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It's how you keep all errors and slow requests while throwing away the bulk of healthy traffic, the opposite of head sampling, which decides up front before knowing what happens.",[608,620,621,622,626,627,630,631,634,635,638],{},"The full theory and config reference, covering built-in ",[623,624,625],"code",{},"keep"," rules, custom predicates via ",[623,628,629],{},"evlog:emit:keep",", combining head + tail sampling, lives at ",[632,633,66],"a",{"href":67},". This page covers the ",[611,636,637],{},"extension surface",": how to plug your own keep logic into the pipeline.",[640,641,644,647,691],"prompt",{":actions":642,"description":643,"icon":69},"[\"copy\",\"cursor\",\"claude\"]","Configure tail sampling on evlog",[608,645,646],{},"Set up tail sampling so I keep all errors and slow requests while dropping healthy noise.",[648,649,650,657,671,674,684],"ul",{},[651,652,653,654],"li",{},"Start with the built-in declarative rules: ",[623,655,656],{},"evlog.sampling.keep = { status: '>=400', duration: '>1000', path: ['\u002Fapi\u002Fauth\u002F*'] }",[651,658,659,660,662,663,666,667,670],{},"For multi-field or derived conditions, register an ",[623,661,629],{}," hook (Nitro: ",[623,664,665],{},"nitroApp.hooks.hook('evlog:emit:keep', (ctx) => ...)","); set ",[623,668,669],{},"ctx.shouldKeep = true"," to keep",[651,672,673],{},"Keep the hook fast. It runs on every request after enrichment, so no I\u002FO and no async work",[651,675,676,677,680,681,683],{},"Combine with head sampling (e.g. 10% of healthy traffic) by setting both ",[623,678,679],{},"sample"," (head) and ",[623,682,625],{}," (tail)",[651,685,686,687,690],{},"Always keep error events (",[623,688,689],{},"level: 'error'",") regardless of sampling; double-check rules don't accidentally drop them",[608,692,693,694],{},"Docs: ",[632,695,696],{"href":696,"rel":697},"https:\u002F\u002Fwww.evlog.dev\u002Fextend\u002Ftail-sampling",[698],"nofollow",[700,701,703],"h2",{"id":702},"when-the-built-in-rules-arent-enough","When the built-in rules aren't enough",[608,705,706,707,709],{},"The built-in declarative ",[623,708,625],{}," rules cover the typical cases (status code thresholds, duration thresholds, path matching, level matching). Drop to a custom hook when you need:",[648,711,712,726,734],{},[651,713,714,717,718,721,722,725],{},[611,715,716],{},"Conditional logic on more than one field"," (e.g. \"keep if ",[623,719,720],{},"status >= 500"," AND ",[623,723,724],{},"user.plan === 'enterprise'","\")",[651,727,728,717,731,725],{},[611,729,730],{},"Keep based on a derived value",[623,732,733],{},"event.audit?.context.actor.role === 'admin'",[651,735,736,739],{},[611,737,738],{},"Stateful decisions"," (rare; needs care since sampling runs in the hot path)",[700,741,743],{"id":742},"custom-keep-hook","Custom keep hook",[608,745,746],{},"The hook signature is the same regardless of framework. The wiring depends on your runtime.",[748,749,750,909],"code-group",{},[751,752,758],"pre",{"className":753,"code":754,"filename":755,"language":756,"meta":757,"style":757},"language-ts shiki shiki-themes material-theme-lighter material-theme material-theme-palenight","nitroApp.hooks.hook('evlog:emit:keep', (ctx) => {\n  if (ctx.context.user?.plan === 'enterprise' && ctx.status >= 500) {\n    ctx.shouldKeep = true\n  }\n})\n","Nuxt \u002F Nitro","ts","",[623,759,760,813,876,894,900],{"__ignoreMap":757},[761,762,765,769,773,776,778,782,785,788,791,793,796,799,803,806,810],"span",{"class":763,"line":764},"line",1,[761,766,768],{"class":767},"sTEyZ","nitroApp",[761,770,772],{"class":771},"sMK4o",".",[761,774,775],{"class":767},"hooks",[761,777,772],{"class":771},[761,779,781],{"class":780},"s2Zo4","hook",[761,783,784],{"class":767},"(",[761,786,787],{"class":771},"'",[761,789,629],{"class":790},"sfazB",[761,792,787],{"class":771},[761,794,795],{"class":771},",",[761,797,798],{"class":771}," (",[761,800,802],{"class":801},"sHdIc","ctx",[761,804,805],{"class":771},")",[761,807,809],{"class":808},"spNyl"," =>",[761,811,812],{"class":771}," {\n",[761,814,816,820,823,825,827,830,832,835,838,841,844,847,850,852,855,858,860,863,866,870,873],{"class":763,"line":815},2,[761,817,819],{"class":818},"s7zQu","  if",[761,821,798],{"class":822},"swJcz",[761,824,802],{"class":767},[761,826,772],{"class":771},[761,828,829],{"class":767},"context",[761,831,772],{"class":771},[761,833,834],{"class":767},"user",[761,836,837],{"class":771},"?.",[761,839,840],{"class":767},"plan",[761,842,843],{"class":771}," ===",[761,845,846],{"class":771}," '",[761,848,849],{"class":790},"enterprise",[761,851,787],{"class":771},[761,853,854],{"class":771}," &&",[761,856,857],{"class":767}," ctx",[761,859,772],{"class":771},[761,861,862],{"class":767},"status",[761,864,865],{"class":771}," >=",[761,867,869],{"class":868},"sbssI"," 500",[761,871,872],{"class":822},") ",[761,874,875],{"class":771},"{\n",[761,877,879,882,884,887,890],{"class":763,"line":878},3,[761,880,881],{"class":767},"    ctx",[761,883,772],{"class":771},[761,885,886],{"class":767},"shouldKeep",[761,888,889],{"class":771}," =",[761,891,893],{"class":892},"sfNiH"," true\n",[761,895,897],{"class":763,"line":896},4,[761,898,899],{"class":771},"  }\n",[761,901,903,906],{"class":763,"line":902},5,[761,904,905],{"class":771},"}",[761,907,908],{"class":767},")\n",[751,910,913],{"className":753,"code":911,"filename":912,"language":756,"meta":757,"style":757},"import { definePlugin } from 'evlog\u002Ftoolkit'\n\nexport const keepEnterpriseErrors = definePlugin({\n  name: 'keep-enterprise-errors',\n  keep(ctx) {\n    if (ctx.context.user?.plan === 'enterprise' && ctx.status >= 500) {\n      ctx.shouldKeep = true\n    }\n  },\n})\n\n\u002F\u002F Then: initLogger({ plugins: [keepEnterpriseErrors] })\n\u002F\u002F   or: app.use(evlog({ plugins: [keepEnterpriseErrors] }))\n","Plugin (any framework)",[623,914,915,940,946,966,984,997,1043,1057,1063,1069,1076,1081,1088],{"__ignoreMap":757},[761,916,917,920,923,926,929,932,934,937],{"class":763,"line":764},[761,918,919],{"class":818},"import",[761,921,922],{"class":771}," {",[761,924,925],{"class":767}," definePlugin",[761,927,928],{"class":771}," }",[761,930,931],{"class":818}," from",[761,933,846],{"class":771},[761,935,936],{"class":790},"evlog\u002Ftoolkit",[761,938,939],{"class":771},"'\n",[761,941,942],{"class":763,"line":815},[761,943,945],{"emptyLinePlaceholder":944},true,"\n",[761,947,948,951,954,957,960,962,964],{"class":763,"line":878},[761,949,950],{"class":818},"export",[761,952,953],{"class":808}," const",[761,955,956],{"class":767}," keepEnterpriseErrors ",[761,958,959],{"class":771},"=",[761,961,925],{"class":780},[761,963,784],{"class":767},[761,965,875],{"class":771},[761,967,968,971,974,976,979,981],{"class":763,"line":896},[761,969,970],{"class":822},"  name",[761,972,973],{"class":771},":",[761,975,846],{"class":771},[761,977,978],{"class":790},"keep-enterprise-errors",[761,980,787],{"class":771},[761,982,983],{"class":771},",\n",[761,985,986,989,991,993,995],{"class":763,"line":902},[761,987,988],{"class":822},"  keep",[761,990,784],{"class":771},[761,992,802],{"class":801},[761,994,805],{"class":771},[761,996,812],{"class":771},[761,998,1000,1003,1005,1007,1009,1011,1013,1015,1017,1019,1021,1023,1025,1027,1029,1031,1033,1035,1037,1039,1041],{"class":763,"line":999},6,[761,1001,1002],{"class":818},"    if",[761,1004,798],{"class":822},[761,1006,802],{"class":767},[761,1008,772],{"class":771},[761,1010,829],{"class":767},[761,1012,772],{"class":771},[761,1014,834],{"class":767},[761,1016,837],{"class":771},[761,1018,840],{"class":767},[761,1020,843],{"class":771},[761,1022,846],{"class":771},[761,1024,849],{"class":790},[761,1026,787],{"class":771},[761,1028,854],{"class":771},[761,1030,857],{"class":767},[761,1032,772],{"class":771},[761,1034,862],{"class":767},[761,1036,865],{"class":771},[761,1038,869],{"class":868},[761,1040,872],{"class":822},[761,1042,875],{"class":771},[761,1044,1046,1049,1051,1053,1055],{"class":763,"line":1045},7,[761,1047,1048],{"class":767},"      ctx",[761,1050,772],{"class":771},[761,1052,886],{"class":767},[761,1054,889],{"class":771},[761,1056,893],{"class":892},[761,1058,1060],{"class":763,"line":1059},8,[761,1061,1062],{"class":771},"    }\n",[761,1064,1066],{"class":763,"line":1065},9,[761,1067,1068],{"class":771},"  },\n",[761,1070,1072,1074],{"class":763,"line":1071},10,[761,1073,905],{"class":771},[761,1075,908],{"class":767},[761,1077,1079],{"class":763,"line":1078},11,[761,1080,945],{"emptyLinePlaceholder":944},[761,1082,1084],{"class":763,"line":1083},12,[761,1085,1087],{"class":1086},"sHwdD","\u002F\u002F Then: initLogger({ plugins: [keepEnterpriseErrors] })\n",[761,1089,1091],{"class":763,"line":1090},13,[761,1092,1093],{"class":1086},"\u002F\u002F   or: app.use(evlog({ plugins: [keepEnterpriseErrors] }))\n",[608,1095,1096],{},"For non-trivial logic, prefer the plugin shape, since it travels with the rest of your evlog config (drains, enrichers) and is reusable across frameworks.",[700,1098,1100],{"id":1099},"composing-several-keep-predicates","Composing several keep predicates",[608,1102,1103,1104,1107,1108,1110,1111,1113,1114,1117],{},"Use ",[623,1105,1106],{},"composeKeep"," from ",[623,1109,936],{}," to combine multiple predicates into one hook. Each predicate runs independently and the final ",[623,1112,886],{}," is ",[623,1115,1116],{},"true"," if any of them set it:",[751,1119,1121],{"className":753,"code":1120,"language":756,"meta":757,"style":757},"import { composeKeep } from 'evlog\u002Ftoolkit'\n\nconst keep = composeKeep([\n  ({ duration, shouldKeep }) => duration && duration > 2000 ? true : shouldKeep,\n  ({ event }) => event.level === 'error',\n  ({ context, status }) => context.user?.plan === 'enterprise' && status >= 500,\n])\n",[623,1122,1123,1142,1146,1161,1206,1236,1283],{"__ignoreMap":757},[761,1124,1125,1127,1129,1132,1134,1136,1138,1140],{"class":763,"line":764},[761,1126,919],{"class":818},[761,1128,922],{"class":771},[761,1130,1131],{"class":767}," composeKeep",[761,1133,928],{"class":771},[761,1135,931],{"class":818},[761,1137,846],{"class":771},[761,1139,936],{"class":790},[761,1141,939],{"class":771},[761,1143,1144],{"class":763,"line":815},[761,1145,945],{"emptyLinePlaceholder":944},[761,1147,1148,1151,1154,1156,1158],{"class":763,"line":878},[761,1149,1150],{"class":808},"const",[761,1152,1153],{"class":767}," keep ",[761,1155,959],{"class":771},[761,1157,1131],{"class":780},[761,1159,1160],{"class":767},"([\n",[761,1162,1163,1166,1169,1171,1174,1177,1179,1182,1185,1187,1190,1193,1196,1199,1202,1204],{"class":763,"line":896},[761,1164,1165],{"class":771},"  ({",[761,1167,1168],{"class":801}," duration",[761,1170,795],{"class":771},[761,1172,1173],{"class":801}," shouldKeep",[761,1175,1176],{"class":771}," })",[761,1178,809],{"class":808},[761,1180,1181],{"class":767}," duration ",[761,1183,1184],{"class":771},"&&",[761,1186,1181],{"class":767},[761,1188,1189],{"class":771},">",[761,1191,1192],{"class":868}," 2000",[761,1194,1195],{"class":771}," ?",[761,1197,1198],{"class":892}," true",[761,1200,1201],{"class":771}," :",[761,1203,1173],{"class":767},[761,1205,983],{"class":771},[761,1207,1208,1210,1213,1215,1217,1219,1221,1224,1227,1229,1232,1234],{"class":763,"line":902},[761,1209,1165],{"class":771},[761,1211,1212],{"class":801}," event",[761,1214,1176],{"class":771},[761,1216,809],{"class":808},[761,1218,1212],{"class":767},[761,1220,772],{"class":771},[761,1222,1223],{"class":767},"level ",[761,1225,1226],{"class":771},"===",[761,1228,846],{"class":771},[761,1230,1231],{"class":790},"error",[761,1233,787],{"class":771},[761,1235,983],{"class":771},[761,1237,1238,1240,1243,1245,1248,1250,1252,1254,1256,1258,1260,1263,1265,1267,1269,1271,1273,1276,1279,1281],{"class":763,"line":999},[761,1239,1165],{"class":771},[761,1241,1242],{"class":801}," context",[761,1244,795],{"class":771},[761,1246,1247],{"class":801}," status",[761,1249,1176],{"class":771},[761,1251,809],{"class":808},[761,1253,1242],{"class":767},[761,1255,772],{"class":771},[761,1257,834],{"class":767},[761,1259,837],{"class":771},[761,1261,1262],{"class":767},"plan ",[761,1264,1226],{"class":771},[761,1266,846],{"class":771},[761,1268,849],{"class":790},[761,1270,787],{"class":771},[761,1272,854],{"class":771},[761,1274,1275],{"class":767}," status ",[761,1277,1278],{"class":771},">=",[761,1280,869],{"class":868},[761,1282,983],{"class":771},[761,1284,1285],{"class":763,"line":1045},[761,1286,1287],{"class":767},"])\n",[608,1289,1290,1291,1294],{},"Errors in individual predicates are isolated (logged with the ",[623,1292,1293],{},"[evlog\u002Fkeep]"," prefix) so a buggy predicate cannot silently drop legitimate events.",[700,1296,1298],{"id":1297},"what-you-receive","What you receive",[608,1300,1301,1302,973],{},"The keep hook gets a ",[623,1303,1304],{},"TailSamplingContext",[751,1306,1308],{"className":753,"code":1307,"language":756,"meta":757,"style":757},"interface TailSamplingContext {\n  \u002F** The event level (debug | info | warn | error) *\u002F\n  level: string\n  \u002F** HTTP response status, if known *\u002F\n  status?: number\n  \u002F** Request duration in milliseconds, if measured *\u002F\n  duration?: number\n  \u002F** The full accumulated context (everything log.set'd) *\u002F\n  context: Record\u003Cstring, unknown>\n  \u002F** The fully enriched event ready to drain *\u002F\n  event: WideEvent\n  \u002F** Mutable: set to true to force-keep this event *\u002F\n  shouldKeep: boolean\n}\n",[623,1309,1310,1321,1326,1336,1341,1352,1357,1366,1371,1395,1400,1410,1415,1425],{"__ignoreMap":757},[761,1311,1312,1315,1319],{"class":763,"line":764},[761,1313,1314],{"class":808},"interface",[761,1316,1318],{"class":1317},"sBMFI"," TailSamplingContext",[761,1320,812],{"class":771},[761,1322,1323],{"class":763,"line":815},[761,1324,1325],{"class":1086},"  \u002F** The event level (debug | info | warn | error) *\u002F\n",[761,1327,1328,1331,1333],{"class":763,"line":878},[761,1329,1330],{"class":822},"  level",[761,1332,973],{"class":771},[761,1334,1335],{"class":1317}," string\n",[761,1337,1338],{"class":763,"line":896},[761,1339,1340],{"class":1086},"  \u002F** HTTP response status, if known *\u002F\n",[761,1342,1343,1346,1349],{"class":763,"line":902},[761,1344,1345],{"class":822},"  status",[761,1347,1348],{"class":771},"?:",[761,1350,1351],{"class":1317}," number\n",[761,1353,1354],{"class":763,"line":999},[761,1355,1356],{"class":1086},"  \u002F** Request duration in milliseconds, if measured *\u002F\n",[761,1358,1359,1362,1364],{"class":763,"line":1045},[761,1360,1361],{"class":822},"  duration",[761,1363,1348],{"class":771},[761,1365,1351],{"class":1317},[761,1367,1368],{"class":763,"line":1059},[761,1369,1370],{"class":1086},"  \u002F** The full accumulated context (everything log.set'd) *\u002F\n",[761,1372,1373,1376,1378,1381,1384,1387,1389,1392],{"class":763,"line":1065},[761,1374,1375],{"class":822},"  context",[761,1377,973],{"class":771},[761,1379,1380],{"class":1317}," Record",[761,1382,1383],{"class":771},"\u003C",[761,1385,1386],{"class":1317},"string",[761,1388,795],{"class":771},[761,1390,1391],{"class":1317}," unknown",[761,1393,1394],{"class":771},">\n",[761,1396,1397],{"class":763,"line":1071},[761,1398,1399],{"class":1086},"  \u002F** The fully enriched event ready to drain *\u002F\n",[761,1401,1402,1405,1407],{"class":763,"line":1078},[761,1403,1404],{"class":822},"  event",[761,1406,973],{"class":771},[761,1408,1409],{"class":1317}," WideEvent\n",[761,1411,1412],{"class":763,"line":1083},[761,1413,1414],{"class":1086},"  \u002F** Mutable: set to true to force-keep this event *\u002F\n",[761,1416,1417,1420,1422],{"class":763,"line":1090},[761,1418,1419],{"class":822},"  shouldKeep",[761,1421,973],{"class":771},[761,1423,1424],{"class":1317}," boolean\n",[761,1426,1428],{"class":763,"line":1427},14,[761,1429,1430],{"class":771},"}\n",[608,1432,1433,1434,1437,1438,1441],{},"Setting ",[623,1435,1436],{},"shouldKeep = true"," forces the event through. Setting ",[623,1439,1440],{},"shouldKeep = false"," is a no-op (other predicates may still keep it; the head sampler decides the default).",[700,1443,1445],{"id":1444},"next-steps","Next steps",[648,1447,1448,1456,1461],{},[651,1449,1450,1452,1453,1455],{},[632,1451,66],{"href":67},": head sampling, tail sampling, the built-in declarative ",[623,1454,625],{}," rules",[651,1457,1458,1460],{},[632,1459,508],{"href":509},": when keep belongs in a multi-hook plugin",[651,1462,1463,1465],{},[632,1464,556],{"href":557},": keep all errors, double-check the rules",[1467,1468,1469],"style",{},"html pre.shiki code .sTEyZ, html code.shiki .sTEyZ{--shiki-light:#90A4AE;--shiki-default:#EEFFFF;--shiki-dark:#BABED8}html pre.shiki code .sMK4o, html code.shiki .sMK4o{--shiki-light:#39ADB5;--shiki-default:#89DDFF;--shiki-dark:#89DDFF}html pre.shiki code .s2Zo4, html code.shiki .s2Zo4{--shiki-light:#6182B8;--shiki-default:#82AAFF;--shiki-dark:#82AAFF}html pre.shiki code .sfazB, html code.shiki .sfazB{--shiki-light:#91B859;--shiki-default:#C3E88D;--shiki-dark:#C3E88D}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 pre.shiki code .spNyl, html code.shiki .spNyl{--shiki-light:#9C3EDA;--shiki-default:#C792EA;--shiki-dark:#C792EA}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 .swJcz, html code.shiki .swJcz{--shiki-light:#E53935;--shiki-default:#F07178;--shiki-dark:#F07178}html pre.shiki code .sbssI, html code.shiki .sbssI{--shiki-light:#F76D47;--shiki-default:#F78C6C;--shiki-dark:#F78C6C}html pre.shiki code .sfNiH, html code.shiki .sfNiH{--shiki-light:#FF5370;--shiki-default:#FF9CAC;--shiki-dark:#FF9CAC}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 .sBMFI, html code.shiki .sBMFI{--shiki-light:#E2931D;--shiki-default:#FFCB6B;--shiki-dark:#FFCB6B}",{"title":757,"searchDepth":815,"depth":815,"links":1471},[1472,1473,1474,1475,1476],{"id":702,"depth":815,"text":703},{"id":742,"depth":815,"text":743},{"id":1099,"depth":815,"text":1100},{"id":1297,"depth":815,"text":1298},{"id":1444,"depth":815,"text":1445},"Decide after the fact whether to keep an event, knowing its status, duration, and errors. Keep every error, throw away healthy noise.","md",[1480,1484],{"label":1481,"icon":69,"to":67,"color":1482,"variant":1483},"Sampling Reference","neutral","subtle",{"label":508,"icon":483,"to":509,"color":1482,"variant":1483},{},{"title":516,"icon":69},{"title":600,"description":1477},"kTOzDQWFtFub4P4dnU8BGJhJzdLEYFKBD6mtGd67kes",[1490,1492],{"title":512,"path":513,"stem":514,"description":1491,"icon":443,"children":-1},"Write an enricher that adds deployment metadata, tenant ids, feature flags, or anything computed. Error isolation and merging are handled.",{"title":520,"path":521,"stem":522,"description":1493,"icon":523,"children":-1},"Every drain request carries User-Agent and X-Evlog-Source so receivers can triage the traffic. Override or suppress them when you need to.",1789076918994]