Monitor NGINX logs for critical & error messages after NGINX reload

[aphralG]

Proposed changes

Monitor NGINX logs for critical & error after an NGINX reload

Checklist

Before creating a PR, run through this checklist and mark each as complete.

• I have read the CONTRIBUTING document
• I have run make install-tools and have attached any dependency changes to this pull request
• If applicable, I have added tests that prove my fix is effective or that my feature works
• If applicable, I have checked that any relevant tests pass after adding my changes
• If applicable, I have updated any relevant documentation (README.md)
• If applicable, I have tested my cross-platform changes on Ubuntu 22, Redhat 8, SUSE 15 and FreeBSD 13

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[codecov-commenter]

Codecov Report

Patch coverage: 84.00% and project coverage change: +0.29 🎉

Comparison is base (0e16af7) 67.26% compared to head (2ec0afa) 67.56%.

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Additional details and impacted files

@@            Coverage Diff             @@
##             main     #385      +/-   ##
==========================================
+ Coverage   67.26%   67.56%   +0.29%     
==========================================
  Files         113      113              
  Lines       12743    12695      -48     
==========================================
+ Hits         8572     8577       +5     
+ Misses       3601     3550      -51     
+ Partials      570      568       -2     

Impacted Files	Coverage Δ
src/core/message.go	100.00% <ø> (ø)
src/core/network/network.go	31.48% <ø> (+0.21%)	⬆️
src/core/os.go	42.85% <0.00%> (ø)
...ed-metrics/tables/priority_table/priority_table.go	77.27% <ø> (+4.54%)	⬆️
...b.com/nginx/agent/v2/src/core/metrics/aggregate.go	88.29% <ø> (-0.25%)	⬇️
.../agent/v2/src/core/metrics/collectors/container.go	90.69% <ø> (ø)
...inx/agent/v2/src/core/metrics/collectors/system.go	92.85% <ø> (+5.35%)	⬆️
...t/v2/src/core/metrics/sources/cgroup/cgroup_cpu.go	83.87% <ø> (-0.13%)	⬇️
...com/nginx/agent/v2/src/core/metrics/sources/cpu.go	76.31% <ø> (-0.61%)	⬇️
...om/nginx/agent/v2/src/core/metrics/sources/disk.go	69.56% <ø> (-1.27%)	⬇️
... and 31 more

... and 5 files with indirect coverage changes

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