chore(gatsby): count sift hits in telemetry (#23416)

* chore(gatsby): count sift hits in telemetry

We want to know how frequent the fast indexes fail to find anything when they're actually supposed to find something. This is currently not tracked and leads to skewed results. By counting how frequent Sift finds something when fast indexes fail or bail, we can get more relevant insight into how well fast indexes are actually performing, and/or whether we need to start thinking about eliminating Sift altogether. tbd.

* Inverse if-order

packages/gatsby/src/query/graphql-runner.ts

@@ -28,6 +28,7 @@ interface IGraphQLRunnerStats {
   totalRunQuery: number
   totalPluralRunQuery: number
   totalIndexHits: number
+  totalSiftHits: number
   totalNonSingleFilters: number
   comparatorsUsed: Map<string, number>
   uniqueFilterPaths: Set<string>
@@ -41,6 +42,7 @@ interface IGraphQLRunnerStatResults {
   totalRunQuery: number
   totalPluralRunQuery: number
   totalIndexHits: number
+  totalSiftHits: number
   totalNonSingleFilters: number
   comparatorsUsed: Array<{ comparator: string; amount: number }>
   uniqueFilterPaths: number
@@ -89,6 +91,7 @@ export default class GraphQLRunner {
         totalRunQuery: 0,
         totalPluralRunQuery: 0,
         totalIndexHits: 0,
+        totalSiftHits: 0,
         totalNonSingleFilters: 0,
         comparatorsUsed: new Map(),
         uniqueFilterPaths: new Set(),
@@ -141,6 +144,7 @@ export default class GraphQLRunner {
         totalRunQuery: this.stats.totalRunQuery,
         totalPluralRunQuery: this.stats.totalPluralRunQuery,
         totalIndexHits: this.stats.totalIndexHits,
+        totalSiftHits: this.stats.totalSiftHits,
         totalNonSingleFilters: this.stats.totalNonSingleFilters,
         comparatorsUsed: comparatorsUsedObj,
         uniqueFilterPaths: this.stats.uniqueFilterPaths.size,

packages/gatsby/src/redux/run-sift.js

@@ -451,7 +451,20 @@ const applyFilters = (
     return result
   }
 
-  return filterWithSift(filters, firstOnly, nodeTypeNames, resolvedFields)
+  const siftResult = filterWithSift(
+    filters,
+    firstOnly,
+    nodeTypeNames,
+    resolvedFields
+  )
+
+  if (stats) {
+    if (!siftResult || siftResult.length === 0) {
+      stats.totalSiftHits++
+    }
+  }
+
+  return siftResult
 }
 
 const filterToStats = (