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For Nitro, register the individual hooks directly (",[451,546,547],{},"nitroApp.hooks.hook('evlog:enrich' | 'evlog:drain' | …)",[492,549,550,551,469,553,555,556,558],{},"Prefer single-purpose ",[451,552,468],{},[451,554,474],{}," wrappers for simple extensions; use ",[451,557,478],{}," only when several hooks are needed",[448,560,561,562],{},"Docs: ",[464,563,564],{"href":564,"rel":565},"https:\u002F\u002Fwww.evlog.dev\u002Fextend\u002Fplugins",[566],"nofollow",[568,569,571],"h2",{"id":570},"minimal-example","Minimal example",[573,574,579],"pre",{"className":575,"code":576,"language":577,"meta":578,"style":578},"language-ts shiki shiki-themes material-theme-lighter material-theme material-theme-palenight","import { definePlugin } from 'evlog'\n\nexport const tenantPlugin = definePlugin({\n  name: 'tenant',\n  onRequestStart({ logger, headers }) {\n    const tenantId = headers?.['x-tenant-id']\n    if (tenantId) logger.set({ tenant: { id: tenantId } })\n  },\n  enrich({ event }) {\n    event.region = process.env.REGION\n  },\n})\n","ts","",[451,580,581,613,620,645,666,691,721,771,777,792,818,823],{"__ignoreMap":578},[582,583,586,590,594,598,601,604,607,610],"span",{"class":584,"line":585},"line",1,[582,587,589],{"class":588},"s7zQu","import",[582,591,593],{"class":592},"sMK4o"," {",[582,595,597],{"class":596},"sTEyZ"," definePlugin",[582,599,600],{"class":592}," }",[582,602,603],{"class":588}," from",[582,605,606],{"class":592}," '",[582,608,500],{"class":609},"sfazB",[582,611,612],{"class":592},"'\n",[582,614,616],{"class":584,"line":615},2,[582,617,619],{"emptyLinePlaceholder":618},true,"\n",[582,621,623,626,630,633,636,639,642],{"class":584,"line":622},3,[582,624,625],{"class":588},"export",[582,627,629],{"class":628},"spNyl"," const",[582,631,632],{"class":596}," tenantPlugin ",[582,634,635],{"class":592},"=",[582,637,597],{"class":638},"s2Zo4",[582,640,641],{"class":596},"(",[582,643,644],{"class":592},"{\n",[582,646,648,652,655,657,660,663],{"class":584,"line":647},4,[582,649,651],{"class":650},"swJcz","  name",[582,653,654],{"class":592},":",[582,656,606],{"class":592},[582,658,659],{"class":609},"tenant",[582,661,662],{"class":592},"'",[582,664,665],{"class":592},",\n",[582,667,669,672,675,679,682,685,688],{"class":584,"line":668},5,[582,670,671],{"class":650},"  onRequestStart",[582,673,674],{"class":592},"({",[582,676,678],{"class":677},"sHdIc"," logger",[582,680,681],{"class":592},",",[582,683,684],{"class":677}," headers",[582,686,687],{"class":592}," })",[582,689,690],{"class":592}," {\n",[582,692,694,697,700,703,705,708,711,713,716,718],{"class":584,"line":693},6,[582,695,696],{"class":628},"    const",[582,698,699],{"class":596}," tenantId",[582,701,702],{"class":592}," =",[582,704,684],{"class":596},[582,706,707],{"class":592},"?.",[582,709,710],{"class":650},"[",[582,712,662],{"class":592},[582,714,715],{"class":609},"x-tenant-id",[582,717,662],{"class":592},[582,719,720],{"class":650},"]\n",[582,722,724,727,730,733,736,739,742,745,747,750,753,755,757,760,762,764,766,768],{"class":584,"line":723},7,[582,725,726],{"class":588},"    if",[582,728,729],{"class":650}," (",[582,731,732],{"class":596},"tenantId",[582,734,735],{"class":650},") ",[582,737,738],{"class":596},"logger",[582,740,741],{"class":592},".",[582,743,744],{"class":638},"set",[582,746,641],{"class":650},[582,748,749],{"class":592},"{",[582,751,752],{"class":650}," tenant",[582,754,654],{"class":592},[582,756,593],{"class":592},[582,758,759],{"class":650}," id",[582,761,654],{"class":592},[582,763,699],{"class":596},[582,765,600],{"class":592},[582,767,600],{"class":592},[582,769,770],{"class":650},")\n",[582,772,774],{"class":584,"line":773},8,[582,775,776],{"class":592},"  },\n",[582,778,780,783,785,788,790],{"class":584,"line":779},9,[582,781,782],{"class":650},"  enrich",[582,784,674],{"class":592},[582,786,787],{"class":677}," event",[582,789,687],{"class":592},[582,791,690],{"class":592},[582,793,795,798,800,803,805,808,810,813,815],{"class":584,"line":794},10,[582,796,797],{"class":596},"    event",[582,799,741],{"class":592},[582,801,802],{"class":596},"region",[582,804,702],{"class":592},[582,806,807],{"class":596}," process",[582,809,741],{"class":592},[582,811,812],{"class":596},"env",[582,814,741],{"class":592},[582,816,817],{"class":596},"REGION\n",[582,819,821],{"class":584,"line":820},11,[582,822,776],{"class":592},[582,824,826,829],{"class":584,"line":825},12,[582,827,828],{"class":592},"}",[582,830,770],{"class":596},[448,832,833],{},"Register the plugin where you bootstrap evlog. The shape depends on your runtime:",[835,836,837,907,985],"code-group",{},[573,838,841],{"className":575,"code":839,"filename":840,"language":577,"meta":578,"style":578},"import { initLogger } from 'evlog'\nimport { tenantPlugin } from '.\u002Fplugins\u002Ftenant'\n\ninitLogger({ plugins: [tenantPlugin] })\n","Next.js \u002F standalone",[451,842,843,862,882,886],{"__ignoreMap":578},[582,844,845,847,849,852,854,856,858,860],{"class":584,"line":585},[582,846,589],{"class":588},[582,848,593],{"class":592},[582,850,851],{"class":596}," initLogger",[582,853,600],{"class":592},[582,855,603],{"class":588},[582,857,606],{"class":592},[582,859,500],{"class":609},[582,861,612],{"class":592},[582,863,864,866,868,871,873,875,877,880],{"class":584,"line":615},[582,865,589],{"class":588},[582,867,593],{"class":592},[582,869,870],{"class":596}," tenantPlugin",[582,872,600],{"class":592},[582,874,603],{"class":588},[582,876,606],{"class":592},[582,878,879],{"class":609},".\u002Fplugins\u002Ftenant",[582,881,612],{"class":592},[582,883,884],{"class":584,"line":622},[582,885,619],{"emptyLinePlaceholder":618},[582,887,888,891,893,895,898,900,903,905],{"class":584,"line":647},[582,889,890],{"class":638},"initLogger",[582,892,641],{"class":596},[582,894,749],{"class":592},[582,896,897],{"class":650}," plugins",[582,899,654],{"class":592},[582,901,902],{"class":596}," [tenantPlugin] ",[582,904,828],{"class":592},[582,906,770],{"class":596},[573,908,911],{"className":575,"code":909,"filename":910,"language":577,"meta":578,"style":578},"import { evlogMiddleware } from 'evlog\u002F\u003Cframework>'\nimport { tenantPlugin } from '.\u002Fplugins\u002Ftenant'\n\napp.use(evlogMiddleware({ plugins: [tenantPlugin] }))\n","Hono \u002F Express \u002F Fastify \u002F Elysia",[451,912,913,933,951,955],{"__ignoreMap":578},[582,914,915,917,919,922,924,926,928,931],{"class":584,"line":585},[582,916,589],{"class":588},[582,918,593],{"class":592},[582,920,921],{"class":596}," evlogMiddleware",[582,923,600],{"class":592},[582,925,603],{"class":588},[582,927,606],{"class":592},[582,929,930],{"class":609},"evlog\u002F\u003Cframework>",[582,932,612],{"class":592},[582,934,935,937,939,941,943,945,947,949],{"class":584,"line":615},[582,936,589],{"class":588},[582,938,593],{"class":592},[582,940,870],{"class":596},[582,942,600],{"class":592},[582,944,603],{"class":588},[582,946,606],{"class":592},[582,948,879],{"class":609},[582,950,612],{"class":592},[582,952,953],{"class":584,"line":622},[582,954,619],{"emptyLinePlaceholder":618},[582,956,957,960,962,965,967,970,972,974,976,978,980,982],{"class":584,"line":647},[582,958,959],{"class":596},"app",[582,961,741],{"class":592},[582,963,964],{"class":638},"use",[582,966,641],{"class":596},[582,968,969],{"class":638},"evlogMiddleware",[582,971,641],{"class":596},[582,973,749],{"class":592},[582,975,897],{"class":650},[582,977,654],{"class":592},[582,979,902],{"class":596},[582,981,828],{"class":592},[582,983,984],{"class":596},"))\n",[573,986,988],{"className":575,"code":987,"filename":182,"language":577,"meta":578,"style":578},"\u002F\u002F Register the hooks you actually use directly:\nnitroApp.hooks.hook('evlog:enrich', tenantPlugin.enrich!)\nnitroApp.hooks.hook('evlog:request:start', tenantPlugin.onRequestStart!)\n",[451,989,990,996,1033],{"__ignoreMap":578},[582,991,992],{"class":584,"line":585},[582,993,995],{"class":994},"sHwdD","\u002F\u002F Register the hooks you actually use directly:\n",[582,997,998,1001,1003,1006,1008,1011,1013,1015,1018,1020,1022,1024,1026,1028,1031],{"class":584,"line":615},[582,999,1000],{"class":596},"nitroApp",[582,1002,741],{"class":592},[582,1004,1005],{"class":596},"hooks",[582,1007,741],{"class":592},[582,1009,1010],{"class":638},"hook",[582,1012,641],{"class":596},[582,1014,662],{"class":592},[582,1016,1017],{"class":609},"evlog:enrich",[582,1019,662],{"class":592},[582,1021,681],{"class":592},[582,1023,870],{"class":596},[582,1025,741],{"class":592},[582,1027,508],{"class":596},[582,1029,1030],{"class":592},"!",[582,1032,770],{"class":596},[582,1034,1035,1037,1039,1041,1043,1045,1047,1049,1052,1054,1056,1058,1060,1062,1064],{"class":584,"line":622},[582,1036,1000],{"class":596},[582,1038,741],{"class":592},[582,1040,1005],{"class":596},[582,1042,741],{"class":592},[582,1044,1010],{"class":638},[582,1046,641],{"class":596},[582,1048,662],{"class":592},[582,1050,1051],{"class":609},"evlog:request:start",[582,1053,662],{"class":592},[582,1055,681],{"class":592},[582,1057,870],{"class":596},[582,1059,741],{"class":592},[582,1061,504],{"class":596},[582,1063,1030],{"class":592},[582,1065,770],{"class":596},[568,1067,1068],{"id":1005},"Hooks",[1070,1071,1072,1088],"table",{},[1073,1074,1075],"thead",{},[1076,1077,1078,1082,1085],"tr",{},[1079,1080,1081],"th",{},"Hook",[1079,1083,1084],{},"When",[1079,1086,1087],{},"Use it for",[1089,1090,1091,1108,1123,1136,1156,1169,1182,1195],"tbody",{},[1076,1092,1093,1099,1102],{},[1094,1095,1096],"td",{},[451,1097,1098],{},"setup(ctx)",[1094,1100,1101],{},"Once when registered",[1094,1103,1104,1105,1107],{},"Read ",[451,1106,812],{},", set up shared state",[1076,1109,1110,1115,1118],{},[1094,1111,1112],{},[451,1113,1114],{},"onRequestStart(ctx)",[1094,1116,1117],{},"Each request, before any handler runs",[1094,1119,1120,1121],{},"Pull values from headers into ",[451,1122,738],{},[1076,1124,1125,1130,1133],{},[1094,1126,1127],{},[451,1128,1129],{},"enrich(ctx)",[1094,1131,1132],{},"Every event, before drain",[1094,1134,1135],{},"Add derived fields (geo, deploy id…)",[1076,1137,1138,1143,1146],{},[1094,1139,1140],{},[451,1141,1142],{},"keep(ctx)",[1094,1144,1145],{},"Tail sampling decision",[1094,1147,1148,1149,505,1152,1155],{},"Force-keep based on outcome (",[451,1150,1151],{},"status >= 400",[451,1153,1154],{},"duration > 500",", …)",[1076,1157,1158,1163,1166],{},[1094,1159,1160],{},[451,1161,1162],{},"drain(ctx)",[1094,1164,1165],{},"Every emitted event",[1094,1167,1168],{},"Side-effect: alert, mirror to a queue, etc.",[1076,1170,1171,1176,1179],{},[1094,1172,1173],{},[451,1174,1175],{},"onRequestFinish(ctx)",[1094,1177,1178],{},"After response",[1094,1180,1181],{},"Per-request post-processing",[1076,1183,1184,1189,1192],{},[1094,1185,1186],{},[451,1187,1188],{},"onClientLog(ctx)",[1094,1190,1191],{},"Browser-submitted event hits the ingest endpoint",[1094,1193,1194],{},"Observe \u002F reject client traffic",[1076,1196,1197,1202,1205],{},[1094,1198,1199],{},[451,1200,1201],{},"extendLogger(logger)",[1094,1203,1204],{},"Each request",[1094,1206,1207,1208,524],{},"Add custom methods (e.g. ",[451,1209,1210],{},"logger.audit.refund()",[448,1212,1213,1214,1217,1218,741],{},"Every hook is ",[456,1215,1216],{},"optional",". A plugin can implement any subset. The full type lives in ",[464,1219,1222],{"href":1220,"rel":1221},"https:\u002F\u002Fgithub.com\u002FHugoRCD\u002Fevlog\u002Fblob\u002Fmain\u002Fpackages\u002Fevlog\u002Fsrc\u002Fshared\u002Fplugin.ts",[566],[451,1223,1224],{},"packages\u002Fevlog\u002Fsrc\u002Fshared\u002Fplugin.ts",[568,1226,1228],{"id":1227},"a-multi-hook-example","A multi-hook example",[448,1230,1231,1232,1235,1236,505,1239,1241,1242,654],{},"Plugins shine when several concerns share state. Here, a single ",[451,1233,1234],{},"request-metrics"," plugin tracks per-request timing through ",[451,1237,1238],{},"setup",[451,1240,504],{},", and ",[451,1243,511],{},[573,1245,1247],{"className":575,"code":1246,"language":577,"meta":578,"style":578},"import { definePlugin } from 'evlog\u002Ftoolkit'\n\nexport const requestMetricsPlugin = definePlugin({\n  name: 'request-metrics',\n\n  setup({ env }) {\n    statsd.init({ service: env.service })\n  },\n\n  enrich({ event }) {\n    event.tier = event.duration && event.duration > 1000 ? 'slow' : 'fast'\n  },\n\n  drain({ event }) {\n    statsd.timing('http.request', event.duration as number, { path: event.path as string })\n  },\n\n  onRequestStart({ logger, request }) {\n    logger.set({ trace: { startedAt: Date.now() } })\n  },\n\n  onRequestFinish({ event, durationMs }) {\n    if (event && (event.level === 'error' || durationMs > 5000)) {\n      \u002F\u002F alert \u002F forward \u002F etc.\n    }\n  },\n})\n",[451,1248,1249,1268,1272,1289,1303,1307,1321,1351,1355,1359,1371,1425,1429,1434,1448,1507,1512,1517,1535,1578,1583,1588,1607,1653,1659,1665,1670],{"__ignoreMap":578},[582,1250,1251,1253,1255,1257,1259,1261,1263,1266],{"class":584,"line":585},[582,1252,589],{"class":588},[582,1254,593],{"class":592},[582,1256,597],{"class":596},[582,1258,600],{"class":592},[582,1260,603],{"class":588},[582,1262,606],{"class":592},[582,1264,1265],{"class":609},"evlog\u002Ftoolkit",[582,1267,612],{"class":592},[582,1269,1270],{"class":584,"line":615},[582,1271,619],{"emptyLinePlaceholder":618},[582,1273,1274,1276,1278,1281,1283,1285,1287],{"class":584,"line":622},[582,1275,625],{"class":588},[582,1277,629],{"class":628},[582,1279,1280],{"class":596}," requestMetricsPlugin ",[582,1282,635],{"class":592},[582,1284,597],{"class":638},[582,1286,641],{"class":596},[582,1288,644],{"class":592},[582,1290,1291,1293,1295,1297,1299,1301],{"class":584,"line":647},[582,1292,651],{"class":650},[582,1294,654],{"class":592},[582,1296,606],{"class":592},[582,1298,1234],{"class":609},[582,1300,662],{"class":592},[582,1302,665],{"class":592},[582,1304,1305],{"class":584,"line":668},[582,1306,619],{"emptyLinePlaceholder":618},[582,1308,1309,1312,1314,1317,1319],{"class":584,"line":693},[582,1310,1311],{"class":650},"  setup",[582,1313,674],{"class":592},[582,1315,1316],{"class":677}," env",[582,1318,687],{"class":592},[582,1320,690],{"class":592},[582,1322,1323,1326,1328,1331,1333,1335,1338,1340,1342,1344,1347,1349],{"class":584,"line":723},[582,1324,1325],{"class":596},"    statsd",[582,1327,741],{"class":592},[582,1329,1330],{"class":638},"init",[582,1332,641],{"class":650},[582,1334,749],{"class":592},[582,1336,1337],{"class":650}," 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Re-registering with the same ",[451,1847,1844],{}," replaces the previous version (last registration wins).",[568,1850,1852],{"id":1851},"next-steps","Next steps",[489,1854,1855,1861,1867,1873],{},[492,1856,1857,1860],{},[464,1858,1859],{"href":387},"Custom Enrichers"," — single-hook enrichment",[492,1862,1863,1866],{},[464,1864,1865],{"href":400},"Custom Drains"," — single-destination output",[492,1868,1869,1872],{},[464,1870,1871],{"href":391},"Tail Sampling"," — outcome-aware keep decisions",[492,1874,1875,1878],{},[464,1876,1877],{"href":395},"Identity Headers"," — tag every drain request",[1880,1881,1882],"style",{},"html pre.shiki code .s7zQu, html code.shiki .s7zQu{--shiki-light:#39ADB5;--shiki-light-font-style:italic;--shiki-default:#89DDFF;--shiki-default-font-style:italic;--shiki-dark:#89DDFF;--shiki-dark-font-style:italic}html pre.shiki code .sMK4o, html code.shiki .sMK4o{--shiki-light:#39ADB5;--shiki-default:#89DDFF;--shiki-dark:#89DDFF}html pre.shiki code .sTEyZ, html code.shiki .sTEyZ{--shiki-light:#90A4AE;--shiki-default:#EEFFFF;--shiki-dark:#BABED8}html pre.shiki code .sfazB, html code.shiki .sfazB{--shiki-light:#91B859;--shiki-default:#C3E88D;--shiki-dark:#C3E88D}html pre.shiki code .spNyl, html code.shiki .spNyl{--shiki-light:#9C3EDA;--shiki-default:#C792EA;--shiki-dark:#C792EA}html pre.shiki code .s2Zo4, html code.shiki .s2Zo4{--shiki-light:#6182B8;--shiki-default:#82AAFF;--shiki-dark:#82AAFF}html pre.shiki code .swJcz, html code.shiki .swJcz{--shiki-light:#E53935;--shiki-default:#F07178;--shiki-dark:#F07178}html pre.shiki code .sHdIc, html code.shiki .sHdIc{--shiki-light:#90A4AE;--shiki-light-font-style:italic;--shiki-default:#EEFFFF;--shiki-default-font-style:italic;--shiki-dark:#BABED8;--shiki-dark-font-style:italic}html .light .shiki span {color: var(--shiki-light);background: var(--shiki-light-bg);font-style: var(--shiki-light-font-style);font-weight: var(--shiki-light-font-weight);text-decoration: var(--shiki-light-text-decoration);}html.light .shiki span {color: var(--shiki-light);background: var(--shiki-light-bg);font-style: var(--shiki-light-font-style);font-weight: var(--shiki-light-font-weight);text-decoration: var(--shiki-light-text-decoration);}html .default .shiki span {color: var(--shiki-default);background: var(--shiki-default-bg);font-style: var(--shiki-default-font-style);font-weight: var(--shiki-default-font-weight);text-decoration: var(--shiki-default-text-decoration);}html .shiki span {color: var(--shiki-default);background: var(--shiki-default-bg);font-style: var(--shiki-default-font-style);font-weight: var(--shiki-default-font-weight);text-decoration: var(--shiki-default-text-decoration);}html .dark .shiki span {color: var(--shiki-dark);background: var(--shiki-dark-bg);font-style: var(--shiki-dark-font-style);font-weight: var(--shiki-dark-font-weight);text-decoration: var(--shiki-dark-text-decoration);}html.dark .shiki span {color: var(--shiki-dark);background: var(--shiki-dark-bg);font-style: var(--shiki-dark-font-style);font-weight: var(--shiki-dark-font-weight);text-decoration: var(--shiki-dark-text-decoration);}html pre.shiki code .sHwdD, html code.shiki .sHwdD{--shiki-light:#90A4AE;--shiki-light-font-style:italic;--shiki-default:#546E7A;--shiki-default-font-style:italic;--shiki-dark:#676E95;--shiki-dark-font-style:italic}html pre.shiki code .sbssI, html code.shiki .sbssI{--shiki-light:#F76D47;--shiki-default:#F78C6C;--shiki-dark:#F78C6C}html pre.shiki code .sBMFI, html code.shiki .sBMFI{--shiki-light:#E2931D;--shiki-default:#FFCB6B;--shiki-dark:#FFCB6B}",{"title":578,"searchDepth":615,"depth":615,"links":1884},[1885,1886,1887,1888,1889,1890],{"id":570,"depth":615,"text":571},{"id":1005,"depth":615,"text":1068},{"id":1227,"depth":615,"text":1228},{"id":1679,"depth":615,"text":1680},{"id":1790,"depth":615,"text":1791},{"id":1851,"depth":615,"text":1852},"definePlugin is the canonical extension point for evlog — opt into any subset of setup, onRequestStart, enrich, keep, drain, onRequestFinish, onClientLog, extendLogger from a single cohesive object.","md",[1894,1897,1898],{"label":1859,"icon":352,"to":387,"color":1895,"variant":1896},"neutral","subtle",{"label":1865,"icon":402,"to":400,"color":1895,"variant":1896},{"label":1871,"icon":64,"to":391,"color":1895,"variant":1896},{},{"title":382,"icon":361},{"title":382,"description":1891},"V3Y6XFn7kEOgKHMLccUovjvoyQKjlGwzZq4KTU0kfxo",[1904,1906],{"title":345,"path":378,"stem":379,"description":1905,"icon":380,"children":-1},"Concrete copy-paste recipes — build your own minimal devtool, pipe to curl + jq, replay history then go live, and aggregate on the consumer side.",{"title":386,"path":387,"stem":388,"description":1907,"icon":352,"children":-1},"Write custom enrichers to add derived context to your wide events. Add deployment metadata, tenant IDs, feature flags, geo, or any computed data — the toolkit handles error isolation, undefined skipping, and the merge step.",1779694503929]