diff --git a/.github/workflows/check.yml b/.github/workflows/check.yml
index 400e09f..bc009d5 100644
--- a/.github/workflows/check.yml
+++ b/.github/workflows/check.yml
@@ -40,6 +40,13 @@ jobs:
           WiFiManager@2.0.16-rc.2
           Arduino_JSON@0.2.0
           U8g2@2.34.22
+      # In some cases, actions/checkout@v4 will check out a detached HEAD; for
+      # example, this happens on pull request events, where an hypothetical
+      # PR merge commit is checked out. This tends to confuse
+      # `arduino-cli lib install --git-url`, making it fail with errors such as:
+      #   Error installing Git Library: Library install failed: object not found
+      # Create and check out a dummy branch to work around this issue.
+      - run: git checkout -b check
       - run: bin/arduino-cli --verbose lib install --git-url .
         env:
           ARDUINO_LIBRARY_ENABLE_UNSAFE_INSTALL: "true"
diff --git a/examples/ONE/ONE.ino b/examples/ONE/ONE.ino
index 0de5a4c..eff2c19 100644
--- a/examples/ONE/ONE.ino
+++ b/examples/ONE/ONE.ino
@@ -1065,7 +1065,7 @@ void webServerMetricsGet(void) {
       add_metric("temperature",
                  "The ambient temperature as measured by the AirGradient SHT "
                  "sensor, in degrees Celsius",
-                 "gauge", "degc");
+                 "gauge", "celcius");
       add_metric_point("", String(temp));
     }
     if (hum >= 0) {
@@ -1100,17 +1100,11 @@ static void webServerInit(void) {
   // Make it possible to query this device from Prometheus/OpenMetrics.
   webServer.on("/metrics", HTTP_GET, webServerMetricsGet);
   webServer.begin();
-  MDNS.addService("http", "tcp", 80);
-  MDNS.addServiceTxt("http", "_tcp", "model", mdnsModelName);
-  MDNS.addServiceTxt("http", "_tcp", "serialno", getDevId());
-  MDNS.addServiceTxt("http", "_tcp", "fw_ver", ag.getVersion());
-  MDNS.addServiceTxt("http", "_tcp", "vendor", "AirGradient");
-  MDNS.addService("http", "tcp", 80);
-  MDNS.addService("_airgradient", "tcp", 80);
-  MDNS.addServiceTxt("airgradient", "_tcp", "model", mdnsModelName);
-  MDNS.addServiceTxt("airgradient", "_tcp", "serialno", getDevId());
-  MDNS.addServiceTxt("airgradient", "_tcp", "fw_ver", ag.getVersion());
-  MDNS.addServiceTxt("airgradient", "_tcp", "vendor", "AirGradient");
+  MDNS.addService("_airgradient", "_tcp", 80);
+  MDNS.addServiceTxt("_airgradient", "_tcp", "model", mdnsModelName);
+  MDNS.addServiceTxt("_airgradient", "_tcp", "serialno", getDevId());
+  MDNS.addServiceTxt("_airgradient", "_tcp", "fw_ver", ag.getVersion());
+  MDNS.addServiceTxt("_airgradient", "_tcp", "vendor", "AirGradient");
 
   if (xTaskCreate(webServerHandler, "webserver", 1024 * 4, NULL, 5, NULL) !=
       pdTRUE) {