'Select A field' option is not populating while creating a new alert

Hi, i am trying to create a Metric threshold alert for memory usages is > 90 %. No field is populating in 'Select A field'' option . When I trying to add the field 'system.memory.used.pct'. it's not accepting it. Surprisingly , few alert jobs are working for for some other host for same. field. Please help me to resolve this issue.

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