Use specified time range, default to class value (#80557)

public/app/plugins/datasource/prometheus/datasource.ts

@@ -706,10 +706,12 @@ export class PrometheusDatasource
     const expr = promQueryModeller.renderLabels(labelFilters);
 
     if (this.hasLabelsMatchAPISupport()) {
-      return (await this.languageProvider.fetchSeriesValuesWithMatch(options.key, expr)).map((v) => ({
-        value: v,
-        text: v,
-      }));
+      return (await this.languageProvider.fetchSeriesValuesWithMatch(options.key, expr, options.timeRange)).map(
+        (v) => ({
+          value: v,
+          text: v,
+        })
+      );
     }
 
     const params = this.getTimeRangeParams(options.timeRange ?? getDefaultTimeRange());

public/app/plugins/datasource/prometheus/language_provider.ts

@@ -239,11 +239,16 @@ export default class PromQlLanguageProvider extends LanguageProvider {
    * Fetches all values for a label, with optional match[]
    * @param name
    * @param match
+   * @param timeRange
    */
-  fetchSeriesValuesWithMatch = async (name: string, match?: string): Promise<string[]> => {
+  fetchSeriesValuesWithMatch = async (
+    name: string,
+    match?: string,
+    timeRange: TimeRange = this.timeRange
+  ): Promise<string[]> => {
     const interpolatedName = name ? this.datasource.interpolateString(name) : null;
     const interpolatedMatch = match ? this.datasource.interpolateString(match) : null;
-    const range = this.datasource.getAdjustedInterval(this.timeRange);
+    const range = this.datasource.getAdjustedInterval(timeRange);
     const urlParams = {
       ...range,
       ...(interpolatedMatch && { 'match[]': interpolatedMatch }),