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LogTape","\u002Fcompare\u002Flogtape","9.compare\u002F3.logtape",{"title":605,"path":606,"stem":607,"icon":577},"evlog vs Winston: formats and request events","\u002Fcompare\u002Fwinston","9.compare\u002F4.winston",{"title":609,"path":610,"stem":611,"icon":577},"evlog vs Consola: reporters and request context","\u002Fcompare\u002Fconsola","9.compare\u002F5.consola",{"id":613,"title":66,"body":614,"description":2954,"extension":2955,"links":2956,"meta":2961,"navigation":2962,"path":67,"seo":2963,"stem":68,"__hash__":2964},"docs\u002F2.learn\u002F5.sampling.md",{"type":615,"value":616,"toc":2944},"minimark",[617,621,669,674,682,685,1166,1173,1182,1186,1193,1320,1343,1348,1420,1424,1427,1458,1468,1471,1676,1680,1690,2140,2146,2251,2255,2258,2915,2924,2928,2940],[618,619,620],"p",{},"At scale, logging everything gets expensive fast. Sampling lets you keep costs under control without losing visibility into what matters. evlog uses a two-tier approach: head sampling drops noise upfront, tail sampling rescues critical events after the fact.",[622,623,626,629,655],"prompt",{":actions":624,"description":625,"icon":69},"[\"copy\",\"cursor\",\"claude\"]","Enable head and tail sampling",[618,627,628],{},"Enable head and tail sampling in my evlog production config.",[630,631,632,636,639,646,649,652],"ul",{},[633,634,635],"li",{},"Identify my framework and locate the evlog config (nuxt.config.ts, lib\u002Fevlog.ts, initLogger, etc.)",[633,637,638],{},"Configure sampling.rates per level: { info: 10, warn: 50, debug: 0, error: 100 } as a starting point",[633,640,641,642],{},"Add sampling.keep rules to force-keep critical events: ",[643,644,645],"span",{},"{ status: 400 }, { duration: 1000 }, { path: '\u002Fapi\u002Fcritical\u002F**' }",[633,647,648],{},"For business-specific keep logic (e.g. premium users), add a custom keep callback or evlog:emit:keep hook",[633,650,651],{},"Wrap sampling in a $production override so dev keeps full logging",[633,653,654],{},"Confirm errors are always kept by default unless I explicitly set error: 0",[618,656,657,658,664,665],{},"Docs: ",[659,660,661],"a",{"href":661,"rel":662},"https:\u002F\u002Fwww.evlog.dev\u002Flearn\u002Fsampling",[663],"nofollow","\nBest practices: ",[659,666,667],{"href":667,"rel":668},"https:\u002F\u002Fwww.evlog.dev\u002Freference\u002Fbest-practices",[663],[670,671,673],"h2",{"id":672},"drop-noise-before-it-is-built","Drop noise before it is built",[618,675,676,677,681],{},"Head sampling randomly keeps a percentage of logs per level. It runs ",[678,679,680],"strong",{},"before"," the request completes, acting as a coin flip at emission time.",[683,684],"head-sampling-plinko",{},[686,687,688,875,1034],"code-group",{},[689,690,696],"pre",{"className":691,"code":692,"filename":693,"language":694,"meta":695,"style":695},"language-typescript shiki shiki-themes material-theme-lighter material-theme material-theme-palenight","export default defineNuxtConfig({\n  modules: ['evlog\u002Fnuxt'],\n  evlog: {\n    sampling: {\n      rates: {\n        info: 10,    \u002F\u002F Keep 10% of info logs\n        warn: 50,    \u002F\u002F Keep 50% of warnings\n        debug: 0,    \u002F\u002F Drop all debug logs\n        error: 100,  \u002F\u002F Always keep errors (default)\n      },\n    },\n  },\n})\n","nuxt.config.ts","typescript","",[697,698,699,722,750,761,771,781,800,816,832,848,854,860,866],"code",{"__ignoreMap":695},[643,700,703,707,710,714,718],{"class":701,"line":702},"line",1,[643,704,706],{"class":705},"s7zQu","export",[643,708,709],{"class":705}," default",[643,711,713],{"class":712},"s2Zo4"," defineNuxtConfig",[643,715,717],{"class":716},"sTEyZ","(",[643,719,721],{"class":720},"sMK4o","{\n",[643,723,725,729,732,735,738,742,744,747],{"class":701,"line":724},2,[643,726,728],{"class":727},"swJcz","  modules",[643,730,731],{"class":720},":",[643,733,734],{"class":716}," [",[643,736,737],{"class":720},"'",[643,739,741],{"class":740},"sfazB","evlog\u002Fnuxt",[643,743,737],{"class":720},[643,745,746],{"class":716},"]",[643,748,749],{"class":720},",\n",[643,751,753,756,758],{"class":701,"line":752},3,[643,754,755],{"class":727},"  evlog",[643,757,731],{"class":720},[643,759,760],{"class":720}," {\n",[643,762,764,767,769],{"class":701,"line":763},4,[643,765,766],{"class":727},"    sampling",[643,768,731],{"class":720},[643,770,760],{"class":720},[643,772,774,777,779],{"class":701,"line":773},5,[643,775,776],{"class":727},"      rates",[643,778,731],{"class":720},[643,780,760],{"class":720},[643,782,784,787,789,793,796],{"class":701,"line":783},6,[643,785,786],{"class":727},"        info",[643,788,731],{"class":720},[643,790,792],{"class":791},"sbssI"," 10",[643,794,795],{"class":720},",",[643,797,799],{"class":798},"sHwdD","    \u002F\u002F Keep 10% of info logs\n",[643,801,803,806,808,811,813],{"class":701,"line":802},7,[643,804,805],{"class":727},"        warn",[643,807,731],{"class":720},[643,809,810],{"class":791}," 50",[643,812,795],{"class":720},[643,814,815],{"class":798},"    \u002F\u002F Keep 50% of warnings\n",[643,817,819,822,824,827,829],{"class":701,"line":818},8,[643,820,821],{"class":727},"        debug",[643,823,731],{"class":720},[643,825,826],{"class":791}," 0",[643,828,795],{"class":720},[643,830,831],{"class":798},"    \u002F\u002F Drop all debug logs\n",[643,833,835,838,840,843,845],{"class":701,"line":834},9,[643,836,837],{"class":727},"        error",[643,839,731],{"class":720},[643,841,842],{"class":791}," 100",[643,844,795],{"class":720},[643,846,847],{"class":798},"  \u002F\u002F Always keep errors (default)\n",[643,849,851],{"class":701,"line":850},10,[643,852,853],{"class":720},"      },\n",[643,855,857],{"class":701,"line":856},11,[643,858,859],{"class":720},"    },\n",[643,861,863],{"class":701,"line":862},12,[643,864,865],{"class":720},"  },\n",[643,867,869,872],{"class":701,"line":868},13,[643,870,871],{"class":720},"}",[643,873,874],{"class":716},")\n",[689,876,879],{"className":691,"code":877,"filename":878,"language":694,"meta":695,"style":695},"import { createEvlog } from 'evlog\u002Fnext'\n\nexport const { withEvlog, useLogger } = createEvlog({\n  service: 'my-app',\n  sampling: {\n    rates: {\n      info: 10,\n      warn: 50,\n      debug: 0,\n      error: 100,\n    },\n  },\n})\n","lib\u002Fevlog.ts (Next.js)",[697,880,881,907,913,942,958,967,976,987,998,1009,1020,1024,1028],{"__ignoreMap":695},[643,882,883,886,889,892,895,898,901,904],{"class":701,"line":702},[643,884,885],{"class":705},"import",[643,887,888],{"class":720}," {",[643,890,891],{"class":716}," createEvlog",[643,893,894],{"class":720}," }",[643,896,897],{"class":705}," from",[643,899,900],{"class":720}," '",[643,902,903],{"class":740},"evlog\u002Fnext",[643,905,906],{"class":720},"'\n",[643,908,909],{"class":701,"line":724},[643,910,912],{"emptyLinePlaceholder":911},true,"\n",[643,914,915,917,921,923,926,928,931,933,936,938,940],{"class":701,"line":752},[643,916,706],{"class":705},[643,918,920],{"class":919},"spNyl"," const",[643,922,888],{"class":720},[643,924,925],{"class":716}," withEvlog",[643,927,795],{"class":720},[643,929,930],{"class":716}," useLogger ",[643,932,871],{"class":720},[643,934,935],{"class":720}," =",[643,937,891],{"class":712},[643,939,717],{"class":716},[643,941,721],{"class":720},[643,943,944,947,949,951,954,956],{"class":701,"line":763},[643,945,946],{"class":727},"  service",[643,948,731],{"class":720},[643,950,900],{"class":720},[643,952,953],{"class":740},"my-app",[643,955,737],{"class":720},[643,957,749],{"class":720},[643,959,960,963,965],{"class":701,"line":773},[643,961,962],{"class":727},"  sampling",[643,964,731],{"class":720},[643,966,760],{"class":720},[643,968,969,972,974],{"class":701,"line":783},[643,970,971],{"class":727},"    rates",[643,973,731],{"class":720},[643,975,760],{"class":720},[643,977,978,981,983,985],{"class":701,"line":802},[643,979,980],{"class":727},"      info",[643,982,731],{"class":720},[643,984,792],{"class":791},[643,986,749],{"class":720},[643,988,989,992,994,996],{"class":701,"line":818},[643,990,991],{"class":727},"      warn",[643,993,731],{"class":720},[643,995,810],{"class":791},[643,997,749],{"class":720},[643,999,1000,1003,1005,1007],{"class":701,"line":834},[643,1001,1002],{"class":727},"      debug",[643,1004,731],{"class":720},[643,1006,826],{"class":791},[643,1008,749],{"class":720},[643,1010,1011,1014,1016,1018],{"class":701,"line":850},[643,1012,1013],{"class":727},"      error",[643,1015,731],{"class":720},[643,1017,842],{"class":791},[643,1019,749],{"class":720},[643,1021,1022],{"class":701,"line":856},[643,1023,859],{"class":720},[643,1025,1026],{"class":701,"line":862},[643,1027,865],{"class":720},[643,1029,1030,1032],{"class":701,"line":868},[643,1031,871],{"class":720},[643,1033,874],{"class":716},[689,1035,1038],{"className":691,"code":1036,"filename":1037,"language":694,"meta":695,"style":695},"import { initLogger } from 'evlog'\n\ninitLogger({\n  env: { service: 'my-app' },\n  sampling: {\n    rates: {\n      info: 10,\n      warn: 50,\n      debug: 0,\n      error: 100,\n    },\n  },\n})\n","index.ts (Hono \u002F Express \u002F Fastify)",[697,1039,1040,1060,1064,1073,1096,1104,1112,1122,1132,1142,1152,1156,1160],{"__ignoreMap":695},[643,1041,1042,1044,1046,1049,1051,1053,1055,1058],{"class":701,"line":702},[643,1043,885],{"class":705},[643,1045,888],{"class":720},[643,1047,1048],{"class":716}," initLogger",[643,1050,894],{"class":720},[643,1052,897],{"class":705},[643,1054,900],{"class":720},[643,1056,1057],{"class":740},"evlog",[643,1059,906],{"class":720},[643,1061,1062],{"class":701,"line":724},[643,1063,912],{"emptyLinePlaceholder":911},[643,1065,1066,1069,1071],{"class":701,"line":752},[643,1067,1068],{"class":712},"initLogger",[643,1070,717],{"class":716},[643,1072,721],{"class":720},[643,1074,1075,1078,1080,1082,1085,1087,1089,1091,1093],{"class":701,"line":763},[643,1076,1077],{"class":727},"  env",[643,1079,731],{"class":720},[643,1081,888],{"class":720},[643,1083,1084],{"class":727}," service",[643,1086,731],{"class":720},[643,1088,900],{"class":720},[643,1090,953],{"class":740},[643,1092,737],{"class":720},[643,1094,1095],{"class":720}," },\n",[643,1097,1098,1100,1102],{"class":701,"line":773},[643,1099,962],{"class":727},[643,1101,731],{"class":720},[643,1103,760],{"class":720},[643,1105,1106,1108,1110],{"class":701,"line":783},[643,1107,971],{"class":727},[643,1109,731],{"class":720},[643,1111,760],{"class":720},[643,1113,1114,1116,1118,1120],{"class":701,"line":802},[643,1115,980],{"class":727},[643,1117,731],{"class":720},[643,1119,792],{"class":791},[643,1121,749],{"class":720},[643,1123,1124,1126,1128,1130],{"class":701,"line":818},[643,1125,991],{"class":727},[643,1127,731],{"class":720},[643,1129,810],{"class":791},[643,1131,749],{"class":720},[643,1133,1134,1136,1138,1140],{"class":701,"line":834},[643,1135,1002],{"class":727},[643,1137,731],{"class":720},[643,1139,826],{"class":791},[643,1141,749],{"class":720},[643,1143,1144,1146,1148,1150],{"class":701,"line":850},[643,1145,1013],{"class":727},[643,1147,731],{"class":720},[643,1149,842],{"class":791},[643,1151,749],{"class":720},[643,1153,1154],{"class":701,"line":856},[643,1155,859],{"class":720},[643,1157,1158],{"class":701,"line":862},[643,1159,865],{"class":720},[643,1161,1162,1164],{"class":701,"line":868},[643,1163,871],{"class":720},[643,1165,874],{"class":716},[618,1167,1168,1169,1172],{},"Each level is a percentage from 0 to 100. Levels you don't configure default to 100% (keep everything). Error defaults to 100% even when other levels are configured, so you have to explicitly set ",[697,1170,1171],{},"error: 0"," to drop errors.",[1174,1175,1177,1178,1181],"callout",{"color":1176,"icon":13},"info","Head sampling is random. A ",[697,1179,1180],{},"10%"," rate means roughly 1 in 10 info logs are kept, not exactly 1 in 10.",[670,1183,1185],{"id":1184},"keep-an-event-once-you-know-its-outcome","Keep an event once you know its outcome",[618,1187,1188,1189,1192],{},"Head sampling is blind: it doesn't know if a request was slow, failed, or hit a critical path. Tail sampling fixes this by evaluating ",[678,1190,1191],{},"after"," the request completes and force-keeping logs that match specific conditions.",[689,1194,1196],{"className":691,"code":1195,"filename":693,"language":694,"meta":695,"style":695},"\u002F\u002F Sampling config, works the same across all frameworks\nevlog: {\n  sampling: {\n    rates: { info: 10 },\n    keep: [\n      { status: 400 },              \u002F\u002F HTTP status >= 400\n      { duration: 1000 },           \u002F\u002F Request took >= 1s\n      { path: '\u002Fapi\u002Fpayments\u002F**' }, \u002F\u002F Critical path (glob)\n    ],\n  },\n}\n",[697,1197,1198,1203,1212,1220,1237,1247,1266,1283,1304,1311,1315],{"__ignoreMap":695},[643,1199,1200],{"class":701,"line":702},[643,1201,1202],{"class":798},"\u002F\u002F Sampling config, works the same across all frameworks\n",[643,1204,1205,1208,1210],{"class":701,"line":724},[643,1206,1057],{"class":1207},"sBMFI",[643,1209,731],{"class":720},[643,1211,760],{"class":720},[643,1213,1214,1216,1218],{"class":701,"line":752},[643,1215,962],{"class":1207},[643,1217,731],{"class":720},[643,1219,760],{"class":720},[643,1221,1222,1224,1226,1228,1231,1233,1235],{"class":701,"line":763},[643,1223,971],{"class":1207},[643,1225,731],{"class":720},[643,1227,888],{"class":720},[643,1229,1230],{"class":1207}," info",[643,1232,731],{"class":720},[643,1234,792],{"class":791},[643,1236,1095],{"class":720},[643,1238,1239,1242,1244],{"class":701,"line":773},[643,1240,1241],{"class":1207},"    keep",[643,1243,731],{"class":720},[643,1245,1246],{"class":727}," [\n",[643,1248,1249,1252,1255,1257,1260,1263],{"class":701,"line":783},[643,1250,1251],{"class":720},"      {",[643,1253,1254],{"class":727}," status",[643,1256,731],{"class":720},[643,1258,1259],{"class":791}," 400",[643,1261,1262],{"class":720}," },",[643,1264,1265],{"class":798},"              \u002F\u002F HTTP status >= 400\n",[643,1267,1268,1270,1273,1275,1278,1280],{"class":701,"line":802},[643,1269,1251],{"class":720},[643,1271,1272],{"class":727}," duration",[643,1274,731],{"class":720},[643,1276,1277],{"class":791}," 1000",[643,1279,1262],{"class":720},[643,1281,1282],{"class":798},"           \u002F\u002F Request took >= 1s\n",[643,1284,1285,1287,1290,1292,1294,1297,1299,1301],{"class":701,"line":818},[643,1286,1251],{"class":720},[643,1288,1289],{"class":727}," path",[643,1291,731],{"class":720},[643,1293,900],{"class":720},[643,1295,1296],{"class":740},"\u002Fapi\u002Fpayments\u002F**",[643,1298,737],{"class":720},[643,1300,1262],{"class":720},[643,1302,1303],{"class":798}," \u002F\u002F Critical path (glob)\n",[643,1305,1306,1309],{"class":701,"line":834},[643,1307,1308],{"class":727},"    ]",[643,1310,749],{"class":720},[643,1312,1313],{"class":701,"line":850},[643,1314,865],{"class":720},[643,1316,1317],{"class":701,"line":856},[643,1318,1319],{"class":720},"}\n",[618,1321,1322,1323,1326,1327,1330,1331,1334,1335,1338,1339,1342],{},"Conditions use ",[678,1324,1325],{},">="," comparison for ",[697,1328,1329],{},"status"," and ",[697,1332,1333],{},"duration",", and glob matching for ",[697,1336,1337],{},"path",". If ",[678,1340,1341],{},"any"," condition matches, the log is kept regardless of head sampling (OR logic).",[1344,1345,1347],"h3",{"id":1346},"conditions-you-can-match-on","Conditions you can match on",[1349,1350,1351,1367],"table",{},[1352,1353,1354],"thead",{},[1355,1356,1357,1361,1364],"tr",{},[1358,1359,1360],"th",{},"Condition",[1358,1362,1363],{},"Type",[1358,1365,1366],{},"Description",[1368,1369,1370,1389,1402],"tbody",{},[1355,1371,1372,1377,1382],{},[1373,1374,1375],"td",{},[697,1376,1329],{},[1373,1378,1379],{},[697,1380,1381],{},"number",[1373,1383,1384,1385,1388],{},"Keep if HTTP status >= value (e.g., ",[697,1386,1387],{},"400"," catches all 4xx and 5xx)",[1355,1390,1391,1395,1399],{},[1373,1392,1393],{},[697,1394,1333],{},[1373,1396,1397],{},[697,1398,1381],{},[1373,1400,1401],{},"Keep if request duration >= value in milliseconds",[1355,1403,1404,1408,1413],{},[1373,1405,1406],{},[697,1407,1337],{},[1373,1409,1410],{},[697,1411,1412],{},"string",[1373,1414,1415,1416,1419],{},"Keep if request path matches glob pattern (e.g., ",[697,1417,1418],{},"'\u002Fapi\u002Fcritical\u002F**'",")",[670,1421,1423],{"id":1422},"combine-head-and-tail-sampling","Combine head and tail sampling",[618,1425,1426],{},"The two tiers complement each other:",[1428,1429,1430,1436,1446,1452],"ol",{},[633,1431,1432,1435],{},[678,1433,1434],{},"Request completes"," - evlog knows the status, duration, and path",[633,1437,1438,1441,1442,1445],{},[678,1439,1440],{},"Tail sampling evaluates"," - if any ",[697,1443,1444],{},"keep"," condition matches, the log is force-kept",[633,1447,1448,1451],{},[678,1449,1450],{},"Head sampling applies"," - only if tail sampling didn't force-keep, the random percentage check runs",[633,1453,1454,1457],{},[678,1455,1456],{},"Log emits or drops"," - kept logs go through enrichment and draining as normal",[618,1459,1460,1461,1464,1465,1467],{},"This means a request to ",[697,1462,1463],{},"\u002Fapi\u002Fpayments\u002Fcharge"," that returns a 500 in 2 seconds will always be logged, even if ",[697,1466,1176],{}," is set to 1%. The tail conditions rescue it.",[1469,1470],"tail-sample-decision",{},[686,1472,1473,1549],{},[689,1474,1476],{"className":691,"code":1475,"filename":557,"language":694,"meta":695,"style":695},"sampling: {\n  rates: { info: 10 },\n  keep: [\n    { status: 400 },\n    { duration: 1000 },\n  ],\n}\n",[697,1477,1478,1487,1504,1513,1526,1538,1545],{"__ignoreMap":695},[643,1479,1480,1483,1485],{"class":701,"line":702},[643,1481,1482],{"class":1207},"sampling",[643,1484,731],{"class":720},[643,1486,760],{"class":720},[643,1488,1489,1492,1494,1496,1498,1500,1502],{"class":701,"line":724},[643,1490,1491],{"class":1207},"  rates",[643,1493,731],{"class":720},[643,1495,888],{"class":720},[643,1497,1230],{"class":1207},[643,1499,731],{"class":720},[643,1501,792],{"class":791},[643,1503,1095],{"class":720},[643,1505,1506,1509,1511],{"class":701,"line":752},[643,1507,1508],{"class":1207},"  keep",[643,1510,731],{"class":720},[643,1512,1246],{"class":727},[643,1514,1515,1518,1520,1522,1524],{"class":701,"line":763},[643,1516,1517],{"class":720},"    {",[643,1519,1254],{"class":727},[643,1521,731],{"class":720},[643,1523,1259],{"class":791},[643,1525,1095],{"class":720},[643,1527,1528,1530,1532,1534,1536],{"class":701,"line":773},[643,1529,1517],{"class":720},[643,1531,1272],{"class":727},[643,1533,731],{"class":720},[643,1535,1277],{"class":791},[643,1537,1095],{"class":720},[643,1539,1540,1543],{"class":701,"line":783},[643,1541,1542],{"class":727},"  ]",[643,1544,749],{"class":720},[643,1546,1547],{"class":701,"line":802},[643,1548,1319],{"class":720},[689,1550,1555],{"className":1551,"code":1552,"filename":1553,"language":1554,"meta":695,"style":695},"language-bash shiki shiki-themes material-theme-lighter material-theme material-theme-palenight","POST \u002Fapi\u002Fusers     200  45ms   → 10% chance (head sampling)\nPOST \u002Fapi\u002Fusers     500  45ms   → always kept (status >= 400)\nGET  \u002Fapi\u002Fproducts  200  2300ms → always kept (duration >= 1000)\nPOST \u002Fapi\u002Fcheckout  200  120ms  → 10% chance (head sampling)\n","What gets logged","bash",[697,1556,1557,1587,1619,1651],{"__ignoreMap":695},[643,1558,1559,1562,1565,1568,1571,1574,1577,1580,1583,1585],{"class":701,"line":702},[643,1560,1561],{"class":1207},"POST",[643,1563,1564],{"class":740}," \u002Fapi\u002Fusers",[643,1566,1567],{"class":791},"     200",[643,1569,1570],{"class":740},"  45ms",[643,1572,1573],{"class":740},"   →",[643,1575,1576],{"class":740}," 10%",[643,1578,1579],{"class":740}," chance",[643,1581,1582],{"class":716}," (head ",[643,1584,1482],{"class":740},[643,1586,874],{"class":716},[643,1588,1589,1591,1593,1596,1598,1600,1603,1606,1609,1612,1615,1617],{"class":701,"line":724},[643,1590,1561],{"class":1207},[643,1592,1564],{"class":740},[643,1594,1595],{"class":791},"     500",[643,1597,1570],{"class":740},[643,1599,1573],{"class":740},[643,1601,1602],{"class":740}," always",[643,1604,1605],{"class":740}," kept",[643,1607,1608],{"class":716}," (status ",[643,1610,1611],{"class":720},">",[643,1613,1614],{"class":740},"=",[643,1616,1259],{"class":791},[643,1618,874],{"class":716},[643,1620,1621,1624,1627,1630,1633,1636,1638,1640,1643,1645,1647,1649],{"class":701,"line":752},[643,1622,1623],{"class":1207},"GET",[643,1625,1626],{"class":740},"  \u002Fapi\u002Fproducts",[643,1628,1629],{"class":791},"  200",[643,1631,1632],{"class":740},"  2300ms",[643,1634,1635],{"class":740}," →",[643,1637,1602],{"class":740},[643,1639,1605],{"class":740},[643,1641,1642],{"class":716}," (duration ",[643,1644,1611],{"class":720},[643,1646,1614],{"class":740},[643,1648,1277],{"class":791},[643,1650,874],{"class":716},[643,1652,1653,1655,1658,1660,1663,1666,1668,1670,1672,1674],{"class":701,"line":763},[643,1654,1561],{"class":1207},[643,1656,1657],{"class":740}," \u002Fapi\u002Fcheckout",[643,1659,1629],{"class":791},[643,1661,1662],{"class":740},"  120ms",[643,1664,1665],{"class":740},"  →",[643,1667,1576],{"class":740},[643,1669,1579],{"class":740},[643,1671,1582],{"class":716},[643,1673,1482],{"class":740},[643,1675,874],{"class":716},[670,1677,1679],{"id":1678},"write-your-own-keep-rule","Write your own keep rule",[618,1681,1682,1683,1686,1687,1689],{},"For conditions beyond status, duration, and path, use the ",[697,1684,1685],{},"evlog:emit:keep"," hook in Nuxt\u002FNitro or the ",[697,1688,1444],{}," callback in other frameworks.",[686,1691,1692,1834,2021],{},[689,1693,1696],{"className":691,"code":1694,"filename":1695,"language":694,"meta":695,"style":695},"export default defineNitroPlugin((nitroApp) => {\n  nitroApp.hooks.hook('evlog:emit:keep', (ctx) => {\n    if (ctx.context.user?.plan === 'enterprise') {\n      ctx.shouldKeep = true\n    }\n  })\n})\n","server\u002Fplugins\u002Fsampling.ts (Nuxt)",[697,1697,1698,1722,1760,1800,1816,1821,1828],{"__ignoreMap":695},[643,1699,1700,1702,1704,1707,1709,1711,1715,1717,1720],{"class":701,"line":702},[643,1701,706],{"class":705},[643,1703,709],{"class":705},[643,1705,1706],{"class":712}," defineNitroPlugin",[643,1708,717],{"class":716},[643,1710,717],{"class":720},[643,1712,1714],{"class":1713},"sHdIc","nitroApp",[643,1716,1419],{"class":720},[643,1718,1719],{"class":919}," =>",[643,1721,760],{"class":720},[643,1723,1724,1727,1730,1733,1735,1738,1740,1742,1744,1746,1748,1751,1754,1756,1758],{"class":701,"line":724},[643,1725,1726],{"class":716},"  nitroApp",[643,1728,1729],{"class":720},".",[643,1731,1732],{"class":716},"hooks",[643,1734,1729],{"class":720},[643,1736,1737],{"class":712},"hook",[643,1739,717],{"class":727},[643,1741,737],{"class":720},[643,1743,1685],{"class":740},[643,1745,737],{"class":720},[643,1747,795],{"class":720},[643,1749,1750],{"class":720}," (",[643,1752,1753],{"class":1713},"ctx",[643,1755,1419],{"class":720},[643,1757,1719],{"class":919},[643,1759,760],{"class":720},[643,1761,1762,1765,1767,1769,1771,1774,1776,1779,1782,1785,1788,1790,1793,1795,1798],{"class":701,"line":752},[643,1763,1764],{"class":705},"    if",[643,1766,1750],{"class":727},[643,1768,1753],{"class":716},[643,1770,1729],{"class":720},[643,1772,1773],{"class":716},"context",[643,1775,1729],{"class":720},[643,1777,1778],{"class":716},"user",[643,1780,1781],{"class":720},"?.",[643,1783,1784],{"class":716},"plan",[643,1786,1787],{"class":720}," ===",[643,1789,900],{"class":720},[643,1791,1792],{"class":740},"enterprise",[643,1794,737],{"class":720},[643,1796,1797],{"class":727},") ",[643,1799,721],{"class":720},[643,1801,1802,1805,1807,1810,1812],{"class":701,"line":763},[643,1803,1804],{"class":716},"      ctx",[643,1806,1729],{"class":720},[643,1808,1809],{"class":716},"shouldKeep",[643,1811,935],{"class":720},[643,1813,1815],{"class":1814},"sfNiH"," true\n",[643,1817,1818],{"class":701,"line":773},[643,1819,1820],{"class":720},"    }\n",[643,1822,1823,1826],{"class":701,"line":783},[643,1824,1825],{"class":720},"  }",[643,1827,874],{"class":727},[643,1829,1830,1832],{"class":701,"line":802},[643,1831,871],{"class":720},[643,1833,874],{"class":716},[689,1835,1837],{"className":691,"code":1836,"filename":878,"language":694,"meta":695,"style":695},"import { createEvlog } from 'evlog\u002Fnext'\n\nexport const { withEvlog, useLogger } = createEvlog({\n  service: 'my-app',\n  sampling: {\n    rates: { info: 10 },\n    keep: [{ status: 400 }],\n  },\n  keep(ctx) {\n    if (ctx.context.user?.plan === 'enterprise') {\n      ctx.shouldKeep = true\n    }\n  },\n})\n",[697,1838,1839,1857,1861,1885,1899,1907,1923,1946,1950,1962,1994,2006,2010,2014],{"__ignoreMap":695},[643,1840,1841,1843,1845,1847,1849,1851,1853,1855],{"class":701,"line":702},[643,1842,885],{"class":705},[643,1844,888],{"class":720},[643,1846,891],{"class":716},[643,1848,894],{"class":720},[643,1850,897],{"class":705},[643,1852,900],{"class":720},[643,1854,903],{"class":740},[643,1856,906],{"class":720},[643,1858,1859],{"class":701,"line":724},[643,1860,912],{"emptyLinePlaceholder":911},[643,1862,1863,1865,1867,1869,1871,1873,1875,1877,1879,1881,1883],{"class":701,"line":752},[643,1864,706],{"class":705},[643,1866,920],{"class":919},[643,1868,888],{"class":720},[643,1870,925],{"class":716},[643,1872,795],{"class":720},[643,1874,930],{"class":716},[643,1876,871],{"class":720},[643,1878,935],{"class":720},[643,1880,891],{"class":712},[643,1882,717],{"class":716},[643,1884,721],{"class":720},[643,1886,1887,1889,1891,1893,1895,1897],{"class":701,"line":763},[643,1888,946],{"class":727},[643,1890,731],{"class":720},[643,1892,900],{"class":720},[643,1894,953],{"class":740},[643,1896,737],{"class":720},[643,1898,749],{"class":720},[643,1900,1901,1903,1905],{"class":701,"line":773},[643,1902,962],{"class":727},[643,1904,731],{"class":720},[643,1906,760],{"class":720},[643,1908,1909,1911,1913,1915,1917,1919,1921],{"class":701,"line":783},[643,1910,971],{"class":727},[643,1912,731],{"class":720},[643,1914,888],{"class":720},[643,1916,1230],{"class":727},[643,1918,731],{"class":720},[643,1920,792],{"class":791},[643,1922,1095],{"class":720},[643,1924,1925,1927,1929,1931,1934,1936,1938,1940,1942,1944],{"class":701,"line":802},[643,1926,1241],{"class":727},[643,1928,731],{"class":720},[643,1930,734],{"class":716},[643,1932,1933],{"class":720},"{",[643,1935,1254],{"class":727},[643,1937,731],{"class":720},[643,1939,1259],{"class":791},[643,1941,894],{"class":720},[643,1943,746],{"class":716},[643,1945,749],{"class":720},[643,1947,1948],{"class":701,"line":818},[643,1949,865],{"class":720},[643,1951,1952,1954,1956,1958,1960],{"class":701,"line":834},[643,1953,1508],{"class":727},[643,1955,717],{"class":720},[643,1957,1753],{"class":1713},[643,1959,1419],{"class":720},[643,1961,760],{"class":720},[643,1963,1964,1966,1968,1970,1972,1974,1976,1978,1980,1982,1984,1986,1988,1990,1992],{"class":701,"line":850},[643,1965,1764],{"class":705},[643,1967,1750],{"class":727},[643,1969,1753],{"class":716},[643,1971,1729],{"class":720},[643,1973,1773],{"class":716},[643,1975,1729],{"class":720},[643,1977,1778],{"class":716},[643,1979,1781],{"class":720},[643,1981,1784],{"class":716},[643,1983,1787],{"class":720},[643,1985,900],{"class":720},[643,1987,1792],{"class":740},[643,1989,737],{"class":720},[643,1991,1797],{"class":727},[643,1993,721],{"class":720},[643,1995,1996,1998,2000,2002,2004],{"class":701,"line":856},[643,1997,1804],{"class":716},[643,1999,1729],{"class":720},[643,2001,1809],{"class":716},[643,2003,935],{"class":720},[643,2005,1815],{"class":1814},[643,2007,2008],{"class":701,"line":862},[643,2009,1820],{"class":720},[643,2011,2012],{"class":701,"line":868},[643,2013,865],{"class":720},[643,2015,2017,2019],{"class":701,"line":2016},14,[643,2018,871],{"class":720},[643,2020,874],{"class":716},[689,2022,2025],{"className":691,"code":2023,"filename":2024,"language":694,"meta":695,"style":695},"import { evlog } from 'evlog\u002Fhono'\n\napp.use(evlog({\n  keep(ctx) {\n    if (ctx.context.user?.plan === 'enterprise') {\n      ctx.shouldKeep = true\n    }\n  },\n}))\n","index.ts (Hono)",[697,2026,2027,2047,2051,2069,2081,2113,2125,2129,2133],{"__ignoreMap":695},[643,2028,2029,2031,2033,2036,2038,2040,2042,2045],{"class":701,"line":702},[643,2030,885],{"class":705},[643,2032,888],{"class":720},[643,2034,2035],{"class":716}," evlog",[643,2037,894],{"class":720},[643,2039,897],{"class":705},[643,2041,900],{"class":720},[643,2043,2044],{"class":740},"evlog\u002Fhono",[643,2046,906],{"class":720},[643,2048,2049],{"class":701,"line":724},[643,2050,912],{"emptyLinePlaceholder":911},[643,2052,2053,2056,2058,2061,2063,2065,2067],{"class":701,"line":752},[643,2054,2055],{"class":716},"app",[643,2057,1729],{"class":720},[643,2059,2060],{"class":712},"use",[643,2062,717],{"class":716},[643,2064,1057],{"class":712},[643,2066,717],{"class":716},[643,2068,721],{"class":720},[643,2070,2071,2073,2075,2077,2079],{"class":701,"line":763},[643,2072,1508],{"class":727},[643,2074,717],{"class":720},[643,2076,1753],{"class":1713},[643,2078,1419],{"class":720},[643,2080,760],{"class":720},[643,2082,2083,2085,2087,2089,2091,2093,2095,2097,2099,2101,2103,2105,2107,2109,2111],{"class":701,"line":773},[643,2084,1764],{"class":705},[643,2086,1750],{"class":727},[643,2088,1753],{"class":716},[643,2090,1729],{"class":720},[643,2092,1773],{"class":716},[643,2094,1729],{"class":720},[643,2096,1778],{"class":716},[643,2098,1781],{"class":720},[643,2100,1784],{"class":716},[643,2102,1787],{"class":720},[643,2104,900],{"class":720},[643,2106,1792],{"class":740},[643,2108,737],{"class":720},[643,2110,1797],{"class":727},[643,2112,721],{"class":720},[643,2114,2115,2117,2119,2121,2123],{"class":701,"line":783},[643,2116,1804],{"class":716},[643,2118,1729],{"class":720},[643,2120,1809],{"class":716},[643,2122,935],{"class":720},[643,2124,1815],{"class":1814},[643,2126,2127],{"class":701,"line":802},[643,2128,1820],{"class":720},[643,2130,2131],{"class":701,"line":818},[643,2132,865],{"class":720},[643,2134,2135,2137],{"class":701,"line":834},[643,2136,871],{"class":720},[643,2138,2139],{"class":716},"))\n",[618,2141,2142,2143,2145],{},"The ",[697,2144,1753],{}," object contains:",[1349,2147,2148,2159],{},[1352,2149,2150],{},[1355,2151,2152,2155,2157],{},[1358,2153,2154],{},"Field",[1358,2156,1363],{},[1358,2158,1366],{},[1368,2160,2161,2175,2188,2202,2216,2233],{},[1355,2162,2163,2167,2172],{},[1373,2164,2165],{},[697,2166,1329],{},[1373,2168,2169],{},[697,2170,2171],{},"number | undefined",[1373,2173,2174],{},"HTTP response status",[1355,2176,2177,2181,2185],{},[1373,2178,2179],{},[697,2180,1333],{},[1373,2182,2183],{},[697,2184,2171],{},[1373,2186,2187],{},"Request duration in ms",[1355,2189,2190,2194,2199],{},[1373,2191,2192],{},[697,2193,1337],{},[1373,2195,2196],{},[697,2197,2198],{},"string | undefined",[1373,2200,2201],{},"Request path",[1355,2203,2204,2209,2213],{},[1373,2205,2206],{},[697,2207,2208],{},"method",[1373,2210,2211],{},[697,2212,2198],{},[1373,2214,2215],{},"HTTP method",[1355,2217,2218,2222,2227],{},[1373,2219,2220],{},[697,2221,1773],{},[1373,2223,2224],{},[697,2225,2226],{},"Record\u003Cstring, unknown>",[1373,2228,2229,2230],{},"All fields set via ",[697,2231,2232],{},"log.set()",[1355,2234,2235,2239,2244],{},[1373,2236,2237],{},[697,2238,1809],{},[1373,2240,2241],{},[697,2242,2243],{},"boolean",[1373,2245,2246,2247,2250],{},"Set to ",[697,2248,2249],{},"true"," to force-keep",[670,2252,2254],{"id":2253},"a-configuration-that-ships","A configuration that ships",[618,2256,2257],{},"A typical production configuration that balances cost and visibility:",[686,2259,2260,2515,2720],{},[689,2261,2263],{"className":691,"code":2262,"filename":693,"language":694,"meta":695,"style":695},"export default defineNuxtConfig({\n  modules: ['evlog\u002Fnuxt'],\n  evlog: {\n    env: { service: 'my-app' },\n  },\n  $production: {\n    evlog: {\n      sampling: {\n        rates: {\n          info: 10,\n          warn: 50,\n          debug: 0,\n          error: 100,\n        },\n        keep: [\n          { status: 400 },\n          { duration: 1000 },\n          { path: '\u002Fapi\u002Fpayments\u002F**' },\n          { path: '\u002Fapi\u002Fauth\u002F**' },\n        ],\n      },\n    },\n  },\n})\n",[697,2264,2265,2277,2295,2303,2324,2328,2337,2346,2355,2364,2375,2386,2397,2408,2413,2423,2437,2450,2467,2485,2493,2498,2503,2508],{"__ignoreMap":695},[643,2266,2267,2269,2271,2273,2275],{"class":701,"line":702},[643,2268,706],{"class":705},[643,2270,709],{"class":705},[643,2272,713],{"class":712},[643,2274,717],{"class":716},[643,2276,721],{"class":720},[643,2278,2279,2281,2283,2285,2287,2289,2291,2293],{"class":701,"line":724},[643,2280,728],{"class":727},[643,2282,731],{"class":720},[643,2284,734],{"class":716},[643,2286,737],{"class":720},[643,2288,741],{"class":740},[643,2290,737],{"class":720},[643,2292,746],{"class":716},[643,2294,749],{"class":720},[643,2296,2297,2299,2301],{"class":701,"line":752},[643,2298,755],{"class":727},[643,2300,731],{"class":720},[643,2302,760],{"class":720},[643,2304,2305,2308,2310,2312,2314,2316,2318,2320,2322],{"class":701,"line":763},[643,2306,2307],{"class":727},"    env",[643,2309,731],{"class":720},[643,2311,888],{"class":720},[643,2313,1084],{"class":727},[643,2315,731],{"class":720},[643,2317,900],{"class":720},[643,2319,953],{"class":740},[643,2321,737],{"class":720},[643,2323,1095],{"class":720},[643,2325,2326],{"class":701,"line":773},[643,2327,865],{"class":720},[643,2329,2330,2333,2335],{"class":701,"line":783},[643,2331,2332],{"class":727},"  $production",[643,2334,731],{"class":720},[643,2336,760],{"class":720},[643,2338,2339,2342,2344],{"class":701,"line":802},[643,2340,2341],{"class":727},"    evlog",[643,2343,731],{"class":720},[643,2345,760],{"class":720},[643,2347,2348,2351,2353],{"class":701,"line":818},[643,2349,2350],{"class":727},"      sampling",[643,2352,731],{"class":720},[643,2354,760],{"class":720},[643,2356,2357,2360,2362],{"class":701,"line":834},[643,2358,2359],{"class":727},"        rates",[643,2361,731],{"class":720},[643,2363,760],{"class":720},[643,2365,2366,2369,2371,2373],{"class":701,"line":850},[643,2367,2368],{"class":727},"          info",[643,2370,731],{"class":720},[643,2372,792],{"class":791},[643,2374,749],{"class":720},[643,2376,2377,2380,2382,2384],{"class":701,"line":856},[643,2378,2379],{"class":727},"          warn",[643,2381,731],{"class":720},[643,2383,810],{"class":791},[643,2385,749],{"class":720},[643,2387,2388,2391,2393,2395],{"class":701,"line":862},[643,2389,2390],{"class":727},"          debug",[643,2392,731],{"class":720},[643,2394,826],{"class":791},[643,2396,749],{"class":720},[643,2398,2399,2402,2404,2406],{"class":701,"line":868},[643,2400,2401],{"class":727},"          error",[643,2403,731],{"class":720},[643,2405,842],{"class":791},[643,2407,749],{"class":720},[643,2409,2410],{"class":701,"line":2016},[643,2411,2412],{"class":720},"        },\n",[643,2414,2416,2419,2421],{"class":701,"line":2415},15,[643,2417,2418],{"class":727},"        keep",[643,2420,731],{"class":720},[643,2422,1246],{"class":716},[643,2424,2426,2429,2431,2433,2435],{"class":701,"line":2425},16,[643,2427,2428],{"class":720},"          {",[643,2430,1254],{"class":727},[643,2432,731],{"class":720},[643,2434,1259],{"class":791},[643,2436,1095],{"class":720},[643,2438,2440,2442,2444,2446,2448],{"class":701,"line":2439},17,[643,2441,2428],{"class":720},[643,2443,1272],{"class":727},[643,2445,731],{"class":720},[643,2447,1277],{"class":791},[643,2449,1095],{"class":720},[643,2451,2453,2455,2457,2459,2461,2463,2465],{"class":701,"line":2452},18,[643,2454,2428],{"class":720},[643,2456,1289],{"class":727},[643,2458,731],{"class":720},[643,2460,900],{"class":720},[643,2462,1296],{"class":740},[643,2464,737],{"class":720},[643,2466,1095],{"class":720},[643,2468,2470,2472,2474,2476,2478,2481,2483],{"class":701,"line":2469},19,[643,2471,2428],{"class":720},[643,2473,1289],{"class":727},[643,2475,731],{"class":720},[643,2477,900],{"class":720},[643,2479,2480],{"class":740},"\u002Fapi\u002Fauth\u002F**",[643,2482,737],{"class":720},[643,2484,1095],{"class":720},[643,2486,2488,2491],{"class":701,"line":2487},20,[643,2489,2490],{"class":716},"        ]",[643,2492,749],{"class":720},[643,2494,2496],{"class":701,"line":2495},21,[643,2497,853],{"class":720},[643,2499,2501],{"class":701,"line":2500},22,[643,2502,859],{"class":720},[643,2504,2506],{"class":701,"line":2505},23,[643,2507,865],{"class":720},[643,2509,2511,2513],{"class":701,"line":2510},24,[643,2512,871],{"class":720},[643,2514,874],{"class":716},[689,2516,2518],{"className":691,"code":2517,"filename":878,"language":694,"meta":695,"style":695},"import { createEvlog } from 'evlog\u002Fnext'\n\nexport const { withEvlog, useLogger } = createEvlog({\n  service: 'my-app',\n  sampling: {\n    rates: {\n      info: 10,\n      warn: 50,\n      debug: 0,\n      error: 100,\n    },\n    keep: [\n      { status: 400 },\n      { duration: 1000 },\n      { path: '\u002Fapi\u002Fpayments\u002F**' },\n      { path: '\u002Fapi\u002Fauth\u002F**' },\n    ],\n  },\n})\n",[697,2519,2520,2538,2542,2566,2580,2588,2596,2606,2616,2626,2636,2640,2648,2660,2672,2688,2704,2710,2714],{"__ignoreMap":695},[643,2521,2522,2524,2526,2528,2530,2532,2534,2536],{"class":701,"line":702},[643,2523,885],{"class":705},[643,2525,888],{"class":720},[643,2527,891],{"class":716},[643,2529,894],{"class":720},[643,2531,897],{"class":705},[643,2533,900],{"class":720},[643,2535,903],{"class":740},[643,2537,906],{"class":720},[643,2539,2540],{"class":701,"line":724},[643,2541,912],{"emptyLinePlaceholder":911},[643,2543,2544,2546,2548,2550,2552,2554,2556,2558,2560,2562,2564],{"class":701,"line":752},[643,2545,706],{"class":705},[643,2547,920],{"class":919},[643,2549,888],{"class":720},[643,2551,925],{"class":716},[643,2553,795],{"class":720},[643,2555,930],{"class":716},[643,2557,871],{"class":720},[643,2559,935],{"class":720},[643,2561,891],{"class":712},[643,2563,717],{"class":716},[643,2565,721],{"class":720},[643,2567,2568,2570,2572,2574,2576,2578],{"class":701,"line":763},[643,2569,946],{"class":727},[643,2571,731],{"class":720},[643,2573,900],{"class":720},[643,2575,953],{"class":740},[643,2577,737],{"class":720},[643,2579,749],{"class":720},[643,2581,2582,2584,2586],{"class":701,"line":773},[643,2583,962],{"class":727},[643,2585,731],{"class":720},[643,2587,760],{"class":720},[643,2589,2590,2592,2594],{"class":701,"line":783},[643,2591,971],{"class":727},[643,2593,731],{"class":720},[643,2595,760],{"class":720},[643,2597,2598,2600,2602,2604],{"class":701,"line":802},[643,2599,980],{"class":727},[643,2601,731],{"class":720},[643,2603,792],{"class":791},[643,2605,749],{"class":720},[643,2607,2608,2610,2612,2614],{"class":701,"line":818},[643,2609,991],{"class":727},[643,2611,731],{"class":720},[643,2613,810],{"class":791},[643,2615,749],{"class":720},[643,2617,2618,2620,2622,2624],{"class":701,"line":834},[643,2619,1002],{"class":727},[643,2621,731],{"class":720},[643,2623,826],{"class":791},[643,2625,749],{"class":720},[643,2627,2628,2630,2632,2634],{"class":701,"line":850},[643,2629,1013],{"class":727},[643,2631,731],{"class":720},[643,2633,842],{"class":791},[643,2635,749],{"class":720},[643,2637,2638],{"class":701,"line":856},[643,2639,859],{"class":720},[643,2641,2642,2644,2646],{"class":701,"line":862},[643,2643,1241],{"class":727},[643,2645,731],{"class":720},[643,2647,1246],{"class":716},[643,2649,2650,2652,2654,2656,2658],{"class":701,"line":868},[643,2651,1251],{"class":720},[643,2653,1254],{"class":727},[643,2655,731],{"class":720},[643,2657,1259],{"class":791},[643,2659,1095],{"class":720},[643,2661,2662,2664,2666,2668,2670],{"class":701,"line":2016},[643,2663,1251],{"class":720},[643,2665,1272],{"class":727},[643,2667,731],{"class":720},[643,2669,1277],{"class":791},[643,2671,1095],{"class":720},[643,2673,2674,2676,2678,2680,2682,2684,2686],{"class":701,"line":2415},[643,2675,1251],{"class":720},[643,2677,1289],{"class":727},[643,2679,731],{"class":720},[643,2681,900],{"class":720},[643,2683,1296],{"class":740},[643,2685,737],{"class":720},[643,2687,1095],{"class":720},[643,2689,2690,2692,2694,2696,2698,2700,2702],{"class":701,"line":2425},[643,2691,1251],{"class":720},[643,2693,1289],{"class":727},[643,2695,731],{"class":720},[643,2697,900],{"class":720},[643,2699,2480],{"class":740},[643,2701,737],{"class":720},[643,2703,1095],{"class":720},[643,2705,2706,2708],{"class":701,"line":2439},[643,2707,1308],{"class":716},[643,2709,749],{"class":720},[643,2711,2712],{"class":701,"line":2452},[643,2713,865],{"class":720},[643,2715,2716,2718],{"class":701,"line":2469},[643,2717,871],{"class":720},[643,2719,874],{"class":716},[689,2721,2723],{"className":691,"code":2722,"filename":1037,"language":694,"meta":695,"style":695},"import { initLogger } from 'evlog'\n\ninitLogger({\n  env: { service: 'my-app' },\n  sampling: {\n    rates: {\n      info: 10,\n      warn: 50,\n      debug: 0,\n      error: 100,\n    },\n    keep: [\n      { status: 400 },\n      { duration: 1000 },\n      { path: '\u002Fapi\u002Fpayments\u002F**' },\n      { path: '\u002Fapi\u002Fauth\u002F**' },\n    ],\n  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Nuxt, use the ",[697,2921,2922],{},"$production"," override to keep full logging in development while sampling in production. 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