diff --git a/src/routes/api/telemetry/+server.ts b/src/routes/api/telemetry/+server.ts
index 75434fa..1223c7a 100644
--- a/src/routes/api/telemetry/+server.ts
+++ b/src/routes/api/telemetry/+server.ts
@@ -4,7 +4,9 @@ import { saveTelemetry } from '$lib/server/fleet/telemetry.js';
 import { emit } from '$lib/server/pipeline/bus.js';
 
 export async function POST({ request }: { request: Request }) {
+    console.log('[telemetry] received POST /api/telemetry');
     if (request.headers.get('content-type')?.split(';')[0].trim().toLowerCase() !== 'application/json') {
+        console.log('[telemetry] rejected 415: Content-Type must be application/json');
         return json({ ok: false, error: 'Content-Type must be application/json' }, { status: 415 });
     }
     const body = await request.json().catch(() => null);
@@ -13,10 +15,12 @@ export async function POST({ request }: { request: Request }) {
         || typeof body.server !== 'string' || !body.server.length || body.server.length > 255
         || !Number.isSafeInteger(body.round) || body.round < 0
         || !Number.isSafeInteger(body.players) || body.players < 0) {
+        console.log('[telemetry] rejected 400: invalid round_change payload or malformed JSON');
         return json({ ok: false, error: 'Expected round_change, a server name, and nonnegative integer round and players' }, { status: 400 });
     }
     const server = getServer(body.server);
     if (!server || server.destroyed_at) {
+        console.log(`[telemetry] rejected 404: unknown or destroyed server ${JSON.stringify(body.server)}`);
         return json({ ok: false, error: 'Unknown or destroyed server' }, { status: 404 });
     }
     const telemetry = {
@@ -24,6 +28,7 @@ export async function POST({ request }: { request: Request }) {
         players: body.players as number, receivedAt: new Date().toISOString()
     };
     saveTelemetry(telemetry);
+    console.log(`[telemetry] accepted round_change ${JSON.stringify(telemetry)}`);
     emit({ type: 'server-telemetry', entries: [telemetry] });
     return json({ ok: true, telemetry });
 }