diff --git a/packages/backend/scripts/check_connect.js b/packages/backend/scripts/check_connect.js
index 5d6d2fca49..edfcce00b0 100644
--- a/packages/backend/scripts/check_connect.js
+++ b/packages/backend/scripts/check_connect.js
@@ -7,11 +7,6 @@ import Redis from 'ioredis';
 import { loadConfig } from '../built/config.js';
 import { createPostgresDataSource } from '../built/postgres.js';
 
-const timeout = setTimeout(() => {
-	console.error('Timeout while connecting to databases.');
-	process.exit(1);
-}, 120000);
-
 const config = loadConfig();
 
 async function connectToPostgres() {
@@ -59,5 +54,3 @@ const promises = Array
 	]);
 
 await Promise.allSettled(promises);
-
-clearTimeout(timeout);
diff --git a/packages/backend/src/boot/master.ts b/packages/backend/src/boot/master.ts
index 551ff984b1..407694792a 100644
--- a/packages/backend/src/boot/master.ts
+++ b/packages/backend/src/boot/master.ts
@@ -43,6 +43,12 @@ mBuildInfo.set({
 	node_version: process.version
 }, 1);
 
+const mStartupTime = new prom.Gauge({
+	name: 'misskey_startup_time',
+	help: 'Misskey startup time',
+	labelNames: ['pid']
+});
+
 function greet() {
 	if (!envOption.quiet) {
 		//#region Misskey logo
@@ -112,6 +118,8 @@ export async function masterMain() {
 		});
 	}
 
+	mStartupTime.set({ pid: process.pid }, Date.now());
+
 	if (envOption.disableClustering) {
 		if (envOption.onlyServer) {
 			await server();
diff --git a/packages/backend/src/core/QueueModule.ts b/packages/backend/src/core/QueueModule.ts
index 3fb05cda3b..e5ab015585 100644
--- a/packages/backend/src/core/QueueModule.ts
+++ b/packages/backend/src/core/QueueModule.ts
@@ -31,16 +31,18 @@ export type UserWebhookDeliverQueue = Bull.Queue<UserWebhookDeliverJobData>;
 export type SystemWebhookDeliverQueue = Bull.Queue<SystemWebhookDeliverJobData>;
 
 function withMetrics<T>(queue: Bull.Queue<T>): Bull.Queue<T> {
-	setInterval(async () => {
-		mActiveJobs.set({ queue: queue.name }, await queue.getActiveCount());
-		mDelayedJobs.set({ queue: queue.name }, await queue.getDelayedCount());
-		mWaitingJobs.set({ queue: queue.name }, await queue.getWaitingCount());
-	}, 2000);
-
-	queue.on('waiting', () => {
-		mJobReceivedCounter.inc({ queue: queue.name });
-	});
+	if (process.env.NODE_ENV !== 'test') {
+		setInterval(async () => {
+			mActiveJobs.set({ queue: queue.name }, await queue.getActiveCount());
+			mDelayedJobs.set({ queue: queue.name }, await queue.getDelayedCount());
+			mWaitingJobs.set({ queue: queue.name }, await queue.getWaitingCount());
+		}, 2000);
 
+		queue.on('waiting', () => {
+			mJobReceivedCounter.inc({ queue: queue.name });
+		});
+	}
+	
 	return queue;
 }
 
diff --git a/packages/backend/src/core/activitypub/ApInboxService.ts b/packages/backend/src/core/activitypub/ApInboxService.ts
index a3bd5678d4..564bcb0fa6 100644
--- a/packages/backend/src/core/activitypub/ApInboxService.ts
+++ b/packages/backend/src/core/activitypub/ApInboxService.ts
@@ -40,16 +40,16 @@ import { ApQuestionService } from './models/ApQuestionService.js';
 import type { Resolver } from './ApResolverService.js';
 import type { IAccept, IAdd, IAnnounce, IBlock, ICreate, IDelete, IFlag, IFollow, ILike, IObject, IReject, IRemove, IUndo, IUpdate, IMove, IPost } from './type.js';
 
+const mInboxReceived = new prom.Counter({
+	name: 'misskey_ap_inbox_received_total',
+	help: 'Total number of activities received by AP inbox',
+	labelNames: ['host', 'type'],
+});
+
 @Injectable()
 export class ApInboxService {
 	private logger: Logger;
 
-	private mInboxReceived = new prom.Counter({
-		name: 'misskey_ap_inbox_received_total',
-		help: 'Total number of activities received by AP inbox',
-		labelNames: ['host', 'type'],
-	});
-
 	constructor(
 		@Inject(DI.config)
 		private config: Config,
@@ -138,49 +138,49 @@ export class ApInboxService {
 		if (actor.isSuspended) return;
 
 		if (isCreate(activity)) {
-			this.mInboxReceived.inc({ host: actor.host, type: 'create' });
+			mInboxReceived.inc({ host: actor.host, type: 'create' });
 			return await this.create(actor, activity);
 		} else if (isDelete(activity)) {
-			this.mInboxReceived.inc({ host: actor.host, type: 'delete' });
+			mInboxReceived.inc({ host: actor.host, type: 'delete' });
 			return await this.delete(actor, activity);
 		} else if (isUpdate(activity)) {
-			this.mInboxReceived.inc({ host: actor.host, type: 'update' });
+			mInboxReceived.inc({ host: actor.host, type: 'update' });
 			return await this.update(actor, activity);
 		} else if (isFollow(activity)) {
-			this.mInboxReceived.inc({ host: actor.host, type: 'follow' });
+			mInboxReceived.inc({ host: actor.host, type: 'follow' });
 			return await this.follow(actor, activity);
 		} else if (isAccept(activity)) {
-			this.mInboxReceived.inc({ host: actor.host, type: 'accept' });
+			mInboxReceived.inc({ host: actor.host, type: 'accept' });
 			return await this.accept(actor, activity);
 		} else if (isReject(activity)) {
-			this.mInboxReceived.inc({ host: actor.host, type: 'reject' });
+			mInboxReceived.inc({ host: actor.host, type: 'reject' });
 			return await this.reject(actor, activity);
 		} else if (isAdd(activity)) {
-			this.mInboxReceived.inc({ host: actor.host, type: 'add' });
+			mInboxReceived.inc({ host: actor.host, type: 'add' });
 			return await this.add(actor, activity);
 		} else if (isRemove(activity)) {
-			this.mInboxReceived.inc({ host: actor.host, type: 'remove' });
+			mInboxReceived.inc({ host: actor.host, type: 'remove' });
 			return await this.remove(actor, activity);
 		} else if (isAnnounce(activity)) {
-			this.mInboxReceived.inc({ host: actor.host, type: 'announce' });
+			mInboxReceived.inc({ host: actor.host, type: 'announce' });
 			return await this.announce(actor, activity);
 		} else if (isLike(activity)) {
-			this.mInboxReceived.inc({ host: actor.host, type: 'like' });
+			mInboxReceived.inc({ host: actor.host, type: 'like' });
 			return await this.like(actor, activity);
 		} else if (isUndo(activity)) {
-			this.mInboxReceived.inc({ host: actor.host, type: 'undo' });
+			mInboxReceived.inc({ host: actor.host, type: 'undo' });
 			return await this.undo(actor, activity);
 		} else if (isBlock(activity)) {
-			this.mInboxReceived.inc({ host: actor.host, type: 'block' });
+			mInboxReceived.inc({ host: actor.host, type: 'block' });
 			return await this.block(actor, activity);
 		} else if (isFlag(activity)) {
-			this.mInboxReceived.inc({ host: actor.host, type: 'flag' });
+			mInboxReceived.inc({ host: actor.host, type: 'flag' });
 			return await this.flag(actor, activity);
 		} else if (isMove(activity)) {
-			this.mInboxReceived.inc({ host: actor.host, type: 'move' });
+			mInboxReceived.inc({ host: actor.host, type: 'move' });
 			return await this.move(actor, activity);
 		} else {
-			this.mInboxReceived.inc({ host: actor.host, type: 'unknown' });
+			mInboxReceived.inc({ host: actor.host, type: 'unknown' });
 			return `unrecognized activity type: ${activity.type}`;
 		}
 	}
diff --git a/packages/backend/src/postgres.ts b/packages/backend/src/postgres.ts
index 6fce6a6faa..07931559bc 100644
--- a/packages/backend/src/postgres.ts
+++ b/packages/backend/src/postgres.ts
@@ -341,8 +341,9 @@ export function createPostgresDataSource(config: Config, isMain = false) {
 				db: config.redis.db ?? 0,
 			},
 		} : false,
-		logging: log ? 'all' : ['query'],
-		logger: (isMain || log) ? new MyCustomLogger(!log) : undefined,
+		logging: log,
+		logger: process.env.NODE_ENV === 'test' ? undefined : 
+			(isMain || log) ? new MyCustomLogger(!log) : undefined,
 		maxQueryExecutionTime: 500,
 		entities: entities,
 		migrations: ['../../migration/*.js'],
diff --git a/packages/backend/src/queue/processors/InboxProcessorService.ts b/packages/backend/src/queue/processors/InboxProcessorService.ts
index bd6da6c668..12b76081af 100644
--- a/packages/backend/src/queue/processors/InboxProcessorService.ts
+++ b/packages/backend/src/queue/processors/InboxProcessorService.ts
@@ -38,42 +38,42 @@ type UpdateInstanceJob = {
 	shouldUnsuspend: boolean,
 };
 
+const mIncomingApProcessingTime = new prom.Histogram({
+	name: 'misskey_incoming_ap_processing_time',
+	help: 'Incoming AP processing time in seconds',
+	labelNames: ['incoming_host', 'incoming_type', 'success'],
+	buckets: [0.01, 0.1, 0.5, 1, 5, 10, 30, 60, 300, 1800],
+});
+
+const mIncomingApEvent = new prom.Counter({
+	name: 'misskey_incoming_ap_event',
+	help: 'Incoming AP event',
+	labelNames: ['incoming_host', 'incoming_type'],
+});
+
+const mIncomingApEventAccepted = new prom.Counter({
+	name: 'misskey_incoming_ap_event_accepted',
+	help: 'Incoming AP event accepted',
+	labelNames: ['incoming_host', 'incoming_type'],
+});
+
+const mIncomingApReject = new prom.Counter({
+	name: 'misskey_incoming_ap_reject',
+	help: 'Incoming AP reject',
+	labelNames: ['incoming_host', 'incoming_type', 'reason'],
+});
+
+const mincomingApProcessingError = new prom.Counter({
+	name: 'misskey_incoming_ap_processing_error',
+	help: 'Incoming AP processing error',
+	labelNames: ['incoming_host', 'incoming_type'],
+});
+
 @Injectable()
 export class InboxProcessorService implements OnApplicationShutdown {
 	private logger: Logger;
 	private updateInstanceQueue: CollapsedQueue<MiNote['id'], UpdateInstanceJob>;
 
-	private mIncomingApProcessingTime = new prom.Histogram({
-		name: 'misskey_incoming_ap_processing_time',
-		help: 'Incoming AP processing time in seconds',
-		labelNames: ['incoming_host', 'incoming_type', 'success'],
-		buckets: [0.01, 0.1, 0.5, 1, 5, 10, 30, 60, 300, 1800],
-	});
-
-	private mIncomingApEvent = new prom.Counter({
-		name: 'misskey_incoming_ap_event',
-		help: 'Incoming AP event',
-		labelNames: ['incoming_host', 'incoming_type'],
-	});
-
-	private mIncomingApEventAccepted = new prom.Counter({
-		name: 'misskey_incoming_ap_event_accepted',
-		help: 'Incoming AP event accepted',
-		labelNames: ['incoming_host', 'incoming_type'],
-	});
-
-	private mIncomingApReject = new prom.Counter({
-		name: 'misskey_incoming_ap_reject',
-		help: 'Incoming AP reject',
-		labelNames: ['incoming_host', 'incoming_type', 'reason'],
-	});
-
-	private mincomingApProcessingError = new prom.Counter({
-		name: 'misskey_incoming_ap_processing_error',
-		help: 'Incoming AP processing error',
-		labelNames: ['incoming_host', 'incoming_type'],
-	});
-
 	constructor(
 		@Inject(DI.meta)
 		private meta: MiMeta,
@@ -127,13 +127,13 @@ export class InboxProcessorService implements OnApplicationShutdown {
 		};
 
 		if (!this.utilityService.isFederationAllowedHost(host)) {
-			incCounter(this.mIncomingApReject, { reason: 'host_not_allowed' });
+			incCounter(mIncomingApReject, { reason: 'host_not_allowed' });
 			return `Blocked request: ${host}`;
 		}
 
 		const keyIdLower = signature.keyId.toLowerCase();
 		if (keyIdLower.startsWith('acct:')) {
-			incCounter(this.mIncomingApReject, { reason: 'keyid_acct' });
+			incCounter(mIncomingApReject, { reason: 'keyid_acct' });
 			return `Old keyId is no longer supported. ${keyIdLower}`;
 		}
 
@@ -151,7 +151,7 @@ export class InboxProcessorService implements OnApplicationShutdown {
 				// 対象が4xxならスキップ
 				if (err instanceof StatusError) {
 					if (!err.isRetryable) {
-						incCounter(this.mIncomingApReject, { reason: 'actor_key_unresolvable' });
+						incCounter(mIncomingApReject, { reason: 'actor_key_unresolvable' });
 						throw new Bull.UnrecoverableError(`skip: Ignored deleted actors on both ends ${activity.actor} - ${err.statusCode}`);
 					}
 					throw new Error(`Error in actor ${activity.actor} - ${err.statusCode}`);
@@ -161,13 +161,13 @@ export class InboxProcessorService implements OnApplicationShutdown {
 
 		// それでもわからなければ終了
 		if (authUser == null) {
-			incCounter(this.mIncomingApReject, { reason: 'actor_unresolvable' });
+			incCounter(mIncomingApReject, { reason: 'actor_unresolvable' });
 			throw new Bull.UnrecoverableError('skip: failed to resolve user');
 		}
 
 		// publicKey がなくても終了
 		if (authUser.key == null) {
-			incCounter(this.mIncomingApReject, { reason: 'publickey_unresolvable' });
+			incCounter(mIncomingApReject, { reason: 'publickey_unresolvable' });
 			throw new Bull.UnrecoverableError('skip: failed to resolve user publicKey');
 		}
 
@@ -180,7 +180,7 @@ export class InboxProcessorService implements OnApplicationShutdown {
 			const ldSignature = activity.signature;
 			if (ldSignature) {
 				if (ldSignature.type !== 'RsaSignature2017') {
-					incCounter(this.mIncomingApReject, { reason: 'ld_signature_unsupported' });
+					incCounter(mIncomingApReject, { reason: 'ld_signature_unsupported' });
 					throw new Bull.UnrecoverableError(`skip: unsupported LD-signature type ${ldSignature.type}`);
 				}
 
@@ -194,12 +194,12 @@ export class InboxProcessorService implements OnApplicationShutdown {
 				// keyIdからLD-Signatureのユーザーを取得
 				authUser = await this.apDbResolverService.getAuthUserFromKeyId(ldSignature.creator);
 				if (authUser == null) {
-					incCounter(this.mIncomingApReject, { reason: 'ld_signature_user_unresolvable' });
+					incCounter(mIncomingApReject, { reason: 'ld_signature_user_unresolvable' });
 					throw new Bull.UnrecoverableError('skip: LD-Signatureのユーザーが取得できませんでした');
 				}
 
 				if (authUser.key == null) {
-					incCounter(this.mIncomingApReject, { reason: 'ld_signature_publickey_unavailable' });
+					incCounter(mIncomingApReject, { reason: 'ld_signature_publickey_unavailable' });
 					throw new Bull.UnrecoverableError('skip: LD-SignatureのユーザーはpublicKeyを持っていませんでした');
 				}
 
@@ -208,7 +208,7 @@ export class InboxProcessorService implements OnApplicationShutdown {
 				// LD-Signature検証
 				const verified = await jsonLd.verifyRsaSignature2017(activity, authUser.key.keyPem).catch(() => false);
 				if (!verified) {
-					incCounter(this.mIncomingApReject, { reason: 'ld_signature_verification_failed' });
+					incCounter(mIncomingApReject, { reason: 'ld_signature_verification_failed' });
 					throw new Bull.UnrecoverableError('skip: LD-Signatureの検証に失敗しました');
 				}
 
@@ -231,17 +231,17 @@ export class InboxProcessorService implements OnApplicationShutdown {
 
 				// もう一度actorチェック
 				if (authUser.user.uri !== activity.actor) {
-					incCounter(this.mIncomingApReject, { reason: 'ld_signature_actor_mismatch' });
+					incCounter(mIncomingApReject, { reason: 'ld_signature_actor_mismatch' });
 					throw new Bull.UnrecoverableError(`skip: LD-Signature user(${authUser.user.uri}) !== activity.actor(${activity.actor})`);
 				}
 
 				const ldHost = this.utilityService.extractDbHost(authUser.user.uri);
 				if (!this.utilityService.isFederationAllowedHost(ldHost)) {
-					incCounter(this.mIncomingApReject, { reason: 'fed_host_not_allowed' });
+					incCounter(mIncomingApReject, { reason: 'fed_host_not_allowed' });
 					throw new Bull.UnrecoverableError(`Blocked request: ${ldHost}`);
 				}
 			} else {
-				incCounter(this.mIncomingApReject, { reason: 'ld_signature_unavailable' });
+				incCounter(mIncomingApReject, { reason: 'ld_signature_unavailable' });
 				throw new Bull.UnrecoverableError(`skip: http-signature verification failed and no LD-Signature. keyId=${signature.keyId}`);
 			}
 		}
@@ -251,7 +251,7 @@ export class InboxProcessorService implements OnApplicationShutdown {
 			const signerHost = this.utilityService.extractDbHost(authUser.user.uri!);
 			const activityIdHost = this.utilityService.extractDbHost(activity.id);
 			if (signerHost !== activityIdHost) {
-				incCounter(this.mIncomingApReject, 'host_signature_mismatch');
+				incCounter(mIncomingApReject, 'host_signature_mismatch');
 				throw new Bull.UnrecoverableError(`skip: signerHost(${signerHost}) !== activity.id host(${activityIdHost}`);
 			}
 		}
@@ -279,7 +279,7 @@ export class InboxProcessorService implements OnApplicationShutdown {
 			this.fetchInstanceMetadataService.fetchInstanceMetadata(i);
 		});
 
-		incCounter(this.mIncomingApEvent, {});
+		incCounter(mIncomingApEvent, {});
 
 		// アクティビティを処理
 		const begin = +new Date();
@@ -292,25 +292,25 @@ export class InboxProcessorService implements OnApplicationShutdown {
 		} catch (e) {
 			if (e instanceof IdentifiableError) {
 				if (e.id === '689ee33f-f97c-479a-ac49-1b9f8140af99') {
-					incCounter(this.mIncomingApReject, { reason: 'blocked_notes_with_prohibited_words' });
+					incCounter(mIncomingApReject, { reason: 'blocked_notes_with_prohibited_words' });
 					return 'blocked notes with prohibited words';
 				}
 				if (e.id === '85ab9bd7-3a41-4530-959d-f07073900109') {
-					incCounter(this.mIncomingApReject, { reason: 'actor_suspended' });
+					incCounter(mIncomingApReject, { reason: 'actor_suspended' });
 					return 'actor has been suspended';
 				}
 				if (e.id === 'd450b8a9-48e4-4dab-ae36-f4db763fda7c') { // invalid Note
-					incCounter(this.mIncomingApReject, { reason: 'invalid_note' });
+					incCounter(mIncomingApReject, { reason: 'invalid_note' });
 					return e.message;
 				}
 			}
 			const end = +new Date();
-			observeHistogram(this.mIncomingApProcessingTime, { success: 'false' }, (end - begin) / 1000);
-			incCounter(this.mincomingApProcessingError, { reason: 'unknown' });
+			observeHistogram(mIncomingApProcessingTime, { success: 'false' }, (end - begin) / 1000);
+			incCounter(mincomingApProcessingError, { reason: 'unknown' });
 			throw e;
 		}
-		observeHistogram(this.mIncomingApProcessingTime, { success: 'true' }, (+new Date() - begin) / 1000);
-		incCounter(this.mIncomingApEventAccepted, {});
+		observeHistogram(mIncomingApProcessingTime, { success: 'true' }, (+new Date() - begin) / 1000);
+		incCounter(mIncomingApEventAccepted, {});
 		
 		return 'ok';
 	}
diff --git a/packages/backend/src/server/ServerService.ts b/packages/backend/src/server/ServerService.ts
index bbb0503c1e..e908375786 100644
--- a/packages/backend/src/server/ServerService.ts
+++ b/packages/backend/src/server/ServerService.ts
@@ -55,66 +55,66 @@ function categorizeRequestPath(path: string): 'api' | 'health' | 'vite' | 'other
 	return 'other';
 }
 
+const mRequestTime = new prom.Histogram({
+	name: 'misskey_http_request_duration_seconds',
+	help: 'Duration of handling HTTP requests in seconds',
+	labelNames: ['host', 'cate', 'method', 'path'],
+	buckets: [0.001, 0.1, 0.5, 1, 2, 5],
+});
+
+const mRequestsReceived = new prom.Counter({
+	name: 'misskey_http_requests_received_total',
+	help: 'Total number of HTTP requests received',
+	labelNames: [],
+});
+
+const mNotFoundServed = new prom.Counter({
+	name: 'misskey_http_not_found_served_total',
+	help: 'Total number of HTTP 404 responses served',
+	labelNames: ['method', 'cate'],
+});
+
+const mMethodNotAllowedServed = new prom.Counter({
+	name: 'misskey_http_method_not_allowed_served_total',
+	help: 'Total number of HTTP 405 responses served',
+	labelNames: ['method', 'cate'],
+});
+
+const mTooManyRequestsServed = new prom.Counter({
+	name: 'misskey_http_too_many_requests_served_total',
+	help: 'Total number of HTTP 429 responses served',
+	labelNames: ['method', 'cate'],
+});
+
+const mAggregateRequestsServed = new prom.Counter({
+	name: 'misskey_http_requests_served_total',
+	help: 'Total number of HTTP requests served including invalid requests',
+	labelNames: ['host', 'cate', 'status'],
+});
+
+const mRequestsServedByPath = new prom.Counter({
+	name: 'misskey_http_requests_served_by_path',
+	help: 'Total number of HTTP requests served',
+	labelNames: ['host', 'cate', 'method', 'path', 'status'],
+});
+
+const mFatalErrorCount = new prom.Counter({
+	name: 'misskey_fatal_http_errors_total',
+	help: 'Total number of HTTP errors that propagate to the top level',
+	labelNames: ['host', 'cate', 'method', 'path'],
+});
+
+const mLastSuccessfulRequest = new prom.Gauge({
+	name: 'misskey_http_last_successful_request_timestamp_seconds',
+	help: 'Unix Timestamp of the last successful HTTP request',
+	labelNames: [],
+});
+
 @Injectable()
 export class ServerService implements OnApplicationShutdown {
 	private logger: Logger;
 	#fastify: FastifyInstance;
 
-	private mRequestTime = new prom.Histogram({
-		name: 'misskey_http_request_duration_seconds',
-		help: 'Duration of handling HTTP requests in seconds',
-		labelNames: ['host', 'cate', 'method', 'path'],
-		buckets: [0.001, 0.1, 0.5, 1, 2, 5],
-	});
-
-	private mRequestsReceived = new prom.Counter({
-		name: 'misskey_http_requests_received_total',
-		help: 'Total number of HTTP requests received',
-		labelNames: [],
-	});
-
-	private mNotFoundServed = new prom.Counter({
-		name: 'misskey_http_not_found_served_total',
-		help: 'Total number of HTTP 404 responses served',
-		labelNames: ['method', 'cate'],
-	});
-
-	private mMethodNotAllowedServed = new prom.Counter({
-		name: 'misskey_http_method_not_allowed_served_total',
-		help: 'Total number of HTTP 405 responses served',
-		labelNames: ['method', 'cate'],
-	});
-
-	private mTooManyRequestsServed = new prom.Counter({
-		name: 'misskey_http_too_many_requests_served_total',
-		help: 'Total number of HTTP 429 responses served',
-		labelNames: ['method', 'cate'],
-	});
-
-	private mAggregateRequestsServed = new prom.Counter({
-		name: 'misskey_http_requests_served_total',
-		help: 'Total number of HTTP requests served including invalid requests',
-		labelNames: ['host', 'cate', 'status'],
-	});
-
-	private mRequestsServedByPath = new prom.Counter({
-		name: 'misskey_http_requests_served_by_path',
-		help: 'Total number of HTTP requests served',
-		labelNames: ['host', 'cate', 'method', 'path', 'status'],
-	});
-
-	private mFatalErrorCount = new prom.Counter({
-		name: 'misskey_fatal_http_errors_total',
-		help: 'Total number of HTTP errors that propagate to the top level',
-		labelNames: ['host', 'cate', 'method', 'path'],
-	});
-
-	private mLastSuccessfulRequest = new prom.Gauge({
-		name: 'misskey_http_last_successful_request_timestamp_seconds',
-		help: 'Unix Timestamp of the last successful HTTP request',
-		labelNames: [],
-	});
-
 	constructor(
 		@Inject(DI.config)
 		private config: Config,
@@ -160,14 +160,14 @@ export class ServerService implements OnApplicationShutdown {
 		if (this.config.prometheusMetrics?.enable) {
 			fastify.addHook('onRequest', (_request, reply, done) => {
 				reply.header('x-request-received', (+new Date()).toString());
-				this.mRequestsReceived.inc();
+				mRequestsReceived.inc();
 				done();
 			});
 
 			fastify.addHook('onError', (request, _reply, error, done) => {
 				const url = new URL(request.url, this.config.url);
 				const logPath = sanitizeRequestURI(url.pathname);
-				this.mFatalErrorCount.inc({
+				mFatalErrorCount.inc({
 					host: request.hostname,
 					method: request.method,
 					path: logPath,
@@ -182,14 +182,14 @@ export class ServerService implements OnApplicationShutdown {
 				const cate = categorizeRequestPath(logPath);
 				const received = reply.getHeader('x-request-received') as string;
 
-				this.mAggregateRequestsServed.inc({
+				mAggregateRequestsServed.inc({
 					host: request.hostname,
 					cate,
 					status: reply.statusCode,
 				});
 
 				if (reply.statusCode === 429) {
-					this.mTooManyRequestsServed.inc({
+					mTooManyRequestsServed.inc({
 						method: request.method,
 						cate,
 					});
@@ -199,14 +199,14 @@ export class ServerService implements OnApplicationShutdown {
 				}
 
 				if (reply.statusCode === 404) {
-					this.mNotFoundServed.inc({
+					mNotFoundServed.inc({
 						method: request.method,
 						cate,
 					});
 
 					if (received) {
 						const duration = (+new Date()) - parseInt(received);
-						this.mRequestTime.observe({
+						mRequestTime.observe({
 							host: request.hostname,
 							method: request.method,
 							cate,
@@ -218,7 +218,7 @@ export class ServerService implements OnApplicationShutdown {
 				}
 
 				if (reply.statusCode === 405) {
-					this.mMethodNotAllowedServed.inc({
+					mMethodNotAllowedServed.inc({
 						method: request.method,
 						cate,
 					});
@@ -229,7 +229,7 @@ export class ServerService implements OnApplicationShutdown {
 				if (received) {
 					const duration = (+new Date()) - parseInt(received);
 
-					this.mRequestTime.observe({
+					mRequestTime.observe({
 						host: request.hostname,
 						method: request.method,
 						cate,
@@ -243,10 +243,10 @@ export class ServerService implements OnApplicationShutdown {
 				}
 
 				if (reply.statusCode <= 299) {
-					this.mLastSuccessfulRequest.set(+new Date() / 1000);
+					mLastSuccessfulRequest.set(+new Date() / 1000);
 				}
 
-				this.mRequestsServedByPath.inc({
+				mRequestsServedByPath.inc({
 					host: request.hostname,
 					method: request.method,
 					path: logPath,
diff --git a/packages/backend/src/server/api/AuthenticateService.ts b/packages/backend/src/server/api/AuthenticateService.ts
index 13a51e3797..be75607a94 100644
--- a/packages/backend/src/server/api/AuthenticateService.ts
+++ b/packages/backend/src/server/api/AuthenticateService.ts
@@ -22,16 +22,16 @@ export class AuthenticationError extends Error {
 	}
 }
 
+const mAuthenticationFailureCounter = new prom.Counter({
+	name: 'misskey_authentication_failure_total',
+	help: 'Total number of authentication failures',
+	labelNames: ['cred_ty'],
+});
+
 @Injectable()
 export class AuthenticateService implements OnApplicationShutdown {
 	private appCache: MemoryKVCache<MiApp>;
 
-	private mAuthenticationFailureCounter = new prom.Counter({
-		name: 'misskey_authentication_failure_total',
-		help: 'Total number of authentication failures',
-		labelNames: ['cred_ty'],
-	}); 
-
 	constructor(
 		@Inject(DI.usersRepository)
 		private usersRepository: UsersRepository,
@@ -58,7 +58,7 @@ export class AuthenticateService implements OnApplicationShutdown {
 				() => this.usersRepository.findOneBy({ token }) as Promise<MiLocalUser | null>);
 
 			if (user == null) {
-				this.mAuthenticationFailureCounter.inc({ cred_ty: 'native' });
+				mAuthenticationFailureCounter.inc({ cred_ty: 'native' });
 				throw new AuthenticationError('user not found');
 			}
 
@@ -73,7 +73,7 @@ export class AuthenticateService implements OnApplicationShutdown {
 			});
 
 			if (accessToken == null) {
-				this.mAuthenticationFailureCounter.inc({ cred_ty: 'access_token' });
+				mAuthenticationFailureCounter.inc({ cred_ty: 'access_token' });
 				throw new AuthenticationError('invalid signature');
 			}
 
diff --git a/packages/backend/src/server/api/SigninApiService.ts b/packages/backend/src/server/api/SigninApiService.ts
index 80cfdf5436..01fc8fd62a 100644
--- a/packages/backend/src/server/api/SigninApiService.ts
+++ b/packages/backend/src/server/api/SigninApiService.ts
@@ -30,14 +30,14 @@ import { SigninService } from './SigninService.js';
 import type { AuthenticationResponseJSON } from '@simplewebauthn/types';
 import type { FastifyReply, FastifyRequest } from 'fastify';
 
+const mSigninFailureCounter = new prom.Counter({
+	name: 'misskey_misskey_signin_failure',
+	help: 'The number of failed sign-ins',
+	labelNames: ['reason'],
+});
+
 @Injectable()
 export class SigninApiService {
-	private mSigninFailureCounter = new prom.Counter({
-		name: 'misskey_misskey_signin_failure',
-		help: 'The number of failed sign-ins',
-		labelNames: ['reason'],
-	});
-
 	constructor(
 		@Inject(DI.config)
 		private config: Config,
@@ -100,7 +100,7 @@ export class SigninApiService {
 		// not more than 1 attempt per second and not more than 10 attempts per hour
 			await this.rateLimiterService.limit({ key: 'signin', duration: 60 * 60 * 1000, max: 10, minInterval: 1000 }, getIpHash(request.ip));
 		} catch (err) {
-			this.mSigninFailureCounter.inc({ reason: 'rate_limit' });
+			mSigninFailureCounter.inc({ reason: 'rate_limit' });
 			reply.code(429);
 			return {
 				error: {
@@ -112,13 +112,13 @@ export class SigninApiService {
 		}
 
 		if (typeof username !== 'string') {
-			this.mSigninFailureCounter.inc({ reason: 'bad_form' });
+			mSigninFailureCounter.inc({ reason: 'bad_form' });
 			reply.code(400);
 			return;
 		}
 
 		if (token != null && typeof token !== 'string') {
-			this.mSigninFailureCounter.inc({ reason: 'bad_form' });
+			mSigninFailureCounter.inc({ reason: 'bad_form' });
 			reply.code(400);
 			return;
 		}
@@ -130,14 +130,14 @@ export class SigninApiService {
 		}) as MiLocalUser;
 
 		if (user == null) {
-			this.mSigninFailureCounter.inc({ reason: 'user_not_found' });
+			mSigninFailureCounter.inc({ reason: 'user_not_found' });
 			return error(404, {
 				id: '6cc579cc-885d-43d8-95c2-b8c7fc963280',
 			});
 		}
 
 		if (user.isSuspended) {
-			this.mSigninFailureCounter.inc({ reason: 'user_suspended' });
+			mSigninFailureCounter.inc({ reason: 'user_suspended' });
 			return error(403, {
 				id: 'e03a5f46-d309-4865-9b69-56282d94e1eb',
 			});
@@ -162,7 +162,7 @@ export class SigninApiService {
 		}
 
 		if (typeof password !== 'string') {
-			this.mSigninFailureCounter.inc({ reason: 'bad_form' });
+			mSigninFailureCounter.inc({ reason: 'bad_form' });
 			reply.code(400);
 			return;
 		}
@@ -180,7 +180,7 @@ export class SigninApiService {
 				success: false,
 			});
 
-			this.mSigninFailureCounter.inc({ reason: failure?.id ?? `unknown_error_${status ?? 500}` });
+			mSigninFailureCounter.inc({ reason: failure?.id ?? `unknown_error_${status ?? 500}` });
 			return error(status ?? 500, failure ?? { id: '4e30e80c-e338-45a0-8c8f-44455efa3b76' });
 		};
 
@@ -188,35 +188,35 @@ export class SigninApiService {
 			if (process.env.NODE_ENV !== 'test') {
 				if (this.meta.enableHcaptcha && this.meta.hcaptchaSecretKey) {
 					await this.captchaService.verifyHcaptcha(this.meta.hcaptchaSecretKey, body['hcaptcha-response']).catch(err => {
-						this.mSigninFailureCounter.inc({ reason: 'captcha_verification_failed_hcaptcha' });
+						mSigninFailureCounter.inc({ reason: 'captcha_verification_failed_hcaptcha' });
 						throw new FastifyReplyError(400, err);
 					});
 				}
 
 				if (this.meta.enableMcaptcha && this.meta.mcaptchaSecretKey && this.meta.mcaptchaSitekey && this.meta.mcaptchaInstanceUrl) {
 					await this.captchaService.verifyMcaptcha(this.meta.mcaptchaSecretKey, this.meta.mcaptchaSitekey, this.meta.mcaptchaInstanceUrl, body['m-captcha-response']).catch(err => {
-						this.mSigninFailureCounter.inc({ reason: 'captcha_verification_failed_mcaptcha' });
+						mSigninFailureCounter.inc({ reason: 'captcha_verification_failed_mcaptcha' });
 						throw new FastifyReplyError(400, err);
 					});
 				}
 
 				if (this.meta.enableRecaptcha && this.meta.recaptchaSecretKey) {
 					await this.captchaService.verifyRecaptcha(this.meta.recaptchaSecretKey, body['g-recaptcha-response']).catch(err => {
-						this.mSigninFailureCounter.inc({ reason: 'captcha_verification_failed_recaptcha' });
+						mSigninFailureCounter.inc({ reason: 'captcha_verification_failed_recaptcha' });
 						throw new FastifyReplyError(400, err);
 					});
 				}
 
 				if (this.meta.enableTurnstile && this.meta.turnstileSecretKey) {
 					await this.captchaService.verifyTurnstile(this.meta.turnstileSecretKey, body['turnstile-response']).catch(err => {
-						this.mSigninFailureCounter.inc({ reason: 'captcha_verification_failed_turnstile' });
+						mSigninFailureCounter.inc({ reason: 'captcha_verification_failed_turnstile' });
 						throw new FastifyReplyError(400, err);
 					});
 				}
 
 				if (this.meta.enableTestcaptcha) {
 					await this.captchaService.verifyTestcaptcha(body['testcaptcha-response']).catch(err => {
-						this.mSigninFailureCounter.inc({ reason: 'captcha_verification_failed_testcaptcha' });
+						mSigninFailureCounter.inc({ reason: 'captcha_verification_failed_testcaptcha' });
 						throw new FastifyReplyError(400, err);
 					});
 				}
diff --git a/packages/backend/test-server/entry.ts b/packages/backend/test-server/entry.ts
index 04bf62d209..a6266e3440 100644
--- a/packages/backend/test-server/entry.ts
+++ b/packages/backend/test-server/entry.ts
@@ -5,7 +5,6 @@ import { NestFactory } from '@nestjs/core';
 import { MainModule } from '@/MainModule.js';
 import { ServerService } from '@/server/ServerService.js';
 import { loadConfig } from '@/config.js';
-import { NestLogger } from '@/NestLogger.js';
 import { INestApplicationContext } from '@nestjs/common';
 
 const config = loadConfig();
@@ -22,10 +21,8 @@ let serverService: ServerService;
 async function launch() {
 	await killTestServer();
 
-	console.log('starting application...');
-
 	app = await NestFactory.createApplicationContext(MainModule, {
-		logger: new NestLogger(),
+		logger: ["debug", "log", "error", "warn", "verbose"],
 	});
 	serverService = app.get(ServerService);
 	await serverService.launch();
@@ -84,7 +81,7 @@ async function startControllerEndpoints(port = config.port + 1000) {
 		console.log('starting application...');
 
 		app = await NestFactory.createApplicationContext(MainModule, {
-			logger: new NestLogger(),
+			logger: ["debug", "log", "error", "warn", "verbose"],
 		});
 		serverService = app.get(ServerService);
 		await serverService.launch();