[v9.5.x] Service graph: Fix error when service graph metrics are aggregated (#68691)

Service graph: Fix error when service graph metrics are aggregated (#68613)

make service graph work with aggregated metrics

(cherry picked from commit e1c2eb8c10)

Co-authored-by: Domas <domasx2@gmail.com>

public/app/plugins/datasource/tempo/datasource.ts

@@ -744,7 +744,7 @@ function makePromServiceMapRequest(options: DataQueryRequest<TempoQuery>): DataQ
         refId: metric,
         // options.targets[0] is not correct here, but not sure what should happen if you have multiple queries for
         // service map at the same time anyway
-        expr: `rate(${metric}${options.targets[0].serviceMapQuery || ''}[$__range])`,
+        expr: `sum by (client, server) (rate(${metric}${options.targets[0].serviceMapQuery || ''}[$__range]))`,
         instant: true,
       };
     }),