[pkg/ottl] Add IsNaN Converter

[bryan-aguilar]

Component(s)

pkg/ottl

Is your feature request related to a problem? Please describe.

OTTL has no way to check if a double value is NaN. https://pkg.go.dev/math#IsNaN

Describe the solution you'd like

Add a new Converter, IsNaN that returns true if the given value is NaN. It should return false if the value is not a double.

The implementing PR should

• Implement the function
• Add new unit tests for the function
• Add the function to pkg/ottl/ottlfuncs/functions.go
• Update the README at pkg/ottl/ottlfuncs/README.md

Describe alternatives you've considered

No response

Additional context

No response

[github-actions]

Pinging code owners:

• pkg/ottl: @TylerHelmuth @kentquirk @bogdandrutu @evan-bradley

See Adding Labels via Comments if you do not have permissions to add labels yourself.

[sethallen]

I will work on this one! (Contribfest)

[github-actions]

This issue has been inactive for 60 days. It will be closed in 60 days if there is no activity. To ping code owners by adding a component label, see Adding Labels via Comments, or if you are unsure of which component this issue relates to, please ping @open-telemetry/collector-contrib-triagers. If this issue is still relevant, please ping the code owners or leave a comment explaining why it is still relevant. Otherwise, please close it.

Pinging code owners:

• pkg/ottl: @TylerHelmuth @kentquirk @bogdandrutu @evan-bradley

See Adding Labels via Comments if you do not have permissions to add labels yourself.

[TylerHelmuth]

@bryan-aguilar can you remind me of the situation you experienced that requires this function?

[TylerHelmuth]

Closing for now. If anyone can come up with a way to produce NaN that would need checked please comment.