fix: preserve order of node reports in healthcheck (#10835)

coderd/healthcheck/derphealth/derp.go

@@ -11,6 +11,7 @@ import (
 	"sync/atomic"
 	"time"
 
+	"golang.org/x/exp/slices"
 	"golang.org/x/xerrors"
 	"tailscale.com/derp"
 	"tailscale.com/derp/derphttp"
@@ -22,6 +23,7 @@ import (
 	tslogger "tailscale.com/types/logger"
 
 	"github.com/coder/coder/v2/coderd/util/ptr"
+	"github.com/coder/coder/v2/coderd/util/slice"
 )
 
 const (
@@ -183,6 +185,11 @@ func (r *RegionReport) Run(ctx context.Context) {
 	}
 	wg.Wait()
 
+	r.mu.Lock()
+	defer r.mu.Unlock()
+
+	sortNodeReports(r.NodeReports)
+
 	// Coder allows for 1 unhealthy node in the region, unless there is only 1 node.
 	if len(r.Region.Nodes) == 1 {
 		r.Healthy = healthyNodes == len(r.Region.Nodes)
@@ -492,3 +499,9 @@ func convertError(err error) *string {
 
 	return nil
 }
+
+func sortNodeReports(reports []*NodeReport) {
+	slices.SortFunc(reports, func(a, b *NodeReport) int {
+		return slice.Ascending(a.Node.Name, b.Node.Name)
+	})
+}

coderd/healthcheck/derphealth/derp_test.go

@@ -83,7 +83,6 @@ func TestDERP(t *testing.T) {
 
 	t.Run("HealthyWithNodeDegraded", func(t *testing.T) {
 		t.Parallel()
-		t.Skip("https://github.com/coder/coder/issues/10824")
 
 		healthyDerpSrv := derp.NewServer(key.NewNode(), func(format string, args ...any) { t.Logf(format, args...) })
 		defer healthyDerpSrv.Close()