[
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    "id": "34a83b3fbe73f8f8",
    "type": "tab",
    "label": "Heap Leak Lab",
    "disabled": false,
    "info": "Synthetic heap retention lab for node-red-contrib-heap-guardian."
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    "type": "http in",
    "z": "34a83b3fbe73f8f8",
    "name": "GET /heap-guardian/status",
    "url": "/heap-guardian/status",
    "method": "get",
    "upload": false,
    "swaggerDoc": "",
    "x": 160,
    "y": 80,
    "wires": [
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    "id": "20ea49d7b8584cc8",
    "type": "heap-monitor",
    "z": "34a83b3fbe73f8f8",
    "name": "memory status",
    "includeSpaces": true,
    "x": 420,
    "y": 80,
    "wires": [
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    "type": "function",
    "z": "34a83b3fbe73f8f8",
    "name": "attach retained count",
    "func": "const leak = global.get(\"heapGuardianLeak\") || [];\nmsg.payload = {\n  retainedItems: leak.length,\n  memory: msg.payload\n};\nreturn msg;",
    "outputs": 1,
    "timeout": 0,
    "noerr": 0,
    "initialize": "",
    "finalize": "",
    "libs": [],
    "x": 650,
    "y": 80,
    "wires": [
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    "type": "http response",
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    "name": "",
    "statusCode": "",
    "headers": {
      "content-type": "application/json"
    },
    "x": 870,
    "y": 80,
    "wires": []
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  {
    "id": "0d27850914b92229",
    "type": "http in",
    "z": "34a83b3fbe73f8f8",
    "name": "GET /heap-guardian/leak",
    "url": "/heap-guardian/leak",
    "method": "get",
    "upload": false,
    "swaggerDoc": "",
    "x": 150,
    "y": 160,
    "wires": [
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  {
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    "type": "function",
    "z": "34a83b3fbe73f8f8",
    "name": "retain heap objects",
    "func": "const query = (msg.req && msg.req.query) || {};\nconst requestedCount = Math.min(Math.max(Number.parseInt(query.count || \"128\", 10), 1), 5000);\nconst bytes = Math.min(Math.max(Number.parseInt(query.bytes || \"16384\", 10), 128), 1024 * 1024);\nconst maxAddedBytes = 64 * 1024 * 1024;\nconst count = Math.max(1, Math.min(requestedCount, Math.floor(maxAddedBytes / bytes)));\nconst slots = Math.max(1, Math.ceil(bytes / 8));\nconst leak = global.get(\"heapGuardianLeak\") || [];\nconst startedLength = leak.length;\n\nfor (let i = 0; i < count; i += 1) {\n  const marker = `${Date.now()}-${Math.random()}-${startedLength + i}`;\n  const values = new Array(slots);\n  for (let j = 0; j < slots; j += 1) {\n    values[j] = Math.random() + j + startedLength + i;\n  }\n  leak.push({\n    marker,\n    createdAt: new Date().toISOString(),\n    values\n  });\n}\n\nglobal.set(\"heapGuardianLeak\", leak);\nmsg.leakLab = {\n  action: \"leak\",\n  requestedItems: requestedCount,\n  addedItems: count,\n  retainedItems: leak.length,\n  requestedBytesPerItem: bytes,\n  approximateAddedBytes: count * bytes\n};\nreturn msg;",
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    "timeout": 0,
    "noerr": 0,
    "initialize": "",
    "finalize": "",
    "libs": [],
    "x": 410,
    "y": 160,
    "wires": [
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    "id": "6ce2af3dcc20cbe9",
    "type": "heap-monitor",
    "z": "34a83b3fbe73f8f8",
    "name": "after leak",
    "includeSpaces": false,
    "x": 630,
    "y": 160,
    "wires": [
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    "z": "34a83b3fbe73f8f8",
    "name": "format leak response",
    "func": "msg.payload = {\n  leak: msg.leakLab,\n  memory: msg.payload\n};\nreturn msg;",
    "outputs": 1,
    "timeout": 0,
    "noerr": 0,
    "initialize": "",
    "finalize": "",
    "libs": [],
    "x": 850,
    "y": 160,
    "wires": [
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    "name": "",
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    "headers": {
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    "x": 1070,
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    "wires": []
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    "type": "http in",
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    "name": "GET /heap-guardian/gc",
    "url": "/heap-guardian/gc",
    "method": "get",
    "upload": false,
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    "type": "gc-trigger",
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    "name": "force gc",
    "threshold": 80,
    "minInterval": 0,
    "force": true,
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    "x": 380,
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    "type": "http in",
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    "url": "/heap-guardian/clear",
    "method": "get",
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    "type": "function",
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    "name": "release retained objects",
    "func": "const leak = global.get(\"heapGuardianLeak\") || [];\nglobal.set(\"heapGuardianLeak\", []);\nmsg.leakLab = {\n  action: \"clear\",\n  clearedItems: leak.length\n};\nreturn msg;",
    "outputs": 1,
    "timeout": 0,
    "noerr": 0,
    "initialize": "",
    "finalize": "",
    "libs": [],
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    "y": 320,
    "wires": [
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    "force": true,
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    "name": "format clear response",
    "func": "msg.payload = {\n  clear: msg.leakLab,\n  gc: msg.payload\n};\nreturn msg;",
    "outputs": 1,
    "timeout": 0,
    "noerr": 0,
    "initialize": "",
    "finalize": "",
    "libs": [],
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    "y": 320,
    "wires": [
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    "type": "inject",
    "z": "34a83b3fbe73f8f8",
    "name": "manual leak 2MB",
    "props": [
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    ],
    "repeat": "",
    "crontab": "",
    "once": false,
    "onceDelay": 0.1,
    "topic": "",
    "payload": "{\"count\":128,\"bytes\":16384}",
    "payloadType": "json",
    "x": 150,
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    "name": "manual retain heap objects",
    "func": "const requestedCount = Math.min(Math.max(Number(msg.payload.count || 128), 1), 5000);\nconst bytes = Math.min(Math.max(Number(msg.payload.bytes || 16384), 128), 1024 * 1024);\nconst maxAddedBytes = 64 * 1024 * 1024;\nconst count = Math.max(1, Math.min(requestedCount, Math.floor(maxAddedBytes / bytes)));\nconst slots = Math.max(1, Math.ceil(bytes / 8));\nconst leak = global.get(\"heapGuardianLeak\") || [];\nconst startedLength = leak.length;\n\nfor (let i = 0; i < count; i += 1) {\n  const marker = `${Date.now()}-${Math.random()}-${startedLength + i}`;\n  const values = new Array(slots);\n  for (let j = 0; j < slots; j += 1) {\n    values[j] = Math.random() + j + startedLength + i;\n  }\n  leak.push({\n    marker,\n    createdAt: new Date().toISOString(),\n    values\n  });\n}\n\nglobal.set(\"heapGuardianLeak\", leak);\nmsg.payload = {\n  requestedItems: requestedCount,\n  addedItems: count,\n  retainedItems: leak.length,\n  requestedBytesPerItem: bytes,\n  approximateAddedBytes: count * bytes\n};\nreturn msg;",
    "outputs": 1,
    "timeout": 0,
    "noerr": 0,
    "initialize": "",
    "finalize": "",
    "libs": [],
    "x": 430,
    "y": 420,
    "wires": [
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    "active": true,
    "tosidebar": true,
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    "type": "inject",
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    "name": "manual clear",
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      }
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    "onceDelay": 0.1,
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    "name": "manual release retained objects",
    "func": "const leak = global.get(\"heapGuardianLeak\") || [];\nglobal.set(\"heapGuardianLeak\", []);\nmsg.payload = {\n  clearedItems: leak.length\n};\nreturn msg;",
    "outputs": 1,
    "timeout": 0,
    "noerr": 0,
    "initialize": "",
    "finalize": "",
    "libs": [],
    "x": 430,
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    "wires": [
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    "excludePattern": "^heapGuardianProfiler$",
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