filter {
  childFilter {
    childFilter {
      lhs {
        columnIdentifier {
          columnName: "BACKEND.startTime"
        }
      }
      operator: GE
      rhs {
        literal {
          value {
            valueType: LONG
            long: 1631177908474
          }
        }
      }
    }
    childFilter {
      lhs {
        columnIdentifier {
          columnName: "BACKEND.startTime"
        }
      }
      operator: LT
      rhs {
        literal {
          value {
            valueType: LONG
            long: 1631181508474
          }
        }
      }
    }
  }
}
selection {
  columnIdentifier {
    columnName: "BACKEND.id"
  }
}
selection {
  function {
    functionName: "SUM"
    arguments {
      columnIdentifier {
        columnName: "BACKEND.errorCount"
      }
    }
    alias: "SUM_BACKEND.errorCount_[]"
  }
}
selection {
  function {
    functionName: "SUM"
    arguments {
      columnIdentifier {
        columnName: "BACKEND.numCalls"
      }
    }
    alias: "SUM_BACKEND.numCalls_[]"
  }
}
groupBy {
  columnIdentifier {
    columnName: "BACKEND.id"
  }
}
limit: 10000

sum by (backend_id) 
(sum_over_time(num_calls{tenant_id="__default"}[3600000ms])) 
@ 1631181508474

sum by (backend_id) 
(sum_over_time(error_count{tenant_id="__default"'}[3600000ms])) 
@ 1631181508474