[whaaaaat]

The reverse is also true though -- hearing from folks that we need to measure nothing because "trust me". Both lead to poor outcomes, ime.

A good engineering team has measurements in place that are reasonable approximations, where it is reasonable to build them, but also treats them as prompts rather than absolutes. Asking "why is this metric out of band?" is infinitely more valuable than stating "this metric is out of band, we've failed".

[whatshisface]

Out of band means communicated on different channels than ordinary information. For example a metric communicated out of band would be told to you in person instead of showing up on your universal agent smith react widget dashboard. :-)

[shermantanktop]

Two different jargon phrases overlapping here, as I’m sure you know. Yours is “out of communication band” whereas GP is “out of predictive band.” Yours is a bit more common to me, but I hear both.

[eecc]

The latter should be “out of scale” (think 3.6 Roentgen…) “out of band” is quite literally outside the prescribed channel.

[whaaaaat]

A band, on a metric, indicates a minimum and maximum safe value. For instance, if you alarmed when your latency is below 50ms or above 150ms, that'd be your band. Being out of band is being out of that 'safe' window.

It's a totally valid and common jargon phrase from the web services world, apologies though, I assumed that it was wider jargon than it turns out it is...

[magicalhippo]

And the band could be the expected value range, as is commonly shown on many gauges by having a section colored.

[nmstoker]

There's no language rule that a phrase can have only one meaning. You seem to be taking this too precisely, as the earlier explanations of there being two interpretations are quite entirely reasonable.