Prometheus: Do not show rate hint when increase function is applied (#21955)

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

@@ -75,6 +75,19 @@ describe('getQueryHints()', () => {
     expect(hints).toEqual(null);
   });
 
+  it('returns no rate hint for a counter metric that already has an increase', () => {
+    const series = [
+      {
+        datapoints: [
+          [23, 1000],
+          [24, 1001],
+        ],
+      },
+    ];
+    const hints = getQueryHints('increase(metric_total[1m])', series);
+    expect(hints).toEqual(null);
+  });
+
   it('returns a rate hint w/o action for a complex counter metric', () => {
     const series = [
       {

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

@@ -28,7 +28,7 @@ export function getQueryHints(query: string, series?: any[], datasource?: Promet
   }
 
   // Check for need of rate()
-  if (query.indexOf('rate(') === -1) {
+  if (query.indexOf('rate(') === -1 && query.indexOf('increase(') === -1) {
     // Use metric metadata for exact types
     const nameMatch = query.match(/\b(\w+_(total|sum|count))\b/);
     let counterNameMetric = nameMatch ? nameMatch[1] : '';