Fix histogram printing mistakes

packet-exchange/src/client.c

@@ -307,8 +307,8 @@ static void print_histograms() {
   if (tsn_task == SEND_PACKET_TASK) {
     printf("{\"measure_sets\": [{"
            "\"measure_type\": \"packet_send_timestamps\","
-           "\"props_names\": [\"user_space\", \"kernel_space\"],"
-           "\"units\": [\"us\", \"us\"],"
+           "\"props_names\": [\"kernel_space\"],"
+           "\"units\": [\"us\"],"
            "\"props_type\": \"histogram\","
            "\"metadata\": {\"i\": \"%dus\", \"duration\": \"%dh%d\", \"etf_offset\": \"%dus\",},"
            "\"props\": [[",

packet-exchange/src/server.c

@@ -274,7 +274,7 @@ static void print_histograms() {
            "\"props_names\": [\"kernel_space\"],"
            "\"units\": [\"us\"],"
            "\"props_type\": \"histogram\","
-           "\"metadata\": \"i\": \"%dus\", \"duration\": \"%dh%d\"},"
+           "\"metadata\": {\"i\": \"%dus\", \"duration\": \"%dh%d\"},"
            "\"props\": [[",
            interval, duration_hour, duration_minutes);
 
@@ -288,7 +288,7 @@ static void print_histograms() {
   max_jitter = histogram_max(jitter_hist, MAX_JITTER - 1);
   min_jitter = histogram_min(jitter_hist, MAX_JITTER - 1);
 
-  printf("%s", enable_timestamps ? "]}, {" : "{\"measure_sets\": [{");
+  printf("%s", enable_timestamps ? "}, {" : "{\"measure_sets\": [{");
 
   printf("\"measure_type\": \"packet_jitter\","
          "\"props_names\": [\"jitter\"],"