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OpenTelemetry","\u002Fcompare\u002Fopentelemetry","8.compare\u002F2.opentelemetry",{"title":601,"path":602,"stem":603,"icon":577},"evlog vs LogTape","\u002Fcompare\u002Flogtape","8.compare\u002F3.logtape",{"title":605,"path":606,"stem":607,"icon":577},"evlog vs Winston: formats and request events","\u002Fcompare\u002Fwinston","8.compare\u002F4.winston",{"title":609,"path":610,"stem":611,"icon":577},"evlog vs Consola: reporters and request context","\u002Fcompare\u002Fconsola","8.compare\u002F5.consola",{"id":613,"title":614,"body":615,"description":1496,"extension":1497,"links":1498,"meta":1503,"navigation":1504,"path":417,"seo":1505,"stem":418,"__hash__":1506},"docs\u002F5.use-cases\u002F4.audit\u002F04.pipeline.md","Drains & Integrity",{"type":616,"value":617,"toc":1488},"minimark",[618,635,642,651,738,741,864,882,888,908,922,1059,1066,1118,1136,1141,1147,1204,1221,1226,1229,1304,1308,1311,1460,1466,1469,1484],[619,620,621,622,626,627,630,631,634],"p",{},"Three building blocks: ",[623,624,625],"code",{},"auditEnricher"," fills context, ",[623,628,629],{},"auditOnly"," routes audits to a dedicated drain, and ",[623,632,633],{},"signed"," adds tamper-evident integrity. Each is opt-in and replaceable.",[636,637,639],"h2",{"id":638},"auditenricher",[623,640,641],{},"auditEnricher()",[619,643,644,646,647,650],{},[623,645,641],{}," populates ",[623,648,649],{},"event.audit.context.{requestId, traceId, ip, userAgent, tenantId}",". Skip it and ship a custom enricher if your strategy differs.",[652,653,659],"pre",{"className":654,"code":655,"filename":656,"language":657,"meta":658,"style":658},"language-typescript shiki shiki-themes material-theme-lighter material-theme material-theme-palenight","import { auditEnricher } from 'evlog'\n\nnitro.hooks.hook('evlog:enrich', auditEnricher())\n","server\u002Fplugins\u002Fevlog.ts","typescript","",[623,660,661,694,701],{"__ignoreMap":658},[662,663,666,670,674,678,681,684,687,691],"span",{"class":664,"line":665},"line",1,[662,667,669],{"class":668},"s7zQu","import",[662,671,673],{"class":672},"sMK4o"," {",[662,675,677],{"class":676},"sTEyZ"," auditEnricher",[662,679,680],{"class":672}," }",[662,682,683],{"class":668}," from",[662,685,686],{"class":672}," '",[662,688,690],{"class":689},"sfazB","evlog",[662,692,693],{"class":672},"'\n",[662,695,697],{"class":664,"line":696},2,[662,698,700],{"emptyLinePlaceholder":699},true,"\n",[662,702,704,707,710,713,715,719,722,725,728,730,733,735],{"class":664,"line":703},3,[662,705,706],{"class":676},"nitro",[662,708,709],{"class":672},".",[662,711,712],{"class":676},"hooks",[662,714,709],{"class":672},[662,716,718],{"class":717},"s2Zo4","hook",[662,720,721],{"class":676},"(",[662,723,724],{"class":672},"'",[662,726,727],{"class":689},"evlog:enrich",[662,729,724],{"class":672},[662,731,732],{"class":672},",",[662,734,677],{"class":717},[662,736,737],{"class":676},"())\n",[619,739,740],{},"For multi-tenant apps and custom session bridges, pass options:",[652,742,744],{"className":654,"code":743,"language":657,"meta":658,"style":658},"nitro.hooks.hook('evlog:enrich', auditEnricher({\n  tenantId: ctx => ctx.event.tenant as string | undefined,\n  bridge: { getSession: async ctx => readSessionActor(ctx.headers) },\n}))\n",[623,745,746,775,819,855],{"__ignoreMap":658},[662,747,748,750,752,754,756,758,760,762,764,766,768,770,772],{"class":664,"line":665},[662,749,706],{"class":676},[662,751,709],{"class":672},[662,753,712],{"class":676},[662,755,709],{"class":672},[662,757,718],{"class":717},[662,759,721],{"class":676},[662,761,724],{"class":672},[662,763,727],{"class":689},[662,765,724],{"class":672},[662,767,732],{"class":672},[662,769,677],{"class":717},[662,771,721],{"class":676},[662,773,774],{"class":672},"{\n",[662,776,777,780,783,787,791,793,795,798,800,803,806,810,813,816],{"class":664,"line":696},[662,778,779],{"class":717},"  tenantId",[662,781,782],{"class":672},":",[662,784,786],{"class":785},"sHdIc"," ctx",[662,788,790],{"class":789},"spNyl"," =>",[662,792,786],{"class":676},[662,794,709],{"class":672},[662,796,797],{"class":676},"event",[662,799,709],{"class":672},[662,801,802],{"class":676},"tenant ",[662,804,805],{"class":668},"as",[662,807,809],{"class":808},"sBMFI"," string",[662,811,812],{"class":672}," |",[662,814,815],{"class":808}," undefined",[662,817,818],{"class":672},",\n",[662,820,821,825,827,829,832,834,837,839,841,844,847,849,852],{"class":664,"line":703},[662,822,824],{"class":823},"swJcz","  bridge",[662,826,782],{"class":672},[662,828,673],{"class":672},[662,830,831],{"class":717}," getSession",[662,833,782],{"class":672},[662,835,836],{"class":789}," async",[662,838,786],{"class":785},[662,840,790],{"class":789},[662,842,843],{"class":717}," readSessionActor",[662,845,846],{"class":676},"(ctx",[662,848,709],{"class":672},[662,850,851],{"class":676},"headers) ",[662,853,854],{"class":672},"},\n",[662,856,858,861],{"class":664,"line":857},4,[662,859,860],{"class":672},"}",[662,862,863],{"class":676},"))\n",[619,865,866,867,869,870,873,874,877,878,881],{},"Without ",[623,868,625],{},", ",[623,871,872],{},"audit.context"," stays empty, and auditors and incident responders need at least ",[623,875,876],{},"requestId"," and ",[623,879,880],{},"ip"," to triangulate a recorded action.",[636,883,885],{"id":884},"auditonly",[623,886,887],{},"auditOnly()",[889,890,891,895,896,899,900,903,904,907],"tip",{},[892,893,894],"strong",{},"Why filter audits to a separate drain?"," Three reasons: ",[892,897,898],{},"cost"," (audit volume is tiny next to product telemetry, so keep them separate and retention costs don't explode), ",[892,901,902],{},"permissions"," (the audit dataset should be read-only for engineers and write-only for the app), and ",[892,905,906],{},"retention"," (audits often live 7+ years; product logs rarely live more than 90 days).",[619,909,910,913,914,917,918,921],{},[623,911,912],{},"auditOnly(drain)"," only forwards events with an ",[623,915,916],{},"audit"," field. Compose with ",[892,919,920],{},"any"," drain:",[652,923,925],{"className":654,"code":924,"language":657,"meta":658,"style":658},"import { auditOnly } from 'evlog'\nimport { createAxiomDrain } from 'evlog\u002Faxiom'\n\n\u002F\u002F Send audits to a dedicated Axiom dataset:\nnitro.hooks.hook('evlog:drain', auditOnly(\n  createAxiomDrain({ dataset: 'audit', apiKey: process.env.AXIOM_AUDIT_API_KEY }),\n))\n",[623,926,927,946,966,970,976,1005,1054],{"__ignoreMap":658},[662,928,929,931,933,936,938,940,942,944],{"class":664,"line":665},[662,930,669],{"class":668},[662,932,673],{"class":672},[662,934,935],{"class":676}," auditOnly",[662,937,680],{"class":672},[662,939,683],{"class":668},[662,941,686],{"class":672},[662,943,690],{"class":689},[662,945,693],{"class":672},[662,947,948,950,952,955,957,959,961,964],{"class":664,"line":696},[662,949,669],{"class":668},[662,951,673],{"class":672},[662,953,954],{"class":676}," createAxiomDrain",[662,956,680],{"class":672},[662,958,683],{"class":668},[662,960,686],{"class":672},[662,962,963],{"class":689},"evlog\u002Faxiom",[662,965,693],{"class":672},[662,967,968],{"class":664,"line":703},[662,969,700],{"emptyLinePlaceholder":699},[662,971,972],{"class":664,"line":857},[662,973,975],{"class":974},"sHwdD","\u002F\u002F Send audits to a dedicated Axiom dataset:\n",[662,977,979,981,983,985,987,989,991,993,996,998,1000,1002],{"class":664,"line":978},5,[662,980,706],{"class":676},[662,982,709],{"class":672},[662,984,712],{"class":676},[662,986,709],{"class":672},[662,988,718],{"class":717},[662,990,721],{"class":676},[662,992,724],{"class":672},[662,994,995],{"class":689},"evlog:drain",[662,997,724],{"class":672},[662,999,732],{"class":672},[662,1001,935],{"class":717},[662,1003,1004],{"class":676},"(\n",[662,1006,1008,1011,1013,1016,1019,1021,1023,1025,1027,1029,1032,1034,1037,1039,1042,1044,1047,1049,1052],{"class":664,"line":1007},6,[662,1009,1010],{"class":717},"  createAxiomDrain",[662,1012,721],{"class":676},[662,1014,1015],{"class":672},"{",[662,1017,1018],{"class":823}," dataset",[662,1020,782],{"class":672},[662,1022,686],{"class":672},[662,1024,916],{"class":689},[662,1026,724],{"class":672},[662,1028,732],{"class":672},[662,1030,1031],{"class":823}," apiKey",[662,1033,782],{"class":672},[662,1035,1036],{"class":676}," process",[662,1038,709],{"class":672},[662,1040,1041],{"class":676},"env",[662,1043,709],{"class":672},[662,1045,1046],{"class":676},"AXIOM_AUDIT_API_KEY ",[662,1048,860],{"class":672},[662,1050,1051],{"class":676},")",[662,1053,818],{"class":672},[662,1055,1057],{"class":664,"line":1056},7,[662,1058,863],{"class":676},[619,1060,1061,1062,1065],{},"Set ",[623,1063,1064],{},"await: true"," to make audit writes synchronous (no fire-and-forget for audits, so crash-safe by default):",[652,1067,1069],{"className":654,"code":1068,"language":657,"meta":658,"style":658},"auditOnly(createFsDrain({ dir: '.audit' }), { await: true })\n",[623,1070,1071],{"__ignoreMap":658},[662,1072,1073,1075,1077,1080,1082,1084,1087,1089,1091,1094,1096,1098,1100,1102,1104,1107,1109,1113,1115],{"class":664,"line":665},[662,1074,629],{"class":717},[662,1076,721],{"class":676},[662,1078,1079],{"class":717},"createFsDrain",[662,1081,721],{"class":676},[662,1083,1015],{"class":672},[662,1085,1086],{"class":823}," dir",[662,1088,782],{"class":672},[662,1090,686],{"class":672},[662,1092,1093],{"class":689},".audit",[662,1095,724],{"class":672},[662,1097,680],{"class":672},[662,1099,1051],{"class":676},[662,1101,732],{"class":672},[662,1103,673],{"class":672},[662,1105,1106],{"class":823}," await",[662,1108,782],{"class":672},[662,1110,1112],{"class":1111},"sfNiH"," true",[662,1114,680],{"class":672},[662,1116,1117],{"class":676},")\n",[619,1119,1120,1121,1123,1124,1127,1128,1131,1132,1135],{},"The ",[623,1122,1064],{}," flag costs one awaited drain call per request that records an audit: the drain step that carries the audit finishes only once the write is done, instead of firing it and moving on. With ",[623,1125,1126],{},"waitUntil"," set (Next.js, Cloudflare Workers, Vercel Edge), that step runs after the response and the runtime stays alive until the write lands. An audit recorded inside ",[623,1129,1130],{},"log.fork()"," is drained by the child, so ",[623,1133,1134],{},"await log.fork(...)"," when the write must land before the handler returns. For compliance-grade audits, the trade-off is always worth it.",[636,1137,1138],{"id":633},[623,1139,1140],{},"signed()",[619,1142,1143,1146],{},[623,1144,1145],{},"signed(drain, opts)"," adds tamper-evident integrity. Two strategies:",[1148,1149,1150,1166],"table",{},[1151,1152,1153],"thead",{},[1154,1155,1156,1160,1163],"tr",{},[1157,1158,1159],"th",{},"Strategy",[1157,1161,1162],{},"What it adds",[1157,1164,1165],{},"Use case",[1167,1168,1169,1186],"tbody",{},[1154,1170,1171,1177,1183],{},[1172,1173,1174],"td",{},[623,1175,1176],{},"'hmac'",[1172,1178,1179,1182],{},[623,1180,1181],{},"event.audit.signature"," (HMAC of the canonical event)",[1172,1184,1185],{},"Single-event integrity check (any later mutation fails verification).",[1154,1187,1188,1193,1201],{},[1172,1189,1190],{},[623,1191,1192],{},"'hash-chain'",[1172,1194,1195,877,1198],{},[623,1196,1197],{},"event.audit.prevHash",[623,1199,1200],{},"event.audit.hash",[1172,1202,1203],{},"A verifiable chain — deletions and reordering also become detectable.",[889,1205,1206,1212,1213,1217,1218,1220],{},[892,1207,1208,1209,1211],{},"What ",[623,1210,1140],{}," actually buys you."," Detection, not prevention. Anyone with write access to the underlying drain can still nuke the file or table, but the chain proves ",[1214,1215,1216],"em",{},"which"," events were dropped or modified after the fact. Skip ",[623,1219,1140],{}," if you already write to an append-only \u002F WORM store (S3 Object Lock, Postgres with row-level immutability, BigQuery append-only tables); doubling integrity layers just adds latency without raising the bar.",[1222,1223,1225],"h3",{"id":1224},"hmac","HMAC",[619,1227,1228],{},"Each event gets a signature. Tampering with one row breaks that row's verification, but doesn't break later rows.",[652,1230,1232],{"className":654,"code":1231,"language":657,"meta":658,"style":658},"import { signed } from 'evlog'\n\nsigned(drain, { strategy: 'hmac', secret: process.env.AUDIT_SECRET! })\n",[623,1233,1234,1253,1257],{"__ignoreMap":658},[662,1235,1236,1238,1240,1243,1245,1247,1249,1251],{"class":664,"line":665},[662,1237,669],{"class":668},[662,1239,673],{"class":672},[662,1241,1242],{"class":676}," signed",[662,1244,680],{"class":672},[662,1246,683],{"class":668},[662,1248,686],{"class":672},[662,1250,690],{"class":689},[662,1252,693],{"class":672},[662,1254,1255],{"class":664,"line":696},[662,1256,700],{"emptyLinePlaceholder":699},[662,1258,1259,1261,1264,1266,1268,1271,1273,1275,1277,1279,1281,1284,1286,1288,1290,1292,1294,1297,1300,1302],{"class":664,"line":703},[662,1260,633],{"class":717},[662,1262,1263],{"class":676},"(drain",[662,1265,732],{"class":672},[662,1267,673],{"class":672},[662,1269,1270],{"class":823}," strategy",[662,1272,782],{"class":672},[662,1274,686],{"class":672},[662,1276,1224],{"class":689},[662,1278,724],{"class":672},[662,1280,732],{"class":672},[662,1282,1283],{"class":823}," secret",[662,1285,782],{"class":672},[662,1287,1036],{"class":676},[662,1289,709],{"class":672},[662,1291,1041],{"class":676},[662,1293,709],{"class":672},[662,1295,1296],{"class":676},"AUDIT_SECRET",[662,1298,1299],{"class":672},"!",[662,1301,680],{"class":672},[662,1303,1117],{"class":676},[1222,1305,1307],{"id":1306},"hash-chain","Hash-chain",[619,1309,1310],{},"Each event references the previous event's hash. Deleting any row breaks the chain forward of that point, so the verifier can pinpoint the exact row that was tampered with.",[652,1312,1314],{"className":654,"code":1313,"language":657,"meta":658,"style":658},"signed(drain, {\n  strategy: 'hash-chain',\n  state: {\n    load: () => fs.readFile('.audit\u002Fhead', 'utf8').catch(() => null),\n    save: (h) => fs.writeFile('.audit\u002Fhead', h),\n  },\n})\n",[623,1315,1316,1327,1342,1351,1410,1449,1454],{"__ignoreMap":658},[662,1317,1318,1320,1322,1324],{"class":664,"line":665},[662,1319,633],{"class":717},[662,1321,1263],{"class":676},[662,1323,732],{"class":672},[662,1325,1326],{"class":672}," {\n",[662,1328,1329,1332,1334,1336,1338,1340],{"class":664,"line":696},[662,1330,1331],{"class":823},"  strategy",[662,1333,782],{"class":672},[662,1335,686],{"class":672},[662,1337,1306],{"class":689},[662,1339,724],{"class":672},[662,1341,818],{"class":672},[662,1343,1344,1347,1349],{"class":664,"line":703},[662,1345,1346],{"class":823},"  state",[662,1348,782],{"class":672},[662,1350,1326],{"class":672},[662,1352,1353,1356,1358,1361,1363,1366,1368,1371,1373,1375,1378,1380,1382,1384,1387,1389,1391,1393,1396,1398,1401,1403,1406,1408],{"class":664,"line":857},[662,1354,1355],{"class":717},"    load",[662,1357,782],{"class":672},[662,1359,1360],{"class":672}," ()",[662,1362,790],{"class":789},[662,1364,1365],{"class":676}," fs",[662,1367,709],{"class":672},[662,1369,1370],{"class":717},"readFile",[662,1372,721],{"class":676},[662,1374,724],{"class":672},[662,1376,1377],{"class":689},".audit\u002Fhead",[662,1379,724],{"class":672},[662,1381,732],{"class":672},[662,1383,686],{"class":672},[662,1385,1386],{"class":689},"utf8",[662,1388,724],{"class":672},[662,1390,1051],{"class":676},[662,1392,709],{"class":672},[662,1394,1395],{"class":717},"catch",[662,1397,721],{"class":676},[662,1399,1400],{"class":672},"()",[662,1402,790],{"class":789},[662,1404,1405],{"class":672}," null",[662,1407,1051],{"class":676},[662,1409,818],{"class":672},[662,1411,1412,1415,1417,1420,1423,1425,1427,1429,1431,1434,1436,1438,1440,1442,1444,1447],{"class":664,"line":978},[662,1413,1414],{"class":717},"    save",[662,1416,782],{"class":672},[662,1418,1419],{"class":672}," (",[662,1421,1422],{"class":785},"h",[662,1424,1051],{"class":672},[662,1426,790],{"class":789},[662,1428,1365],{"class":676},[662,1430,709],{"class":672},[662,1432,1433],{"class":717},"writeFile",[662,1435,721],{"class":676},[662,1437,724],{"class":672},[662,1439,1377],{"class":689},[662,1441,724],{"class":672},[662,1443,732],{"class":672},[662,1445,1446],{"class":676}," h)",[662,1448,818],{"class":672},[662,1450,1451],{"class":664,"line":1007},[662,1452,1453],{"class":672},"  },\n",[662,1455,1456,1458],{"class":664,"line":1056},[662,1457,860],{"class":672},[662,1459,1117],{"class":676},[619,1461,1120,1462,1465],{},[623,1463,1464],{},"state"," config is required for cross-process or durable chains: load the previous head hash from your own store (Redis, Postgres, file) before each event, save the new head after.",[1467,1468],"hash-chain-tamper",{},[1470,1471,1472,1473,1476,1477,1480,1481,709],"note",{},"A CLI to walk and verify the chain (",[623,1474,1475],{},"evlog audit verify",") is on the roadmap. 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