fix: Keep the service_name label after discovery in push.ParseLokiRequest before calculating retention and passing to the usage tracker (#14960)

Signed-off-by: Jordan Rushing <rushing.jordan@gmail.com>

Author: JordanRushing

pkg/loghttp/push/push.go

@@ -264,9 +264,6 @@ func ParseLokiRequest(userID string, r *http.Request, tenantsRetention TenantsRe
 			lb := labels.NewBuilder(lbs)
 			lbs = lb.Set(LabelServiceName, serviceName).Labels()
 			s.Labels = lbs.String()
-
-			// Remove the added label after it's added to the stream so it's not consumed by subsequent steps
-			lbs = lb.Del(LabelServiceName).Labels()
 		}
 
 		if logPushRequestStreams {

pkg/loghttp/push/push_test.go

@@ -221,7 +221,7 @@ func TestParseRequest(t *testing.T) {
 			enableServiceDiscovery:    true,
 			expectedBytes:             len("fizzbuzz"),
 			expectedLines:             1,
-			expectedBytesUsageTracker: map[string]float64{`{foo="bar2", job="stuff"}`: float64(len("fizzbuss"))},
+			expectedBytesUsageTracker: map[string]float64{`{foo="bar2", job="stuff", service_name="stuff"}`: float64(len("fizzbuss"))},
 			expectedLabels:            labels.FromStrings("foo", "bar2", "job", "stuff", LabelServiceName, "stuff"),
 		},
 		{
@@ -232,7 +232,7 @@ func TestParseRequest(t *testing.T) {
 			enableServiceDiscovery:    true,
 			expectedBytes:             len("fizzbuzz"),
 			expectedLines:             1,
-			expectedBytesUsageTracker: map[string]float64{`{foo="bar2"}`: float64(len("fizzbuss"))},
+			expectedBytesUsageTracker: map[string]float64{`{foo="bar2", service_name="unknown_service"}`: float64(len("fizzbuss"))},
 			expectedLabels:            labels.FromStrings("foo", "bar2", LabelServiceName, ServiceUnknown),
 		},
 		{