add custom user agent to HTTP monitors

agent/network_monitor_probe.go

@@ -8,9 +8,12 @@ import (
 	"net/http"
 	"time"
 
+	"github.com/henrygd/beszel"
 	"github.com/henrygd/beszel/internal/entities/monitor"
 )
 
+const networkMonitorUserAgent = "Beszel-Agent/" + beszel.Version + " (+https://beszel.dev)"
+
 // monitorProbe performs one check. Errors are recorded as loss by the task runner.
 // Implementations must honor cancellation and bound their execution time.
 type monitorProbe func(context.Context, monitor.Config) (int64, error)
@@ -93,6 +96,7 @@ func monitorHTTP(ctx context.Context, client *http.Client, url string) (int64, e
 	if err != nil {
 		return -1, err
 	}
+	req.Header.Set("User-Agent", networkMonitorUserAgent)
 	resp, err := client.Do(req)
 	if err != nil {
 		return -1, err

agent/network_monitor_test.go

@@ -10,6 +10,7 @@ import (
 	"testing"
 	"time"
 
+	"github.com/henrygd/beszel"
 	"github.com/henrygd/beszel/internal/entities/monitor"
 	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
@@ -240,6 +241,7 @@ func TestMonitorManagerGetRandomDelay(t *testing.T) {
 func TestMonitorHTTP(t *testing.T) {
 	t.Run("success", func(t *testing.T) {
 		server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+			assert.Equal(t, "Beszel-Agent/"+beszel.Version+" (+https://beszel.dev)", r.Header.Get("User-Agent"))
 			w.WriteHeader(http.StatusNoContent)
 		}))
 		defer server.Close()