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OpenTelemetry","\u002Fcompare\u002Fopentelemetry","8.compare\u002F2.opentelemetry",{"title":596,"path":597,"stem":598,"icon":572},"evlog vs LogTape","\u002Fcompare\u002Flogtape","8.compare\u002F3.logtape",{"title":600,"path":601,"stem":602,"icon":572},"evlog vs Winston: formats and request events","\u002Fcompare\u002Fwinston","8.compare\u002F4.winston",{"title":604,"path":605,"stem":606,"icon":572},"evlog vs Consola: reporters and request context","\u002Fcompare\u002Fconsola","8.compare\u002F5.consola",{"id":608,"title":609,"body":610,"description":1479,"extension":1480,"links":1481,"meta":1486,"navigation":1487,"path":412,"seo":1488,"stem":413,"__hash__":1489},"docs\u002F5.use-cases\u002F4.audit\u002F04.pipeline.md","Drains & Integrity",{"type":611,"value":612,"toc":1471},"minimark",[613,630,637,646,733,736,859,877,883,903,917,1054,1061,1113,1119,1124,1130,1187,1204,1209,1212,1287,1291,1294,1443,1449,1452,1467],[614,615,616,617,621,622,625,626,629],"p",{},"Three building blocks: ",[618,619,620],"code",{},"auditEnricher"," fills context, ",[618,623,624],{},"auditOnly"," routes audits to a dedicated drain, and ",[618,627,628],{},"signed"," adds tamper-evident integrity. Each is opt-in and replaceable.",[631,632,634],"h2",{"id":633},"auditenricher",[618,635,636],{},"auditEnricher()",[614,638,639,641,642,645],{},[618,640,636],{}," populates ",[618,643,644],{},"event.audit.context.{requestId, traceId, ip, userAgent, tenantId}",". Skip it and ship a custom enricher if your strategy differs.",[647,648,654],"pre",{"className":649,"code":650,"filename":651,"language":652,"meta":653,"style":653},"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","",[618,655,656,689,696],{"__ignoreMap":653},[657,658,661,665,669,673,676,679,682,686],"span",{"class":659,"line":660},"line",1,[657,662,664],{"class":663},"s7zQu","import",[657,666,668],{"class":667},"sMK4o"," {",[657,670,672],{"class":671},"sTEyZ"," auditEnricher",[657,674,675],{"class":667}," }",[657,677,678],{"class":663}," from",[657,680,681],{"class":667}," '",[657,683,685],{"class":684},"sfazB","evlog",[657,687,688],{"class":667},"'\n",[657,690,692],{"class":659,"line":691},2,[657,693,695],{"emptyLinePlaceholder":694},true,"\n",[657,697,699,702,705,708,710,714,717,720,723,725,728,730],{"class":659,"line":698},3,[657,700,701],{"class":671},"nitro",[657,703,704],{"class":667},".",[657,706,707],{"class":671},"hooks",[657,709,704],{"class":667},[657,711,713],{"class":712},"s2Zo4","hook",[657,715,716],{"class":671},"(",[657,718,719],{"class":667},"'",[657,721,722],{"class":684},"evlog:enrich",[657,724,719],{"class":667},[657,726,727],{"class":667},",",[657,729,672],{"class":712},[657,731,732],{"class":671},"())\n",[614,734,735],{},"For multi-tenant apps and custom session bridges, pass options:",[647,737,739],{"className":649,"code":738,"language":652,"meta":653,"style":653},"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",[618,740,741,770,814,850],{"__ignoreMap":653},[657,742,743,745,747,749,751,753,755,757,759,761,763,765,767],{"class":659,"line":660},[657,744,701],{"class":671},[657,746,704],{"class":667},[657,748,707],{"class":671},[657,750,704],{"class":667},[657,752,713],{"class":712},[657,754,716],{"class":671},[657,756,719],{"class":667},[657,758,722],{"class":684},[657,760,719],{"class":667},[657,762,727],{"class":667},[657,764,672],{"class":712},[657,766,716],{"class":671},[657,768,769],{"class":667},"{\n",[657,771,772,775,778,782,786,788,790,793,795,798,801,805,808,811],{"class":659,"line":691},[657,773,774],{"class":712},"  tenantId",[657,776,777],{"class":667},":",[657,779,781],{"class":780},"sHdIc"," ctx",[657,783,785],{"class":784},"spNyl"," =>",[657,787,781],{"class":671},[657,789,704],{"class":667},[657,791,792],{"class":671},"event",[657,794,704],{"class":667},[657,796,797],{"class":671},"tenant ",[657,799,800],{"class":663},"as",[657,802,804],{"class":803},"sBMFI"," string",[657,806,807],{"class":667}," |",[657,809,810],{"class":803}," undefined",[657,812,813],{"class":667},",\n",[657,815,816,820,822,824,827,829,832,834,836,839,842,844,847],{"class":659,"line":698},[657,817,819],{"class":818},"swJcz","  bridge",[657,821,777],{"class":667},[657,823,668],{"class":667},[657,825,826],{"class":712}," getSession",[657,828,777],{"class":667},[657,830,831],{"class":784}," async",[657,833,781],{"class":780},[657,835,785],{"class":784},[657,837,838],{"class":712}," readSessionActor",[657,840,841],{"class":671},"(ctx",[657,843,704],{"class":667},[657,845,846],{"class":671},"headers) ",[657,848,849],{"class":667},"},\n",[657,851,853,856],{"class":659,"line":852},4,[657,854,855],{"class":667},"}",[657,857,858],{"class":671},"))\n",[614,860,861,862,864,865,868,869,872,873,876],{},"Without ",[618,863,620],{},", ",[618,866,867],{},"audit.context"," stays empty, and auditors and incident responders need at least ",[618,870,871],{},"requestId"," and ",[618,874,875],{},"ip"," to triangulate a recorded action.",[631,878,880],{"id":879},"auditonly",[618,881,882],{},"auditOnly()",[884,885,886,890,891,894,895,898,899,902],"tip",{},[887,888,889],"strong",{},"Why filter audits to a separate drain?"," Three reasons: ",[887,892,893],{},"cost"," (audit volume is tiny next to product telemetry, so keep them separate and retention costs don't explode), ",[887,896,897],{},"permissions"," (the audit dataset should be read-only for engineers and write-only for the app), and ",[887,900,901],{},"retention"," (audits often live 7+ years; product logs rarely live more than 90 days).",[614,904,905,908,909,912,913,916],{},[618,906,907],{},"auditOnly(drain)"," only forwards events with an ",[618,910,911],{},"audit"," field. Compose with ",[887,914,915],{},"any"," drain:",[647,918,920],{"className":649,"code":919,"language":652,"meta":653,"style":653},"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",[618,921,922,941,961,965,971,1000,1049],{"__ignoreMap":653},[657,923,924,926,928,931,933,935,937,939],{"class":659,"line":660},[657,925,664],{"class":663},[657,927,668],{"class":667},[657,929,930],{"class":671}," auditOnly",[657,932,675],{"class":667},[657,934,678],{"class":663},[657,936,681],{"class":667},[657,938,685],{"class":684},[657,940,688],{"class":667},[657,942,943,945,947,950,952,954,956,959],{"class":659,"line":691},[657,944,664],{"class":663},[657,946,668],{"class":667},[657,948,949],{"class":671}," createAxiomDrain",[657,951,675],{"class":667},[657,953,678],{"class":663},[657,955,681],{"class":667},[657,957,958],{"class":684},"evlog\u002Faxiom",[657,960,688],{"class":667},[657,962,963],{"class":659,"line":698},[657,964,695],{"emptyLinePlaceholder":694},[657,966,967],{"class":659,"line":852},[657,968,970],{"class":969},"sHwdD","\u002F\u002F Send audits to a dedicated Axiom dataset:\n",[657,972,974,976,978,980,982,984,986,988,991,993,995,997],{"class":659,"line":973},5,[657,975,701],{"class":671},[657,977,704],{"class":667},[657,979,707],{"class":671},[657,981,704],{"class":667},[657,983,713],{"class":712},[657,985,716],{"class":671},[657,987,719],{"class":667},[657,989,990],{"class":684},"evlog:drain",[657,992,719],{"class":667},[657,994,727],{"class":667},[657,996,930],{"class":712},[657,998,999],{"class":671},"(\n",[657,1001,1003,1006,1008,1011,1014,1016,1018,1020,1022,1024,1027,1029,1032,1034,1037,1039,1042,1044,1047],{"class":659,"line":1002},6,[657,1004,1005],{"class":712},"  createAxiomDrain",[657,1007,716],{"class":671},[657,1009,1010],{"class":667},"{",[657,1012,1013],{"class":818}," dataset",[657,1015,777],{"class":667},[657,1017,681],{"class":667},[657,1019,911],{"class":684},[657,1021,719],{"class":667},[657,1023,727],{"class":667},[657,1025,1026],{"class":818}," apiKey",[657,1028,777],{"class":667},[657,1030,1031],{"class":671}," process",[657,1033,704],{"class":667},[657,1035,1036],{"class":671},"env",[657,1038,704],{"class":667},[657,1040,1041],{"class":671},"AXIOM_AUDIT_API_KEY ",[657,1043,855],{"class":667},[657,1045,1046],{"class":671},")",[657,1048,813],{"class":667},[657,1050,1052],{"class":659,"line":1051},7,[657,1053,858],{"class":671},[614,1055,1056,1057,1060],{},"Set ",[618,1058,1059],{},"await: true"," to make audit writes synchronous (no fire-and-forget for audits, so crash-safe by default):",[647,1062,1064],{"className":649,"code":1063,"language":652,"meta":653,"style":653},"auditOnly(createFsDrain({ dir: '.audit' }), { await: true })\n",[618,1065,1066],{"__ignoreMap":653},[657,1067,1068,1070,1072,1075,1077,1079,1082,1084,1086,1089,1091,1093,1095,1097,1099,1102,1104,1108,1110],{"class":659,"line":660},[657,1069,624],{"class":712},[657,1071,716],{"class":671},[657,1073,1074],{"class":712},"createFsDrain",[657,1076,716],{"class":671},[657,1078,1010],{"class":667},[657,1080,1081],{"class":818}," dir",[657,1083,777],{"class":667},[657,1085,681],{"class":667},[657,1087,1088],{"class":684},".audit",[657,1090,719],{"class":667},[657,1092,675],{"class":667},[657,1094,1046],{"class":671},[657,1096,727],{"class":667},[657,1098,668],{"class":667},[657,1100,1101],{"class":818}," await",[657,1103,777],{"class":667},[657,1105,1107],{"class":1106},"sfNiH"," true",[657,1109,675],{"class":667},[657,1111,1112],{"class":671},")\n",[614,1114,1115,1116,1118],{},"The ",[618,1117,1059],{}," flag costs you a small bit of latency per request that records an audit (one synchronous drain call), but guarantees the audit hits disk before the response is sent. For compliance-grade audits, the trade-off is always worth it.",[631,1120,1121],{"id":628},[618,1122,1123],{},"signed()",[614,1125,1126,1129],{},[618,1127,1128],{},"signed(drain, opts)"," adds tamper-evident integrity. Two strategies:",[1131,1132,1133,1149],"table",{},[1134,1135,1136],"thead",{},[1137,1138,1139,1143,1146],"tr",{},[1140,1141,1142],"th",{},"Strategy",[1140,1144,1145],{},"What it adds",[1140,1147,1148],{},"Use case",[1150,1151,1152,1169],"tbody",{},[1137,1153,1154,1160,1166],{},[1155,1156,1157],"td",{},[618,1158,1159],{},"'hmac'",[1155,1161,1162,1165],{},[618,1163,1164],{},"event.audit.signature"," (HMAC of the canonical event)",[1155,1167,1168],{},"Single-event integrity check (any later mutation fails verification).",[1137,1170,1171,1176,1184],{},[1155,1172,1173],{},[618,1174,1175],{},"'hash-chain'",[1155,1177,1178,872,1181],{},[618,1179,1180],{},"event.audit.prevHash",[618,1182,1183],{},"event.audit.hash",[1155,1185,1186],{},"A verifiable chain — deletions and reordering also become detectable.",[884,1188,1189,1195,1196,1200,1201,1203],{},[887,1190,1191,1192,1194],{},"What ",[618,1193,1123],{}," 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 ",[1197,1198,1199],"em",{},"which"," events were dropped or modified after the fact. Skip ",[618,1202,1123],{}," 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.",[1205,1206,1208],"h3",{"id":1207},"hmac","HMAC",[614,1210,1211],{},"Each event gets a signature. Tampering with one row breaks that row's verification, but doesn't break later rows.",[647,1213,1215],{"className":649,"code":1214,"language":652,"meta":653,"style":653},"import { signed } from 'evlog'\n\nsigned(drain, { strategy: 'hmac', secret: process.env.AUDIT_SECRET! })\n",[618,1216,1217,1236,1240],{"__ignoreMap":653},[657,1218,1219,1221,1223,1226,1228,1230,1232,1234],{"class":659,"line":660},[657,1220,664],{"class":663},[657,1222,668],{"class":667},[657,1224,1225],{"class":671}," signed",[657,1227,675],{"class":667},[657,1229,678],{"class":663},[657,1231,681],{"class":667},[657,1233,685],{"class":684},[657,1235,688],{"class":667},[657,1237,1238],{"class":659,"line":691},[657,1239,695],{"emptyLinePlaceholder":694},[657,1241,1242,1244,1247,1249,1251,1254,1256,1258,1260,1262,1264,1267,1269,1271,1273,1275,1277,1280,1283,1285],{"class":659,"line":698},[657,1243,628],{"class":712},[657,1245,1246],{"class":671},"(drain",[657,1248,727],{"class":667},[657,1250,668],{"class":667},[657,1252,1253],{"class":818}," strategy",[657,1255,777],{"class":667},[657,1257,681],{"class":667},[657,1259,1207],{"class":684},[657,1261,719],{"class":667},[657,1263,727],{"class":667},[657,1265,1266],{"class":818}," secret",[657,1268,777],{"class":667},[657,1270,1031],{"class":671},[657,1272,704],{"class":667},[657,1274,1036],{"class":671},[657,1276,704],{"class":667},[657,1278,1279],{"class":671},"AUDIT_SECRET",[657,1281,1282],{"class":667},"!",[657,1284,675],{"class":667},[657,1286,1112],{"class":671},[1205,1288,1290],{"id":1289},"hash-chain","Hash-chain",[614,1292,1293],{},"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.",[647,1295,1297],{"className":649,"code":1296,"language":652,"meta":653,"style":653},"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",[618,1298,1299,1310,1325,1334,1393,1432,1437],{"__ignoreMap":653},[657,1300,1301,1303,1305,1307],{"class":659,"line":660},[657,1302,628],{"class":712},[657,1304,1246],{"class":671},[657,1306,727],{"class":667},[657,1308,1309],{"class":667}," {\n",[657,1311,1312,1315,1317,1319,1321,1323],{"class":659,"line":691},[657,1313,1314],{"class":818},"  strategy",[657,1316,777],{"class":667},[657,1318,681],{"class":667},[657,1320,1289],{"class":684},[657,1322,719],{"class":667},[657,1324,813],{"class":667},[657,1326,1327,1330,1332],{"class":659,"line":698},[657,1328,1329],{"class":818},"  state",[657,1331,777],{"class":667},[657,1333,1309],{"class":667},[657,1335,1336,1339,1341,1344,1346,1349,1351,1354,1356,1358,1361,1363,1365,1367,1370,1372,1374,1376,1379,1381,1384,1386,1389,1391],{"class":659,"line":852},[657,1337,1338],{"class":712},"    load",[657,1340,777],{"class":667},[657,1342,1343],{"class":667}," ()",[657,1345,785],{"class":784},[657,1347,1348],{"class":671}," fs",[657,1350,704],{"class":667},[657,1352,1353],{"class":712},"readFile",[657,1355,716],{"class":671},[657,1357,719],{"class":667},[657,1359,1360],{"class":684},".audit\u002Fhead",[657,1362,719],{"class":667},[657,1364,727],{"class":667},[657,1366,681],{"class":667},[657,1368,1369],{"class":684},"utf8",[657,1371,719],{"class":667},[657,1373,1046],{"class":671},[657,1375,704],{"class":667},[657,1377,1378],{"class":712},"catch",[657,1380,716],{"class":671},[657,1382,1383],{"class":667},"()",[657,1385,785],{"class":784},[657,1387,1388],{"class":667}," null",[657,1390,1046],{"class":671},[657,1392,813],{"class":667},[657,1394,1395,1398,1400,1403,1406,1408,1410,1412,1414,1417,1419,1421,1423,1425,1427,1430],{"class":659,"line":973},[657,1396,1397],{"class":712},"    save",[657,1399,777],{"class":667},[657,1401,1402],{"class":667}," (",[657,1404,1405],{"class":780},"h",[657,1407,1046],{"class":667},[657,1409,785],{"class":784},[657,1411,1348],{"class":671},[657,1413,704],{"class":667},[657,1415,1416],{"class":712},"writeFile",[657,1418,716],{"class":671},[657,1420,719],{"class":667},[657,1422,1360],{"class":684},[657,1424,719],{"class":667},[657,1426,727],{"class":667},[657,1428,1429],{"class":671}," h)",[657,1431,813],{"class":667},[657,1433,1434],{"class":659,"line":1002},[657,1435,1436],{"class":667},"  },\n",[657,1438,1439,1441],{"class":659,"line":1051},[657,1440,855],{"class":667},[657,1442,1112],{"class":671},[614,1444,1115,1445,1448],{},[618,1446,1447],{},"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.",[1450,1451],"hash-chain-tamper",{},[1453,1454,1455,1456,1459,1460,1463,1464,704],"note",{},"A CLI to walk and verify the chain (",[618,1457,1458],{},"evlog audit verify",") is on the roadmap. 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