diff --git a/packages/backend/package.json b/packages/backend/package.json
index 7ff83b54d..7d93ac6eb 100644
--- a/packages/backend/package.json
+++ b/packages/backend/package.json
@@ -103,6 +103,7 @@
 		"pg": "8.11.1",
 		"private-ip": "2.3.4",
 		"probe-image-size": "7.2.3",
+		"prom-client": "^15.1.0",
 		"promise-limit": "2.7.0",
 		"punycode": "2.3.0",
 		"pureimage": "0.3.15",
diff --git a/packages/backend/src/config/load.ts b/packages/backend/src/config/load.ts
index 34b667226..050079211 100644
--- a/packages/backend/src/config/load.ts
+++ b/packages/backend/src/config/load.ts
@@ -72,6 +72,8 @@ export default function load() {
 	if (config.wordMuteCache.ttlSeconds == null) throw new Error('Failed to parse config.wordMuteCache.ttl');
 
 	config.searchEngine = config.searchEngine ?? 'https://duckduckgo.com/?q=';
+	config.enableMetrics = config.enableMetrics ?? false;
+	config.enableObliterate = config.enableObliterate ?? false;
 
 	mixin.version = meta.version;
 	mixin.host = url.host;
diff --git a/packages/backend/src/config/types.ts b/packages/backend/src/config/types.ts
index bdfadc7f4..dbfeddc56 100644
--- a/packages/backend/src/config/types.ts
+++ b/packages/backend/src/config/types.ts
@@ -92,10 +92,15 @@ export type Source = {
 
 	deliverJobConcurrency?: number;
 	inboxJobConcurrency?: number;
+	obliterateJobConcurrency?: number;
 	deliverJobPerSec?: number;
 	inboxJobPerSec?: number;
+	obliterateJobPerSec?: number;
 	deliverJobMaxAttempts?: number;
 	inboxJobMaxAttempts?: number;
+	obliterateJobMaxAttempts?: number;
+
+	enableObliterate: boolean;
 
 	syslog: {
 		host: string;
@@ -152,6 +157,7 @@ export type Source = {
 		s3ForcePathStyle?: boolean;
 	};
 	summalyProxyUrl?: string;
+	enableMetrics?: boolean;
 };
 
 /**
diff --git a/packages/backend/src/metrics.ts b/packages/backend/src/metrics.ts
new file mode 100644
index 000000000..bd9925c9d
--- /dev/null
+++ b/packages/backend/src/metrics.ts
@@ -0,0 +1,135 @@
+import Router from "@koa/router";
+import {
+	collectDefaultMetrics,
+	register,
+	Gauge,
+	Counter,
+	CounterConfiguration,
+} from "prom-client";
+import config from "./config/index.js";
+import { queues } from "./queue/queues.js";
+import cluster from "node:cluster";
+import Xev from "xev";
+
+const xev = new Xev();
+const metricsMaster = cluster.worker?.id === 1;
+
+if (config.enableMetrics) {
+	if (metricsMaster) {
+		collectDefaultMetrics();
+
+		new Gauge({
+			name: "iceshrimp_queue_jobs",
+			help: "Amount of jobs in the bull queues",
+			labelNames: ["queue", "status"] as const,
+			async collect() {
+				for (const queue of queues) {
+					const counts = await queue.getJobCounts();
+					this.set({ queue: queue.name, status: "completed" }, counts.completed);
+					this.set({ queue: queue.name, status: "waiting" }, counts.waiting);
+					this.set({ queue: queue.name, status: "active" }, counts.active);
+					this.set({ queue: queue.name, status: "delayed" }, counts.delayed);
+					this.set({ queue: queue.name, status: "failed" }, counts.failed);
+				}
+			},
+		});
+	}
+}
+
+if (metricsMaster) {
+	xev.on("registry-request", async () => {
+		try {
+			const metrics = await register.metrics();
+			xev.emit("registry-response", {
+				contentType: register.contentType,
+				body: metrics
+			});
+		} catch (error) {
+			xev.emit("registry-response", { error });
+		}
+	});
+}
+
+export const handleMetrics: Router.Middleware = async (ctx) => {
+	try {
+		if (metricsMaster) {
+			ctx.set("content-type", register.contentType);
+			ctx.body = await register.metrics();
+		} else {
+			const wait = new Promise<void>((resolve, reject) => {
+				const timeout = setTimeout(
+					() => reject("Timeout while waiting for cluster master"),
+					1000 * 60
+				);
+				xev.once("registry-response", (response) => {
+					clearTimeout(timeout);
+					if (response.error) reject(response.error);
+					ctx.set("content-type", response.contentType);
+					ctx.body = response.body;
+					resolve();
+				});
+			});
+			xev.emit("registry-request");
+			await wait;
+		}
+	} catch (err) {
+		ctx.res.statusCode = 500;
+		ctx.body = err;
+	}
+};
+
+const counter = (configuration: CounterConfiguration<string>) => {
+	if (config.enableMetrics) {
+		if (metricsMaster) {
+			const counter = new Counter(configuration);
+			counter.reset(); // initialize internal hashmap
+			xev.on(`metrics-counter-${configuration.name}`, () => counter.inc());
+			return () => counter.inc();
+		} else {
+			return () => xev.emit(`metrics-counter-${configuration.name}`);
+		}
+	} else {
+		return () => { };
+	}
+};
+
+export const tickOutbox = counter({
+	name: "iceshrimp_outbox_total",
+	help: "Total AP outbox calls",
+});
+
+export const tickInbox = counter({
+	name: "iceshrimp_inbox_total",
+	help: "Total AP inbox calls",
+});
+
+export const tickFetch = counter({
+	name: "iceshrimp_fetch_total",
+	help: "Total AP fetch calls",
+});
+
+export const tickResolve = counter({
+	name: "iceshrimp_resolve_total",
+	help: "Total AP resolve calls",
+});
+
+export const tickObliterate = counter({
+		name: "iceshrimp_obliterate_total",
+		help: "Total obliterate jobs processed",
+	});
+	
+
+export const tickBiteIncoming = counter({
+	name: "iceshrimp_bite_remote_incoming_total",
+	help: "Total bites received from remote",
+});
+
+export const tickBiteOutgoing = counter({
+	name: "iceshrimp_bite_remote_outgoing_total",
+	help: "Total bites sent to remote",
+});
+
+export const tickBiteLocal = counter ({
+	name: "iceshrimp_bite_local_total",
+	help: "Total local bites"
+});
diff --git a/packages/backend/src/migration/1705383368782-index-sharedInbox.ts b/packages/backend/src/migration/1705383368782-index-sharedInbox.ts
new file mode 100644
index 000000000..bd66e1261
--- /dev/null
+++ b/packages/backend/src/migration/1705383368782-index-sharedInbox.ts
@@ -0,0 +1,13 @@
+import { MigrationInterface, QueryRunner } from "typeorm";
+
+export class IndexSharedInbox1705383368782 implements MigrationInterface {
+	name = 'IndexSharedInbox1705383368782'
+
+	public async up(queryRunner: QueryRunner): Promise<void> {
+		await queryRunner.query(`CREATE INDEX "IDX_92d3de2fe0efd289de109b6627" ON "user" ("sharedInbox") `);
+	}
+
+	public async down(queryRunner: QueryRunner): Promise<void> {
+		await queryRunner.query(`DROP INDEX "public"."IDX_92d3de2fe0efd289de109b6627"`);
+	}
+}
diff --git a/packages/backend/src/models/entities/user.ts b/packages/backend/src/models/entities/user.ts
index 92de37e3f..8234f0124 100644
--- a/packages/backend/src/models/entities/user.ts
+++ b/packages/backend/src/models/entities/user.ts
@@ -11,6 +11,7 @@ import { DriveFile } from "./drive-file.js";
 
 @Entity()
 @Index(["usernameLower", "host"], { unique: true })
+@Index(["sharedInbox"])
 export class User {
 	@PrimaryColumn(id())
 	public id: string;
diff --git a/packages/backend/src/queue/index.ts b/packages/backend/src/queue/index.ts
index 787fa848f..0e998ed81 100644
--- a/packages/backend/src/queue/index.ts
+++ b/packages/backend/src/queue/index.ts
@@ -14,6 +14,7 @@ import processObjectStorage from "./processors/object-storage/index.js";
 import processSystemQueue from "./processors/system/index.js";
 import processWebhookDeliver from "./processors/webhook-deliver.js";
 import processBackground from "./processors/background/index.js";
+import processObliterate from "./processors/obliterate.js";
 import { endedPollNotification } from "./processors/ended-poll-notification.js";
 import { queueLogger } from "./logger.js";
 import { getJobInfo } from "./get-job-info.js";
@@ -26,8 +27,10 @@ import {
 	endedPollNotificationQueue,
 	webhookDeliverQueue,
 	backgroundQueue,
+	obliterateQueue,
 } from "./queues.js";
 import type { ThinUser } from "./types.js";
+import { updateInboxCache } from "@/services/note/delete.js";
 
 function renderError(e: Error): any {
 	return {
@@ -43,6 +46,7 @@ const webhookLogger = queueLogger.createSubLogger("webhook");
 const inboxLogger = queueLogger.createSubLogger("inbox");
 const dbLogger = queueLogger.createSubLogger("db");
 const objectStorageLogger = queueLogger.createSubLogger("objectStorage");
+const obliterateLogger = queueLogger.createSubLogger("obliterate");
 
 systemQueue
 	.on("waiting", (jobId) => systemLogger.debug(`waiting id=${jobId}`))
@@ -157,6 +161,30 @@ webhookDeliverQueue
 		webhookLogger.warn(`stalled ${getJobInfo(job)} to=${job.data.to}`),
 	);
 
+obliterateQueue
+	.on("waiting", (jobId) => obliterateLogger.debug(`waiting id=${jobId}`))
+	.on("active", (job) =>
+		obliterateLogger.debug(
+			`active ${getJobInfo(job, true)} to=${job.data.to}`,
+		),
+	)
+	.on("completed", (job, result) =>
+		obliterateLogger.debug(
+			`completed(${result}) ${getJobInfo(job, true)} to=${job.data.to}`,
+		),
+	)
+	.on("failed", (job, err) =>
+		obliterateLogger.warn(
+			`failed(${err}) ${getJobInfo(job)} to=${job.data.to}`,
+		),
+	)
+	.on("error", (job: any, err: Error) =>
+		obliterateLogger.error(`error ${err}`, { job, e: renderError(err) }),
+	)
+	.on("stalled", (job) =>
+		obliterateLogger.warn(`stalled ${getJobInfo(job)} to=${job.data.to}`),
+	
+
 export function deliver(user: ThinUser, content: unknown, to: string | null) {
 	if (content == null) return null;
 	if (to == null) return null;
@@ -514,6 +542,30 @@ export function webhookDeliver(
 	});
 }
 
+export function obliterate(
+		user: ThinUser,
+		content: unknown,
+		to: string,
+	) {
+		const data = {
+			user: {
+				id: user.id,
+			},
+			content,
+			to,
+		};
+	
+		return obliterateQueue.add(data, {
+			attempts: config.obliterateJobMaxAttempts || 4,
+			timeout: 1 * 60 * 1000, // 1min
+			backoff: {
+				type: "apBackoff",
+			},
+			removeOnComplete: true,
+			removeOnFail: true,
+		});
+	}
+	
 export default function () {
 	if (envOption.onlyServer) return;
 
@@ -602,6 +654,11 @@ export default function () {
 	);
 
 	processSystemQueue(systemQueue);
+	updateInboxCache();
+	obliterateQueue.process(
+		config.obliterateJobConcurrency || 16,
+		processObliterate,
+	);
 }
 
 export function destroy() {
@@ -614,4 +671,9 @@ export function destroy() {
 		inboxLogger.succ(`Cleaned ${jobs.length} ${status} jobs`);
 	});
 	inboxQueue.clean(0, "delayed");
+
+	obliterateQueue.once("cleaned", (jobs, status) => {
+		obliterateLogger.succ(`Cleaned ${jobs.length} ${status} jobs`);
+	});
+	obliterateQueue.clean(0, "delayed");
 }
diff --git a/packages/backend/src/queue/processors/deliver.ts b/packages/backend/src/queue/processors/deliver.ts
index 74dcc3abf..f5d511ced 100644
--- a/packages/backend/src/queue/processors/deliver.ts
+++ b/packages/backend/src/queue/processors/deliver.ts
@@ -14,6 +14,7 @@ import { StatusError } from "@/misc/fetch.js";
 import { shouldSkipInstance } from "@/misc/skipped-instances.js";
 import type { DeliverJobData } from "@/queue/types.js";
 import type Bull from "bull";
+import { tickOutbox } from "@/metrics.js";
 import { patchText, shouldPatchText } from "@/remote/activitypub/renderer/note.js";
 
 const logger = new Logger("deliver");
@@ -72,6 +73,8 @@ export default async (job: Bull.Job<DeliverJobData>) => {
 			federationChart.deliverd(i.host, true);
 		})();
 
+		tickOutbox();
+
 		return "Success";
 	} catch (res) {
 		// Update stats
diff --git a/packages/backend/src/queue/processors/inbox.ts b/packages/backend/src/queue/processors/inbox.ts
index 3c87727c4..e310c4760 100644
--- a/packages/backend/src/queue/processors/inbox.ts
+++ b/packages/backend/src/queue/processors/inbox.ts
@@ -23,6 +23,7 @@ import type { CacheableRemoteUser } from "@/models/entities/user.js";
 import type { UserPublickey } from "@/models/entities/user-publickey.js";
 import { shouldBlockInstance } from "@/misc/should-block-instance.js";
 import { verifySignature } from "@/remote/activitypub/check-fetch.js";
+import { tickInbox } from "@/metrics.js";
 
 const logger = new Logger("inbox");
 
@@ -217,6 +218,8 @@ export default async (job: Bull.Job<InboxJobData>): Promise<string> => {
 		}
 	}
 
+	tickInbox();
+
 	// アクティビティを処理
 	await perform(authUser.user, activity);
 	return "ok";
diff --git a/packages/backend/src/queue/processors/obliterate.ts b/packages/backend/src/queue/processors/obliterate.ts
new file mode 100644
index 000000000..fdcb83a81
--- /dev/null
+++ b/packages/backend/src/queue/processors/obliterate.ts
@@ -0,0 +1,60 @@
+import Bull from "bull";
+import { DeliverJobData } from "../types.js";
+import { tickObliterate } from "@/metrics.js";
+import { StatusError } from "@/misc/fetch.js";
+import request from "@/remote/activitypub/request.js";
+import { registerOrFetchInstanceDoc } from "@/services/register-or-fetch-instance-doc.js";
+import { DAY, HOUR } from "@/const.js";
+import { Instances } from "@/models/index.js";
+
+export default async (job: Bull.Job<DeliverJobData>) => {
+	const { host } = new URL(job.data.to);
+	try {
+		const notResponding = await Instances.createQueryBuilder("i")
+			.where("i.host = :host", { host })
+			.andWhere("i.isNotResponding")
+			.andWhere("i.lastCommunicatedAt < :cutoff", {
+				cutoff: new Date(Date.now() - DAY * 14),
+			})
+			.cache(HOUR)
+			.getCount();
+		// what are these string returns anyways. what do they mean. why did bull implement it like
+		// this. do string returns mean anything? is the actual string itself important? would i
+		// achieve the same by returning your home address? many such questions
+		if (notResponding && (Math.random() > 0.01)) throw "skip";
+
+		await request(job.data.user, job.data.to, job.data.content, 3000);
+
+		tickObliterate();
+
+		registerOrFetchInstanceDoc(host).then((i) => {
+			Instances.update(i.id, {
+				latestRequestSentAt: new Date(),
+				latestStatus: 200,
+				lastCommunicatedAt: new Date(),
+				isNotResponding: false,
+			});
+		});
+
+		return "Success";
+	} catch (res) {
+		registerOrFetchInstanceDoc(host).then((i) => {
+			Instances.update(i.id, {
+				latestRequestSentAt: new Date(),
+				latestStatus:
+					res instanceof StatusError ? res.statusCode : null,
+				isNotResponding: true,
+			});
+		});
+
+		if (res instanceof StatusError) {
+			if (res.isClientError) {
+				return `${res.statusCode} ${res.statusMessage}`;
+			}
+
+			throw new Error(`${res.statusCode} ${res.statusMessage}`);
+		} else {
+			throw res;
+		}
+	}
+};
diff --git a/packages/backend/src/queue/queues.ts b/packages/backend/src/queue/queues.ts
index 6b0eb2de4..a117da9ac 100644
--- a/packages/backend/src/queue/queues.ts
+++ b/packages/backend/src/queue/queues.ts
@@ -28,6 +28,10 @@ export const webhookDeliverQueue = initializeQueue<WebhookDeliverJobData>(
 	64,
 );
 export const backgroundQueue = initializeQueue<Record<string, unknown>>("bg");
+export const obliterateQueue = initializeQueue<DeliverJobData>(
+		"obliterate",
+		config.obliterateJobPerSec || 16,
+	);
 
 export const queues = [
 	systemQueue,
@@ -38,4 +42,5 @@ export const queues = [
 	objectStorageQueue,
 	webhookDeliverQueue,
 	backgroundQueue,
+	obliterateQueue,
 ];
diff --git a/packages/backend/src/remote/activitypub/check-fetch.ts b/packages/backend/src/remote/activitypub/check-fetch.ts
index f299a1624..cb8ec0b6f 100644
--- a/packages/backend/src/remote/activitypub/check-fetch.ts
+++ b/packages/backend/src/remote/activitypub/check-fetch.ts
@@ -12,6 +12,7 @@ import type { UserPublickey } from "@/models/entities/user-publickey.js";
 import { verify } from "node:crypto";
 import { toSingle } from "@/prelude/array.js";
 import { createHash } from "node:crypto";
+import { tickFetch } from "@/metrics.js";
 
 export async function hasSignature(req: IncomingMessage): Promise<string> {
 	const meta = await fetchMeta();
@@ -120,7 +121,12 @@ export async function checkFetch(req: IncomingMessage): Promise<{ status: number
 			return { status: 403 };
 		}
 
-		return verifySignature(signature, authUser.key) ? 200 : 401;
+				if (!verifySignature(signature, authUser.key)) {
+						return 401;
+					}
+			
+					tickFetch();
+					return 200;
 	}
 	return { status: 200 };
 }
diff --git a/packages/backend/src/remote/activitypub/deliver-manager.ts b/packages/backend/src/remote/activitypub/deliver-manager.ts
index 7f0215e3b..5625cd76a 100644
--- a/packages/backend/src/remote/activitypub/deliver-manager.ts
+++ b/packages/backend/src/remote/activitypub/deliver-manager.ts
@@ -76,7 +76,7 @@ export default class DeliverManager {
 	/**
 	 * Execute delivers
 	 */
-	public async execute() {
+	public async execute(): Promise<Set<string>> {
 		if (!Users.isLocalUser(this.actor)) return;
 
 		const inboxes = new Set<string>();
@@ -155,6 +155,8 @@ export default class DeliverManager {
 
 			deliver(this.actor, this.activity, inbox);
 		}
+
+		return inboxes;
 	}
 }
 
@@ -167,10 +169,10 @@ export default class DeliverManager {
 export async function deliverToFollowers(
 	actor: { id: ILocalUser["id"]; host: null },
 	activity: any,
-) {
+): Promise<Set<string>> {
 	const manager = new DeliverManager(actor, activity);
 	manager.addFollowersRecipe();
-	await manager.execute();
+	return await manager.execute();
 }
 
 /**
@@ -182,9 +184,9 @@ export async function deliverToUser(
 	actor: { id: ILocalUser["id"]; host: null },
 	activity: any,
 	to: IRemoteUser,
-) {
+): Promise<Set<string>> {
 	const manager = new DeliverManager(actor, activity);
 	manager.addDirectRecipe(to);
-	await manager.execute();
+	return await manager.execute();
 }
 //#endregion
diff --git a/packages/backend/src/remote/activitypub/kernel/bite.ts b/packages/backend/src/remote/activitypub/kernel/bite.ts
index ecce5cc7e..157d588ae 100644
--- a/packages/backend/src/remote/activitypub/kernel/bite.ts
+++ b/packages/backend/src/remote/activitypub/kernel/bite.ts
@@ -6,6 +6,7 @@ import config from "@/config/index.js";
 import { genId } from "@/misc/gen-id.js";
 import { createBite } from "@/services/create-bite.js";
 import { Bite } from "@/models/entities/bite.js";
+import { tickBiteIncoming } from "@/metrics.js";
 
 export default async (
 	actor: CacheableRemoteUser,
@@ -75,5 +76,7 @@ export default async (
 		bite.published ? new Date(bite.published) : null,
 	);
 
+	tickBiteIncoming();
+
 	return "ok";
 };
diff --git a/packages/backend/src/remote/activitypub/request.ts b/packages/backend/src/remote/activitypub/request.ts
index e4aa190d3..83d23405b 100644
--- a/packages/backend/src/remote/activitypub/request.ts
+++ b/packages/backend/src/remote/activitypub/request.ts
@@ -5,7 +5,7 @@ import { getResponse } from "../../misc/fetch.js";
 import { createSignedPost, createSignedGet } from "./ap-request.js";
 import { apLogger } from "@/remote/activitypub/logger.js";
 
-export default async (user: { id: User["id"] }, url: string, object: any) => {
+export default async (user: { id: User["id"] }, url: string, object: any, timeout = undefined) => {
 	const body = JSON.stringify(object);
 
 	const keypair = await getUserKeypair(user.id);
@@ -27,6 +27,7 @@ export default async (user: { id: User["id"] }, url: string, object: any) => {
 		method: req.request.method,
 		headers: req.request.headers,
 		body,
+		timeout,
 	});
 };
 
diff --git a/packages/backend/src/remote/activitypub/resolver.ts b/packages/backend/src/remote/activitypub/resolver.ts
index 8baa2958a..a0b47778e 100644
--- a/packages/backend/src/remote/activitypub/resolver.ts
+++ b/packages/backend/src/remote/activitypub/resolver.ts
@@ -27,6 +27,7 @@ import { shouldBlockInstance } from "@/misc/should-block-instance.js";
 import { apLogger } from "@/remote/activitypub/logger.js";
 import { In, IsNull, Not } from "typeorm";
 import renderBite from "@/remote/activitypub/renderer/bite.js";
+import { tickResolve } from "@/metrics.js";
 
 export default class Resolver {
 	private history: Set<string>;
@@ -127,7 +128,10 @@ export default class Resolver {
 		const {res, object} = await this.doFetch(value);
 
 		if (object.id == null) throw new Error("Object has no ID");
-		if (res.finalUrl === object.id) return object;
+				if (res.finalUrl === object.id) {
+						tickResolve();
+						return object;
+					}
 
 		if (new URL(res.finalUrl).host !== new URL(object.id).host)
 			throw new Error("Object ID host doesn't match final url host");
@@ -137,6 +141,8 @@ export default class Resolver {
 		if (finalRes.finalUrl !== finalObject.id)
 			throw new Error("Object ID still doesn't match final URL after second fetch attempt")
 
+		tickResolve();
+
 		return finalObject;
 	}
 
diff --git a/packages/backend/src/server/activitypub.ts b/packages/backend/src/server/activitypub.ts
index 347660a70..3545b95c7 100644
--- a/packages/backend/src/server/activitypub.ts
+++ b/packages/backend/src/server/activitypub.ts
@@ -37,6 +37,7 @@ import { serverLogger } from "./index.js";
 import config from "@/config/index.js";
 import Koa from "koa";
 import renderBite from "@/remote/activitypub/renderer/bite.js";
+import { tickFetch } from "@/metrics.js";
 
 // Init router
 const router = new Router();
@@ -225,6 +226,7 @@ router.get("/users/:user/collections/featured", Featured);
 router.get("/users/:user/publickey", async (ctx) => {
 	const instanceActor = await getInstanceActor();
 	if (ctx.params.user === instanceActor.id) {
+		tickFetch();
 		ctx.body = renderActivity(
 			renderKey(instanceActor, await getUserKeypair(instanceActor.id)),
 		);
@@ -289,6 +291,7 @@ router.get("/users/:user", async (ctx, next) => {
 
 	const instanceActor = await getInstanceActor();
 	if (ctx.params.user === instanceActor.id) {
+		tickFetch();
 		await userInfo(ctx, instanceActor);
 		return;
 	}
@@ -313,6 +316,7 @@ router.get("/@:user", async (ctx, next) => {
 	if (!isActivityPubReq(ctx)) return await next();
 
 	if (ctx.params.user === "instance.actor") {
+		tickFetch();
 		const instanceActor = await getInstanceActor();
 		await userInfo(ctx, instanceActor);
 		return;
@@ -334,6 +338,7 @@ router.get("/@:user", async (ctx, next) => {
 });
 
 router.get("/actor", async (ctx, next) => {
+	tickFetch();
 	const instanceActor = await getInstanceActor();
 	await userInfo(ctx, instanceActor);
 });
diff --git a/packages/backend/src/server/index.ts b/packages/backend/src/server/index.ts
index 929efd73b..3acce660f 100644
--- a/packages/backend/src/server/index.ts
+++ b/packages/backend/src/server/index.ts
@@ -33,6 +33,7 @@ import removeTrailingSlash from "koa-remove-trailing-slashes";
 import { koaBody } from "koa-body";
 import { setupEndpointsAuthRoot } from "@/server/api/mastodon/endpoints/auth.js";
 import { CatchErrorsMiddleware } from "@/server/api/mastodon/middleware/catch-errors.js";
+import { handleMetrics } from "@/metrics.js";
 export const serverLogger = new Logger("server", "gray", false);
 
 // Init app
@@ -117,6 +118,10 @@ router.get("/identicon/:x", async (ctx) => {
 	}
 });
 
+if (config.enableMetrics) {
+		router.get("/metrics", handleMetrics);
+	}
+
 mastoRouter.use(
 	koaBody({
 		urlencoded: true,
diff --git a/packages/backend/src/services/create-bite.ts b/packages/backend/src/services/create-bite.ts
index dea96e20d..1c0f3b08c 100644
--- a/packages/backend/src/services/create-bite.ts
+++ b/packages/backend/src/services/create-bite.ts
@@ -6,6 +6,7 @@ import { renderActivity } from "@/remote/activitypub/renderer/index.js";
 import renderBite from "@/remote/activitypub/renderer/bite.js";
 import { deliverToUser } from "@/remote/activitypub/deliver-manager.js";
 import { createNotification } from "./create-notification.js";
+import { tickBiteLocal, tickBiteOutgoing } from "@/metrics.js";
 
 export async function createBite(
 	sender: User,
@@ -61,6 +62,8 @@ export async function createBite(
 			renderActivity(await renderBite(bite)),
 			deliverTarget,
 		);
+
+		tickBiteOutgoing();
 	}
 
 	if (Users.isLocalUser(deliverTarget)) {
@@ -68,6 +71,8 @@ export async function createBite(
 			notifierId: sender.id,
 			biteId: bite.id,
 		});
+
+		if (Users.isLocalUser(sender)) tickBiteLocal();
 	}
 
 	return id;
diff --git a/packages/backend/src/services/note/delete.ts b/packages/backend/src/services/note/delete.ts
index a3c2fad12..cc765183c 100644
--- a/packages/backend/src/services/note/delete.ts
+++ b/packages/backend/src/services/note/delete.ts
@@ -21,6 +21,9 @@ import {
 import { countSameRenotes } from "@/misc/count-same-renotes.js";
 import { registerOrFetchInstanceDoc } from "../register-or-fetch-instance-doc.js";
 import { deliverToRelays } from "../relay.js";
+import { HOUR } from "@/const.js";
+import { Mutex } from "async-mutex";
+import { obliterate } from "@/queue/index.js";
 
 /**
  * 投稿を削除します。
@@ -174,15 +177,62 @@ async function getMentionedRemoteUsers(note: Note) {
 	})) as IRemoteUser[];
 }
 
+let inboxCache: string[] = [];
+let inboxCacheExpiration = 0;
+const inboxCacheUpdate = new Mutex();
+
+export async function updateInboxCache() {
+	// we only want one instance of the update running at a time
+	const release = await inboxCacheUpdate.acquire();
+	try {
+		// the cache might have been updated while we were
+		// acquiring the mutex so we check again
+		if (inboxCacheExpiration < new Date().getTime()) {
+			const result = await Users.query(
+				'SELECT DISTINCT ON (u."sharedInbox") u."sharedInbox" FROM \
+				"user" as u INNER JOIN "instance" as i ON i."host" = u."host" \
+				WHERE u."sharedInbox" IS NOT NULL AND i."isNotResponding" = false',
+			);
+			inboxCache = result.map((user: any) => user.sharedInbox as string);
+			inboxCacheExpiration = new Date().getTime() + HOUR;
+		}
+	} finally {
+		release();
+	}
+}
+
+
 async function deliverToConcerned(
 	user: { id: ILocalUser["id"]; host: null },
 	note: Note,
 	content: any,
 ) {
-	deliverToFollowers(user, content);
 	deliverToRelays(user, content);
 	const remoteUsers = await getMentionedRemoteUsers(note);
-	for (const remoteUser of remoteUsers) {
-		deliverToUser(user, content, remoteUser);
+		const sets = await Promise.all([
+				deliverToFollowers(user, content),
+				...remoteUsers.map((remoteUser) =>
+					deliverToUser(user, content, remoteUser),
+				),
+			]);
+			const alreadyDelivered = new Set();
+			for (const set of sets) {
+				for (const inbox of set) {
+					alreadyDelivered.add(inbox);
+				}
+			}
+		
+			if (config.enableObliterate) {
+				// sacrificate note to the void goddess \o/
+				if (inboxCacheExpiration < new Date().getTime()) {
+					await updateInboxCache();
+				}
+		
+				const toObliterate = inboxCache.filter(
+					(inbox) => !alreadyDelivered.has(inbox),
+				);
+				for (const inbox of toObliterate) {
+					obliterate(user, content, inbox);
+				}
 	}
 }
diff --git a/yarn.lock b/yarn.lock
index 2574f9f44..6f14ef389 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -1936,6 +1936,12 @@ __metadata:
   checksum: 10/673c11518dba2e582e42415cbefe928513616f3af25e12f6e4e6b1b98b52b3e6c14bc251a361654af63cd64f208f22a1f7556fa49da2bf7efcf28cb14f16f807
   languageName: node
   linkType: hard
+"@opentelemetry/api@npm:^1.4.0":
+  version: 1.7.0
+  resolution: "@opentelemetry/api@npm:1.7.0"
+  checksum: 10/bcf7afa7051dcd4583898a68f8a57fb4c85b5cedddf7b6eb3616595c0b3bcd7f5448143b8355b00935a755de004d6285489f8e132f34127efe7b1be404622a3e
+  languageName: node
+  linkType: hard
 
 "@paralleldrive/cuid2@npm:^2.2.2":
   version: 2.2.2
@@ -5379,6 +5385,7 @@ __metadata:
     pg: "npm:8.11.1"
     private-ip: "npm:2.3.4"
     probe-image-size: "npm:7.2.3"
+	prom-client: "npm:^15.1.0"
     promise-limit: "npm:2.7.0"
     pug: "npm:3.0.2"
     punycode: "npm:2.3.0"
@@ -5540,6 +5547,13 @@ __metadata:
   languageName: node
   linkType: hard
 
+"bintrees@npm:1.0.2":
+  version: 1.0.2
+  resolution: "bintrees@npm:1.0.2"
+  checksum: 10/071896cea5ea5413316c8436e95799444c208630d5c539edd8a7089fc272fc5d3634aa4a2e4847b28350dda1796162e14a34a0eda53108cc5b3c2ff6a036c1fa
+  languageName: node
+  linkType: hard
+
 "bl@npm:^1.0.0":
   version: 1.2.3
   resolution: "bl@npm:1.2.3"
@@ -16926,6 +16940,16 @@ __metadata:
   languageName: node
   linkType: hard
 
+"prom-client@npm:^15.1.0":
+  version: 15.1.0
+  resolution: "prom-client@npm:15.1.0"
+  dependencies:
+    "@opentelemetry/api": "npm:^1.4.0"
+    tdigest: "npm:^0.1.1"
+  checksum: 10/ecb6f40de755ca9cc6dde758d195ed3e1d3b47a341d2092af8c18dbf7e6ef1079c8b8bb02496f2f430cf8bd9d391c1ea5bebbb85cdda95f67dad2dbfb90509aa
+  languageName: node
+  linkType: hard
+
 "promise-limit@npm:2.7.0":
   version: 2.7.0
   resolution: "promise-limit@npm:2.7.0"
@@ -19493,6 +19517,15 @@ __metadata:
   languageName: node
   linkType: hard
 
+"tdigest@npm:^0.1.1":
+  version: 0.1.2
+  resolution: "tdigest@npm:0.1.2"
+  dependencies:
+    bintrees: "npm:1.0.2"
+  checksum: 10/45be99fa52dab74b8edafe150e473cdc45aa1352c75ed516a39905f350a08c3175f6555598111042c3677ba042d7e3cae6b5ce4c663fe609bc634f326aabc9d6
+  languageName: node
+  linkType: hard
+
 "terminal-link@npm:^2.0.0":
   version: 2.1.1
   resolution: "terminal-link@npm:2.1.1"