Prometheus/Loki: Allow custom value in operation selects (#46679)

* Prometheus/Loki: Allow custom value in operation selects

* Add missing operator

public/app/plugins/datasource/prometheus/querybuilder/shared/LabelFilterItem.tsx

@@ -120,4 +120,5 @@ const operators = [
   { label: '=~', value: '=~' },
   { label: '=', value: '=' },
   { label: '!=', value: '!=' },
+  { label: '!~', value: '!~' },
 ];

public/app/plugins/datasource/prometheus/querybuilder/shared/OperationParamEditor.tsx

@@ -76,6 +76,7 @@ function SelectInputParamEditor({
       value={valueOption}
       options={selectOptions}
       placeholder={paramDef.placeholder}
+      allowCustomValue={true}
       onChange={(value) => onChange(index, value.value!)}
     />
   );