fix(runner/loki): send basic auth on the compat query path

charts/nudgebee-agent/values.yaml

@@ -65,7 +65,7 @@ runnerServiceAccount:
 runner:
   image:
     repository: ghcr.io/nudgebee/nudgebee-agent
-    tag: 2026-07-14T03-38-04_fbc9436d684526a0b45488ac510a33e5168b5ae7
+    tag: 2026-07-14T09-20-14_17a3cbad58bd80c14dee85a158cc4ec2de19e09f
   # Image template the pod_profiler action launches debugger pods from.
   # The agent substitutes `{}` for the variant (bpf, jvm, python, perf, ruby).
   # Surfaces as PROFILER_IMAGE; leave empty to fall back to the binary default.

runner/pkg/enrichers/loki.go

@@ -117,6 +117,12 @@ func (l *LokiCompat) rawGet(ctx context.Context, path string) ([]byte, error) {
 	if err != nil {
 		return nil, err
 	}
+	// LOKI_USERNAME/LOKI_PASSWORD → Basic-Auth, mirroring the primitive
+	// loki.Client.get (client.go). The compat path was dropping these,
+	// causing 401s on any basic-auth Loki.
+	if l.c.Username != "" && l.c.Password != "" {
+		req.SetBasicAuth(l.c.Username, l.c.Password)
+	}
 	for k, vv := range l.c.ExtraHeaders {
 		for _, v := range vv {
 			req.Header.Add(k, v)

runner/pkg/enrichers/loki_test.go

@@ -0,0 +1,63 @@
+package enrichers
+
+import (
+	"context"
+	"net/http"
+	"net/http/httptest"
+	"testing"
+	"time"
+
+	"github.com/nudgebee/nudgebee-agent/pkg/observability/loki"
+)
+
+// TestLokiCompat_SendsBasicAuth verifies the compat handlers apply
+// LOKI_USERNAME/LOKI_PASSWORD basic auth, matching the primitive
+// loki.Client path. Regression guard for the 401-on-basic-auth-Loki bug.
+func TestLokiCompat_SendsBasicAuth(t *testing.T) {
+	var gotUser, gotPass string
+	var gotOK bool
+	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		gotUser, gotPass, gotOK = r.BasicAuth()
+		_, _ = w.Write([]byte(`{"status":"success"}`))
+	}))
+	defer srv.Close()
+
+	lc := loki.New(srv.URL, &http.Client{Timeout: 5 * time.Second})
+	lc.Username = "loki-user"
+	lc.Password = "loki-pass"
+	compat := NewLokiCompat(lc)
+
+	h := compat.Handlers()["query_loki"]
+	if _, err := h(context.Background(), map[string]any{"query": "query={foo=\"bar\"}"}); err != nil {
+		t.Fatal(err)
+	}
+	if !gotOK {
+		t.Fatal("no basic auth header reached upstream")
+	}
+	if gotUser != "loki-user" || gotPass != "loki-pass" {
+		t.Errorf("basic auth = %q/%q; want loki-user/loki-pass", gotUser, gotPass)
+	}
+}
+
+// TestLokiCompat_NoAuthWhenUnset confirms we don't send basic auth when
+// username/password aren't configured (only one set counts as unset).
+func TestLokiCompat_NoAuthWhenUnset(t *testing.T) {
+	var sawAuth bool
+	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		_, _, sawAuth = r.BasicAuth()
+		_, _ = w.Write([]byte(`{}`))
+	}))
+	defer srv.Close()
+
+	lc := loki.New(srv.URL, &http.Client{Timeout: 5 * time.Second})
+	lc.Username = "only-user" // password empty → must not send basic auth
+	compat := NewLokiCompat(lc)
+
+	h := compat.Handlers()["query_loki"]
+	if _, err := h(context.Background(), map[string]any{"query": "query=x"}); err != nil {
+		t.Fatal(err)
+	}
+	if sawAuth {
+		t.Error("basic auth sent even though password is empty")
+	}
+}