Add name and description for metrics

Sources/App/Management/SQLiteDatabase.swift

@@ -52,7 +52,10 @@ final class SQLiteDatabase {
     private let registeredPlayerCountMetric: Metric<Int>
 
     init(database: Database, mail: Configuration.EMail?) {
-        self.registeredPlayerCountMetric = Metric("schafkopf.players")
+        self.registeredPlayerCountMetric = Metric(
+            "schafkopf.players",
+            name: "Number of users",
+            description: "The total number of user accounts")
         self.tables = TableManagement(database: database)
         self.mail = mail?.mailConfig
 

Sources/App/Management/TableManagement.swift

@@ -28,9 +28,18 @@ final class TableManagement {
      - Throws: Errors when the file could not be read
      */
     init(database: Database) {
-        self.tableCountMetric = .init("schafkopf.tables")
-        self.playingPlayerCountMetric = .init("schafkopf.playing")
-        self.connectedPlayerCountMetric = .init("schafkopf.connected")
+        self.tableCountMetric = .init(
+            "schafkopf.tables",
+            name: "Open tables",
+            description: "The number of currently available tables")
+        self.playingPlayerCountMetric = .init(
+            "schafkopf.playing",
+            name: "Sitting players",
+            description: "The number of players currently sitting at a table")
+        self.connectedPlayerCountMetric = .init(
+            "schafkopf.connected",
+            name: "Connected players",
+            description: "The number of players with a websocket connection to the server")
 
         Task {
             do {