Ttyler 2022 08 shellcheck#28

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cttyler wants to merge 9 commits intomasterfrom

ttyler-2022-08-shellcheck

Commits on Aug 6, 2022

chmod +x; no code change.
cttyler
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Commits on Aug 7, 2022

ShellCheck for monitor_metrics.sh, functionally similar with optimizations and bug fixes.
cttyler
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ShellCheck for push_metrics.sh, and standardized usage() calls & behavior for {push,monitor}_metrics.sh.
cttyler
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ShellCheck for check_for_updates.sh; standardized usage() calls, fixed usage bug, improved error message.
cttyler
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ShellCheck for install_{p4prom,prom_graf}.sh, and standardized usage() calls, fixed bug.
cttyler
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ShellCheck for monitor_metrics_wrapper.sh, and standardized usage() calls, fixed bug.
cttyler
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ShellCheck for update_p4prom.sh, and standardized usage() calls, fixed bug.
cttyler
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ShellCheck for upload_grafana_dashboard.sh.
cttyler
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Commits on Sep 1, 2022

Fixed issue with missing redirect operator.
cttyler
committed