Update cheatsheets

gnomon

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# gnomon
+
+> Utility to annotate console logging statements with timestamps and find slow processes.
+> More information: <https://github.com/paypal/gnomon>.
+
+- Use UNIX (or DOS) pipes to pipe `stdout` of any command through gnomon:
+
+`{{npm test}} | gnomon`
+
+- Show number of seconds since the start of the process:
+
+`{{npm test}} | gnomon --type=elapsed-total`
+
+- Show an absolute timestamp in UTC:
+
+`{{npm test}} | gnomon --type=absolute`
+
+- Use a high threshold of 0.5 seconds, exceeding which the timestamp will be colored bright red:
+
+`{{npm test}} | gnomon --high 0.5`
+
+- Use a medium threshold of 0.2 seconds, exceeding which the timestamp will be colored bright yellow:
+
+`{{npm test}} | gnomon --medium {{0.2}}`