server: add internal_app_name_prefix to ListSessionsResponse

Previously, the InternalAppNamePrefix constant from catconstants was
only included in the Statements Response. This change adds that same
field to the ListSessionsResponse.

Release note: none

pkg/server/serverpb/status.proto

@@ -818,6 +818,9 @@ message ListSessionsResponse {
   repeated Session sessions = 1 [ (gogoproto.nullable) = false ];
   // Any errors that occurred during fan-out calls to other nodes.
   repeated ListSessionsError errors = 2 [ (gogoproto.nullable) = false ];
+  // If set and non-empty, indicates the prefix to application_name
+  // used for statements/queries issued internally by CockroachDB.
+  string internal_app_name_prefix = 4;
 }
 
 // Request object for issuing a query cancel request.

pkg/server/status.go

@@ -52,6 +52,7 @@ import (
 	"github.com/cockroachdb/cockroach/pkg/server/telemetry"
 	"github.com/cockroachdb/cockroach/pkg/settings/cluster"
 	"github.com/cockroachdb/cockroach/pkg/sql"
+	"github.com/cockroachdb/cockroach/pkg/sql/catalog/catconstants"
 	"github.com/cockroachdb/cockroach/pkg/sql/contention"
 	"github.com/cockroachdb/cockroach/pkg/sql/flowinfra"
 	"github.com/cockroachdb/cockroach/pkg/sql/roleoption"
@@ -2292,8 +2293,9 @@ func (s *statusServer) listSessionsHelper(
 	ctx context.Context, req *serverpb.ListSessionsRequest, limit int, start paginationState,
 ) (*serverpb.ListSessionsResponse, paginationState, error) {
 	response := &serverpb.ListSessionsResponse{
-		Sessions: make([]serverpb.Session, 0),
-		Errors:   make([]serverpb.ListSessionsError, 0),
+		Sessions:              make([]serverpb.Session, 0),
+		Errors:                make([]serverpb.ListSessionsError, 0),
+		InternalAppNamePrefix: catconstants.InternalAppNamePrefix,
 	}
 
 	dialFn := func(ctx context.Context, nodeID roachpb.NodeID) (interface{}, error) {