Add Metrics tab with historical server utilization and map capacity

src/lib/server/integrations/rcon.ts

@@ -310,6 +310,7 @@ export async function rconGetPlayerCount(server: string): Promise<number | null>
 
 export interface RconStatus {
     players: number;
+    capacity?: number | null;
     map: string | null;
     gametype: string | null;
     roster: RconPlayer[];
@@ -437,6 +438,7 @@ export async function rconStatusResult(server: string): Promise<RconStatusResult
             // Prefer statusResponse `\info\` line values when present, fall
             // back to print-body `key: value` header lines otherwise.
             players,
+            capacity: positiveCapacity(info.sv_maxclients ?? info.sv_maxClients ?? header.sv_maxclients ?? header.sv_maxClients),
             map: info.mapname ?? info.sv_mapname ?? header.map ?? header.mapname ?? header.sv_mapname ?? null,
             gametype: info.g_gametype ?? header.g_gametype ?? header.gametype ?? null,
             roster: parsePlayerRoster(text)
@@ -444,3 +446,8 @@ export async function rconStatusResult(server: string): Promise<RconStatusResult
         rawReply: formatRawReply(send.buf)
     };
 }
+
+function positiveCapacity(value: string | undefined): number | null {
+    const count = Number(value);
+    return Number.isInteger(count) && count > 0 ? count : null;
+}