sql: add schema_name to index usage stat telemetry

This commit adds the schema name to the index usage statistics
telemetry.

Fixes cockroachdb#85932.

Release justification: low risk, high benefit changes to existing functionality
Release note (sql change): Added the schema name to index usage statistics
telemetry.

docs/generated/eventlog.md

@@ -2380,7 +2380,11 @@ An event of type `captured_index_usage_stats`
 | `IsUnique` | IsUnique indicates if the index has a UNIQUE constraint. | no |
 | `IsInverted` | IsInverted indicates if the index is an inverted index. | no |
 | `CreatedAt` | CreatedAt is the timestamp at which the index was created. | no |
+<<<<<<< HEAD
 >>>>>>> b224354ea1 (sql: add descriptions to idx usage telemetry fields)
+=======
+| `SchemaName` | SchemaName is the name of the schema in which the index was created. | no |
+>>>>>>> d6dfdede40 (sql: add schema_name to index usage stat telemetry)
 
 
 #### Common fields

pkg/sql/scheduledlogging/captured_index_usage_stats.go

@@ -170,7 +170,7 @@ func captureIndexUsageStats(
 
 	// Capture index usage statistics for each database.
 	var ok bool
-	expectedNumDatums := 9
+	expectedNumDatums := 11
 	var allCapturedIndexUsageStats []eventpb.EventPayload
 	for _, databaseName := range allDatabaseNames {
 		// Omit index usage statistics on the default databases 'system',
@@ -188,13 +188,17 @@ func captureIndexUsageStats(
 		 ti.is_unique,
 		 ti.is_inverted,
 		 total_reads,
-		 last_read
+		 last_read,
+		 ti.created_at,
+     t.schema_name
 		FROM %s.crdb_internal.index_usage_statistics AS us
 		JOIN %s.crdb_internal.table_indexes ti
 		ON us.index_id = ti.index_id
 		 AND us.table_id = ti.descriptor_id
+    JOIN %s.crdb_internal.tables t 
+    ON ti.descriptor_id = t.table_id
 		ORDER BY total_reads ASC;
-	`, databaseName, databaseName)
+	`, databaseName, databaseName, databaseName)
 
 		it, err := ie.QueryIteratorEx(
 			ctx,
@@ -232,6 +236,11 @@ func captureIndexUsageStats(
 			if row[8] != tree.DNull {
 				lastRead = tree.MustBeDTimestampTZ(row[8]).Time
 			}
+			createdAt := time.Time{}
+			if row[9] != tree.DNull {
+				createdAt = tree.MustBeDTimestamp(row[9]).Time
+			}
+			schemaName := tree.MustBeDString(row[10])
 
 			capturedIndexStats := &eventpb.CapturedIndexUsageStats{
 				TableID:        uint32(roachpb.TableID(tableID)),
@@ -244,6 +253,8 @@ func captureIndexUsageStats(
 				IndexType:      string(indexType),
 				IsUnique:       bool(isUnique),
 				IsInverted:     bool(isInverted),
+				CreatedAt:      createdAt.String(),
+				SchemaName:     string(schemaName),
 			}
 
 			allCapturedIndexUsageStats = append(allCapturedIndexUsageStats, capturedIndexStats)

pkg/util/log/eventpb/telemetry.proto

@@ -177,6 +177,9 @@ message CapturedIndexUsageStats {
 
   // CreatedAt is the timestamp at which the index was created.
   string created_at = 12 [(gogoproto.jsontag) = ",omitempty", (gogoproto.moretags) = "redact:\"nonsensitive\""];
+
+  // SchemaName is the name of the schema in which the index was created.
+  string schema_name = 13 [(gogoproto.jsontag) = ",omitempty", (gogoproto.moretags) = "redact:\"nonsensitive\""];
 }
 
 // CreateChangefeed is an event for any CREATE CHANGEFEED query that