Errata

This is perhaps a debatable quibble, but the text says, "Remember, it's not ready for production until it's monitored." That was a bit distracting, as there'd been no prior statement to that effect.

Perhaps a prior edit did, or perhaps the author felt it to be a common understanding. Given the introductory perspective of this first chapter, it's indeed a worthy assertion, so perhaps better wording might be "consider that" rather than "remember [that]". :-)

"TSDB" is not defined until pg 19 but it would be better to define on first use

"KPIs" is used but not defined until the next section. Not a big deal, but better to define on first use.

your apps have a ton of valuable information about their performance, many of which

'many' refers to the valuable information, not to your apps; it should probably be 'much'

which I covered xref.

I am pretty sure 'xref' is supposed to be a reference to another part of the book

strategies for fixing them, but \ the first

I think the backslash should be removed.

I also noticed the existing unconfirmed errata for 100 extra "\" and 110 extra "=" markup.

magic - if: if run-backup.sh fails

not clear why two ifs. this is minor, but reads more smoothly if 'if:' is removed

Why the standard OS metrics aren't as usual for alerts as you might think

'usual' should probably be 'useful'

world such as =collectd=, but

collectd is in the appropriate font, but I think the equals signs should be omitted.

that all nodes are both updating regularly and scans are both starting and finishing

I think the first 'both' should be dropped.

a component direct hooks

should add the word 'with' before 'direct'