Alert rule validation does not accept valid template {{ .Time.Local.Format "15:04:05 MST" }}

[eras]

Chronograf version: 1.10.0
Installation method: docker image chronograf:1.10 from docker hub
Related issues: #5090, #5137, #5343
Related PRs: #5516

This is a re-opening of #5343, which was reported by commit de96add in fixed in 1.8.5 through #5516.

Steps to reproduce:
List the minimal actions needed to reproduce the behavior.

1. In the Alert message template use

Doorbell  {{ .Time.Local.Format "15:04:05 MST" }}

Expected behavior:
I expect validation to pass.

Actual behavior:
Validation fails with message "Please correct templates in alert message."

Environment info:

• Chronograf version: 1.10.0

Other versions are probably not relevant, as the verification occurs without consulting external components in

chronograf/ui/src/kapacitor/utils/alertMessageValidation.ts

Line 63 in 406065e

export const isValidMessage = (message: string): boolean => {

Config:
Does not seem relevant. I can provide this if it is.

Logs:
No relevant log entries.