's the main difference with the implementation proposed on #9136 ?

The main difference is: This PR will set all of 0 value at first. And set 1 only for an active state.
The #9136 will set 1 for an active state and other state will be set as 0.

[pwhelan]

I had not seen originally that this one set the states, since it does just merge this one.

I had my PR from before just had not pushed it.

[edsiper]

thanks both

[edsiper]

@cosmo0920 note: in_node_exporter_metrics: ...