chore(webapp,core): remove the unused ResourceMonitor server logging helper (#4244)

The `ResourceMonitor` server-side logging helper is no longer used. It
periodically logged the webapp process own memory, disk, and CPU usage
behind the `RESOURCE_MONITOR_ENABLED` flag (off by default), and was
also exported from `@trigger.dev/core/v3/serverOnly` with no other
consumers.

This removes the helper, its `@trigger.dev/core` export, the webapp
wiring, and the `RESOURCE_MONITOR_ENABLED` env var. The supervisor has
its own unrelated `ResourceMonitor` class, which is left untouched.

Author: carderne

.changeset/remove-resource-monitor.md

@@ -0,0 +1,5 @@
+---
+"@trigger.dev/core": patch
+---
+
+Removed the unused `ResourceMonitor` export from `@trigger.dev/core/v3/serverOnly`. It was a server-side logging helper with no remaining consumers.

apps/webapp/app/entry.server.tsx

@@ -18,7 +18,6 @@ import { assertRunOpsSplitSentinel, Prisma } from "./db.server";
 import { env } from "./env.server";
 import { eventLoopMonitor } from "./eventLoopMonitor.server";
 import { logger } from "./services/logger.server";
-import { resourceMonitor } from "./services/resourceMonitor.server";
 import { singleton } from "./utils/singleton";
 import { remoteBuildsEnabled } from "./v3/remoteImageBuilder.server";
 import {
@@ -309,7 +308,3 @@ if (remoteBuildsEnabled()) {
 } else {
   console.log("🏗️  Local builds enabled");
 }
-
-if (env.RESOURCE_MONITOR_ENABLED === "1") {
-  resourceMonitor.startMonitoring(1000);
-}

apps/webapp/app/env.server.ts

@@ -792,7 +792,6 @@ const EnvironmentSchema = z
     CENTS_PER_RUN: z.coerce.number().default(0),
 
     EVENT_LOOP_MONITOR_ENABLED: z.string().default("1"),
-    RESOURCE_MONITOR_ENABLED: z.string().default("0"),
     MAXIMUM_LIVE_RELOADING_EVENTS: z.coerce.number().int().default(1000),
     MAXIMUM_TRACE_SUMMARY_VIEW_COUNT: z.coerce.number().int().default(25_000),
     MAXIMUM_TRACE_DETAILED_SUMMARY_VIEW_COUNT: z.coerce.number().int().default(10_000),

apps/webapp/app/services/resourceMonitor.server.ts

@@ -6,5 +6,4 @@ export * from "./k8s.js";
 export * from "./jumpHash.js";
 export * from "../apiClient/version.js";
 export * from "./placementTags.js";
-export * from "./resourceMonitor.js";
 export * from "./idempotencyKeys.js";