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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.",[535,536,539,542,568],"prompt",{":actions":537,"description":538,"icon":64},"[\"copy\",\"cursor\",\"claude\"]","Enable head and tail sampling",[531,540,541],{},"Enable head and tail sampling in my evlog production config.",[543,544,545,549,552,559,562,565],"ul",{},[546,547,548],"li",{},"Identify my framework and locate the evlog config (nuxt.config.ts, lib\u002Fevlog.ts, initLogger, etc.)",[546,550,551],{},"Configure sampling.rates per level: { info: 10, warn: 50, debug: 0, error: 100 } as a starting point",[546,553,554,555],{},"Add sampling.keep rules to force-keep critical events: ",[556,557,558],"span",{},"{ status: 400 }, { duration: 1000 }, { path: '\u002Fapi\u002Fcritical\u002F**' }",[546,560,561],{},"For business-specific keep logic (e.g. premium users), add a custom keep callback or evlog:emit:keep hook",[546,563,564],{},"Wrap sampling in a $production override so dev keeps full logging",[546,566,567],{},"Confirm errors are always kept by default unless I explicitly set error: 0",[531,569,570,571,577,578],{},"Docs: ",[572,573,574],"a",{"href":574,"rel":575},"https:\u002F\u002Fwww.evlog.dev\u002Flearn\u002Fsampling",[576],"nofollow","\nBest practices: ",[572,579,580],{"href":580,"rel":581},"https:\u002F\u002Fwww.evlog.dev\u002Freference\u002Fbest-practices",[576],[583,584,586],"h2",{"id":585},"head-sampling","Head Sampling",[531,588,589,590,594],{},"Head sampling randomly keeps a percentage of logs per level. It runs ",[591,592,593],"strong",{},"before"," the request completes, acting as a coin flip at emission time.",[596,597],"head-sampling-plinko",{},[599,600,601,788,947],"code-group",{},[602,603,609],"pre",{"className":604,"code":605,"filename":606,"language":607,"meta":608,"style":608},"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","",[610,611,612,635,663,674,684,694,713,729,745,761,767,773,779],"code",{"__ignoreMap":608},[556,613,616,620,623,627,631],{"class":614,"line":615},"line",1,[556,617,619],{"class":618},"s7zQu","export",[556,621,622],{"class":618}," default",[556,624,626],{"class":625},"s2Zo4"," defineNuxtConfig",[556,628,630],{"class":629},"sTEyZ","(",[556,632,634],{"class":633},"sMK4o","{\n",[556,636,638,642,645,648,651,655,657,660],{"class":614,"line":637},2,[556,639,641],{"class":640},"swJcz","  modules",[556,643,644],{"class":633},":",[556,646,647],{"class":629}," [",[556,649,650],{"class":633},"'",[556,652,654],{"class":653},"sfazB","evlog\u002Fnuxt",[556,656,650],{"class":633},[556,658,659],{"class":629},"]",[556,661,662],{"class":633},",\n",[556,664,666,669,671],{"class":614,"line":665},3,[556,667,668],{"class":640},"  evlog",[556,670,644],{"class":633},[556,672,673],{"class":633}," {\n",[556,675,677,680,682],{"class":614,"line":676},4,[556,678,679],{"class":640},"    sampling",[556,681,644],{"class":633},[556,683,673],{"class":633},[556,685,687,690,692],{"class":614,"line":686},5,[556,688,689],{"class":640},"      rates",[556,691,644],{"class":633},[556,693,673],{"class":633},[556,695,697,700,702,706,709],{"class":614,"line":696},6,[556,698,699],{"class":640},"        info",[556,701,644],{"class":633},[556,703,705],{"class":704},"sbssI"," 10",[556,707,708],{"class":633},",",[556,710,712],{"class":711},"sHwdD","    \u002F\u002F Keep 10% of info logs\n",[556,714,716,719,721,724,726],{"class":614,"line":715},7,[556,717,718],{"class":640},"        warn",[556,720,644],{"class":633},[556,722,723],{"class":704}," 50",[556,725,708],{"class":633},[556,727,728],{"class":711},"    \u002F\u002F Keep 50% of warnings\n",[556,730,732,735,737,740,742],{"class":614,"line":731},8,[556,733,734],{"class":640},"        debug",[556,736,644],{"class":633},[556,738,739],{"class":704}," 0",[556,741,708],{"class":633},[556,743,744],{"class":711},"    \u002F\u002F Drop all debug logs\n",[556,746,748,751,753,756,758],{"class":614,"line":747},9,[556,749,750],{"class":640},"        error",[556,752,644],{"class":633},[556,754,755],{"class":704}," 100",[556,757,708],{"class":633},[556,759,760],{"class":711},"  \u002F\u002F Always keep errors (default)\n",[556,762,764],{"class":614,"line":763},10,[556,765,766],{"class":633},"      },\n",[556,768,770],{"class":614,"line":769},11,[556,771,772],{"class":633},"    },\n",[556,774,776],{"class":614,"line":775},12,[556,777,778],{"class":633},"  },\n",[556,780,782,785],{"class":614,"line":781},13,[556,783,784],{"class":633},"}",[556,786,787],{"class":629},")\n",[602,789,792],{"className":604,"code":790,"filename":791,"language":607,"meta":608,"style":608},"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)",[610,793,794,820,826,855,871,880,889,900,911,922,933,937,941],{"__ignoreMap":608},[556,795,796,799,802,805,808,811,814,817],{"class":614,"line":615},[556,797,798],{"class":618},"import",[556,800,801],{"class":633}," {",[556,803,804],{"class":629}," createEvlog",[556,806,807],{"class":633}," }",[556,809,810],{"class":618}," from",[556,812,813],{"class":633}," '",[556,815,816],{"class":653},"evlog\u002Fnext",[556,818,819],{"class":633},"'\n",[556,821,822],{"class":614,"line":637},[556,823,825],{"emptyLinePlaceholder":824},true,"\n",[556,827,828,830,834,836,839,841,844,846,849,851,853],{"class":614,"line":665},[556,829,619],{"class":618},[556,831,833],{"class":832},"spNyl"," const",[556,835,801],{"class":633},[556,837,838],{"class":629}," withEvlog",[556,840,708],{"class":633},[556,842,843],{"class":629}," useLogger ",[556,845,784],{"class":633},[556,847,848],{"class":633}," =",[556,850,804],{"class":625},[556,852,630],{"class":629},[556,854,634],{"class":633},[556,856,857,860,862,864,867,869],{"class":614,"line":676},[556,858,859],{"class":640},"  service",[556,861,644],{"class":633},[556,863,813],{"class":633},[556,865,866],{"class":653},"my-app",[556,868,650],{"class":633},[556,870,662],{"class":633},[556,872,873,876,878],{"class":614,"line":686},[556,874,875],{"class":640},"  sampling",[556,877,644],{"class":633},[556,879,673],{"class":633},[556,881,882,885,887],{"class":614,"line":696},[556,883,884],{"class":640},"    rates",[556,886,644],{"class":633},[556,888,673],{"class":633},[556,890,891,894,896,898],{"class":614,"line":715},[556,892,893],{"class":640},"      info",[556,895,644],{"class":633},[556,897,705],{"class":704},[556,899,662],{"class":633},[556,901,902,905,907,909],{"class":614,"line":731},[556,903,904],{"class":640},"      warn",[556,906,644],{"class":633},[556,908,723],{"class":704},[556,910,662],{"class":633},[556,912,913,916,918,920],{"class":614,"line":747},[556,914,915],{"class":640},"      debug",[556,917,644],{"class":633},[556,919,739],{"class":704},[556,921,662],{"class":633},[556,923,924,927,929,931],{"class":614,"line":763},[556,925,926],{"class":640},"      error",[556,928,644],{"class":633},[556,930,755],{"class":704},[556,932,662],{"class":633},[556,934,935],{"class":614,"line":769},[556,936,772],{"class":633},[556,938,939],{"class":614,"line":775},[556,940,778],{"class":633},[556,942,943,945],{"class":614,"line":781},[556,944,784],{"class":633},[556,946,787],{"class":629},[602,948,951],{"className":604,"code":949,"filename":950,"language":607,"meta":608,"style":608},"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)",[610,952,953,973,977,986,1009,1017,1025,1035,1045,1055,1065,1069,1073],{"__ignoreMap":608},[556,954,955,957,959,962,964,966,968,971],{"class":614,"line":615},[556,956,798],{"class":618},[556,958,801],{"class":633},[556,960,961],{"class":629}," initLogger",[556,963,807],{"class":633},[556,965,810],{"class":618},[556,967,813],{"class":633},[556,969,970],{"class":653},"evlog",[556,972,819],{"class":633},[556,974,975],{"class":614,"line":637},[556,976,825],{"emptyLinePlaceholder":824},[556,978,979,982,984],{"class":614,"line":665},[556,980,981],{"class":625},"initLogger",[556,983,630],{"class":629},[556,985,634],{"class":633},[556,987,988,991,993,995,998,1000,1002,1004,1006],{"class":614,"line":676},[556,989,990],{"class":640},"  env",[556,992,644],{"class":633},[556,994,801],{"class":633},[556,996,997],{"class":640}," service",[556,999,644],{"class":633},[556,1001,813],{"class":633},[556,1003,866],{"class":653},[556,1005,650],{"class":633},[556,1007,1008],{"class":633}," },\n",[556,1010,1011,1013,1015],{"class":614,"line":686},[556,1012,875],{"class":640},[556,1014,644],{"class":633},[556,1016,673],{"class":633},[556,1018,1019,1021,1023],{"class":614,"line":696},[556,1020,884],{"class":640},[556,1022,644],{"class":633},[556,1024,673],{"class":633},[556,1026,1027,1029,1031,1033],{"class":614,"line":715},[556,1028,893],{"class":640},[556,1030,644],{"class":633},[556,1032,705],{"class":704},[556,1034,662],{"class":633},[556,1036,1037,1039,1041,1043],{"class":614,"line":731},[556,1038,904],{"class":640},[556,1040,644],{"class":633},[556,1042,723],{"class":704},[556,1044,662],{"class":633},[556,1046,1047,1049,1051,1053],{"class":614,"line":747},[556,1048,915],{"class":640},[556,1050,644],{"class":633},[556,1052,739],{"class":704},[556,1054,662],{"class":633},[556,1056,1057,1059,1061,1063],{"class":614,"line":763},[556,1058,926],{"class":640},[556,1060,644],{"class":633},[556,1062,755],{"class":704},[556,1064,662],{"class":633},[556,1066,1067],{"class":614,"line":769},[556,1068,772],{"class":633},[556,1070,1071],{"class":614,"line":775},[556,1072,778],{"class":633},[556,1074,1075,1077],{"class":614,"line":781},[556,1076,784],{"class":633},[556,1078,787],{"class":629},[531,1080,1081,1082,1085],{},"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 ",[610,1083,1084],{},"error: 0"," to drop errors.",[1087,1088,1090,1091,1094],"callout",{"color":1089,"icon":13},"info","Head sampling is random. A ",[610,1092,1093],{},"10%"," rate means roughly 1 in 10 info logs are kept, not exactly 1 in 10.",[583,1096,1098],{"id":1097},"tail-sampling","Tail Sampling",[531,1100,1101,1102,1105],{},"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 ",[591,1103,1104],{},"after"," the request completes and force-keeping logs that match specific conditions.",[602,1107,1109],{"className":604,"code":1108,"filename":606,"language":607,"meta":608,"style":608},"\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",[610,1110,1111,1116,1125,1133,1150,1160,1179,1196,1217,1224,1228],{"__ignoreMap":608},[556,1112,1113],{"class":614,"line":615},[556,1114,1115],{"class":711},"\u002F\u002F Sampling config, works the same across all frameworks\n",[556,1117,1118,1121,1123],{"class":614,"line":637},[556,1119,970],{"class":1120},"sBMFI",[556,1122,644],{"class":633},[556,1124,673],{"class":633},[556,1126,1127,1129,1131],{"class":614,"line":665},[556,1128,875],{"class":1120},[556,1130,644],{"class":633},[556,1132,673],{"class":633},[556,1134,1135,1137,1139,1141,1144,1146,1148],{"class":614,"line":676},[556,1136,884],{"class":1120},[556,1138,644],{"class":633},[556,1140,801],{"class":633},[556,1142,1143],{"class":1120}," info",[556,1145,644],{"class":633},[556,1147,705],{"class":704},[556,1149,1008],{"class":633},[556,1151,1152,1155,1157],{"class":614,"line":686},[556,1153,1154],{"class":1120},"    keep",[556,1156,644],{"class":633},[556,1158,1159],{"class":640}," [\n",[556,1161,1162,1165,1168,1170,1173,1176],{"class":614,"line":696},[556,1163,1164],{"class":633},"      {",[556,1166,1167],{"class":640}," status",[556,1169,644],{"class":633},[556,1171,1172],{"class":704}," 400",[556,1174,1175],{"class":633}," },",[556,1177,1178],{"class":711},"              \u002F\u002F HTTP status >= 400\n",[556,1180,1181,1183,1186,1188,1191,1193],{"class":614,"line":715},[556,1182,1164],{"class":633},[556,1184,1185],{"class":640}," duration",[556,1187,644],{"class":633},[556,1189,1190],{"class":704}," 1000",[556,1192,1175],{"class":633},[556,1194,1195],{"class":711},"           \u002F\u002F Request took >= 1s\n",[556,1197,1198,1200,1203,1205,1207,1210,1212,1214],{"class":614,"line":731},[556,1199,1164],{"class":633},[556,1201,1202],{"class":640}," path",[556,1204,644],{"class":633},[556,1206,813],{"class":633},[556,1208,1209],{"class":653},"\u002Fapi\u002Fpayments\u002F**",[556,1211,650],{"class":633},[556,1213,1175],{"class":633},[556,1215,1216],{"class":711}," \u002F\u002F Critical path (glob)\n",[556,1218,1219,1222],{"class":614,"line":747},[556,1220,1221],{"class":640},"    ]",[556,1223,662],{"class":633},[556,1225,1226],{"class":614,"line":763},[556,1227,778],{"class":633},[556,1229,1230],{"class":614,"line":769},[556,1231,1232],{"class":633},"}\n",[531,1234,1235,1236,1239,1240,1243,1244,1247,1248,1251,1252,1255],{},"Conditions use ",[591,1237,1238],{},">="," comparison for ",[610,1241,1242],{},"status"," and ",[610,1245,1246],{},"duration",", and glob matching for ",[610,1249,1250],{},"path",". If ",[591,1253,1254],{},"any"," condition matches, the log is kept regardless of head sampling (OR logic).",[1257,1258,1260],"h3",{"id":1259},"available-conditions","Available Conditions",[1262,1263,1264,1280],"table",{},[1265,1266,1267],"thead",{},[1268,1269,1270,1274,1277],"tr",{},[1271,1272,1273],"th",{},"Condition",[1271,1275,1276],{},"Type",[1271,1278,1279],{},"Description",[1281,1282,1283,1302,1315],"tbody",{},[1268,1284,1285,1290,1295],{},[1286,1287,1288],"td",{},[610,1289,1242],{},[1286,1291,1292],{},[610,1293,1294],{},"number",[1286,1296,1297,1298,1301],{},"Keep if HTTP status >= value (e.g., ",[610,1299,1300],{},"400"," catches all 4xx and 5xx)",[1268,1303,1304,1308,1312],{},[1286,1305,1306],{},[610,1307,1246],{},[1286,1309,1310],{},[610,1311,1294],{},[1286,1313,1314],{},"Keep if request duration >= value in milliseconds",[1268,1316,1317,1321,1326],{},[1286,1318,1319],{},[610,1320,1250],{},[1286,1322,1323],{},[610,1324,1325],{},"string",[1286,1327,1328,1329,1332],{},"Keep if request path matches glob pattern (e.g., ",[610,1330,1331],{},"'\u002Fapi\u002Fcritical\u002F**'",")",[583,1334,1336],{"id":1335},"how-they-work-together","How They Work Together",[531,1338,1339],{},"The two tiers complement each other:",[1341,1342,1343,1349,1359,1365],"ol",{},[546,1344,1345,1348],{},[591,1346,1347],{},"Request completes"," - evlog knows the status, duration, and path",[546,1350,1351,1354,1355,1358],{},[591,1352,1353],{},"Tail sampling evaluates"," - if any ",[610,1356,1357],{},"keep"," condition matches, the log is force-kept",[546,1360,1361,1364],{},[591,1362,1363],{},"Head sampling applies"," - only if tail sampling didn't force-keep, the random percentage check runs",[546,1366,1367,1370],{},[591,1368,1369],{},"Log emits or drops"," - kept logs go through enrichment and draining as normal",[531,1372,1373,1374,1377,1378,1380],{},"This means a request to ",[610,1375,1376],{},"\u002Fapi\u002Fpayments\u002Fcharge"," that returns a 500 in 2 seconds will always be logged, even if ",[610,1379,1089],{}," is set to 1%. The tail conditions rescue it.",[1382,1383],"tail-sample-decision",{},[599,1385,1386,1462],{},[602,1387,1389],{"className":604,"code":1388,"filename":500,"language":607,"meta":608,"style":608},"sampling: {\n  rates: { info: 10 },\n  keep: [\n    { status: 400 },\n    { duration: 1000 },\n  ],\n}\n",[610,1390,1391,1400,1417,1426,1439,1451,1458],{"__ignoreMap":608},[556,1392,1393,1396,1398],{"class":614,"line":615},[556,1394,1395],{"class":1120},"sampling",[556,1397,644],{"class":633},[556,1399,673],{"class":633},[556,1401,1402,1405,1407,1409,1411,1413,1415],{"class":614,"line":637},[556,1403,1404],{"class":1120},"  rates",[556,1406,644],{"class":633},[556,1408,801],{"class":633},[556,1410,1143],{"class":1120},[556,1412,644],{"class":633},[556,1414,705],{"class":704},[556,1416,1008],{"class":633},[556,1418,1419,1422,1424],{"class":614,"line":665},[556,1420,1421],{"class":1120},"  keep",[556,1423,644],{"class":633},[556,1425,1159],{"class":640},[556,1427,1428,1431,1433,1435,1437],{"class":614,"line":676},[556,1429,1430],{"class":633},"    {",[556,1432,1167],{"class":640},[556,1434,644],{"class":633},[556,1436,1172],{"class":704},[556,1438,1008],{"class":633},[556,1440,1441,1443,1445,1447,1449],{"class":614,"line":686},[556,1442,1430],{"class":633},[556,1444,1185],{"class":640},[556,1446,644],{"class":633},[556,1448,1190],{"class":704},[556,1450,1008],{"class":633},[556,1452,1453,1456],{"class":614,"line":696},[556,1454,1455],{"class":640},"  ]",[556,1457,662],{"class":633},[556,1459,1460],{"class":614,"line":715},[556,1461,1232],{"class":633},[602,1463,1468],{"className":1464,"code":1465,"filename":1466,"language":1467,"meta":608,"style":608},"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",[610,1469,1470,1500,1532,1564],{"__ignoreMap":608},[556,1471,1472,1475,1478,1481,1484,1487,1490,1493,1496,1498],{"class":614,"line":615},[556,1473,1474],{"class":1120},"POST",[556,1476,1477],{"class":653}," \u002Fapi\u002Fusers",[556,1479,1480],{"class":704},"     200",[556,1482,1483],{"class":653},"  45ms",[556,1485,1486],{"class":653},"   →",[556,1488,1489],{"class":653}," 10%",[556,1491,1492],{"class":653}," chance",[556,1494,1495],{"class":629}," (head ",[556,1497,1395],{"class":653},[556,1499,787],{"class":629},[556,1501,1502,1504,1506,1509,1511,1513,1516,1519,1522,1525,1528,1530],{"class":614,"line":637},[556,1503,1474],{"class":1120},[556,1505,1477],{"class":653},[556,1507,1508],{"class":704},"     500",[556,1510,1483],{"class":653},[556,1512,1486],{"class":653},[556,1514,1515],{"class":653}," always",[556,1517,1518],{"class":653}," kept",[556,1520,1521],{"class":629}," (status ",[556,1523,1524],{"class":633},">",[556,1526,1527],{"class":653},"=",[556,1529,1172],{"class":704},[556,1531,787],{"class":629},[556,1533,1534,1537,1540,1543,1546,1549,1551,1553,1556,1558,1560,1562],{"class":614,"line":665},[556,1535,1536],{"class":1120},"GET",[556,1538,1539],{"class":653},"  \u002Fapi\u002Fproducts",[556,1541,1542],{"class":704},"  200",[556,1544,1545],{"class":653},"  2300ms",[556,1547,1548],{"class":653}," →",[556,1550,1515],{"class":653},[556,1552,1518],{"class":653},[556,1554,1555],{"class":629}," (duration ",[556,1557,1524],{"class":633},[556,1559,1527],{"class":653},[556,1561,1190],{"class":704},[556,1563,787],{"class":629},[556,1565,1566,1568,1571,1573,1576,1579,1581,1583,1585,1587],{"class":614,"line":676},[556,1567,1474],{"class":1120},[556,1569,1570],{"class":653}," \u002Fapi\u002Fcheckout",[556,1572,1542],{"class":704},[556,1574,1575],{"class":653},"  120ms",[556,1577,1578],{"class":653},"  →",[556,1580,1489],{"class":653},[556,1582,1492],{"class":653},[556,1584,1495],{"class":629},[556,1586,1395],{"class":653},[556,1588,787],{"class":629},[583,1590,1592],{"id":1591},"custom-tail-sampling","Custom Tail Sampling",[531,1594,1595,1596,1599,1600,1602],{},"For conditions beyond status, duration, and path, use the ",[610,1597,1598],{},"evlog:emit:keep"," hook in Nuxt\u002FNitro or the ",[610,1601,1357],{}," callback in other frameworks.",[599,1604,1605,1747,1934],{},[602,1606,1609],{"className":604,"code":1607,"filename":1608,"language":607,"meta":608,"style":608},"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)",[610,1610,1611,1635,1673,1713,1729,1734,1741],{"__ignoreMap":608},[556,1612,1613,1615,1617,1620,1622,1624,1628,1630,1633],{"class":614,"line":615},[556,1614,619],{"class":618},[556,1616,622],{"class":618},[556,1618,1619],{"class":625}," defineNitroPlugin",[556,1621,630],{"class":629},[556,1623,630],{"class":633},[556,1625,1627],{"class":1626},"sHdIc","nitroApp",[556,1629,1332],{"class":633},[556,1631,1632],{"class":832}," =>",[556,1634,673],{"class":633},[556,1636,1637,1640,1643,1646,1648,1651,1653,1655,1657,1659,1661,1664,1667,1669,1671],{"class":614,"line":637},[556,1638,1639],{"class":629},"  nitroApp",[556,1641,1642],{"class":633},".",[556,1644,1645],{"class":629},"hooks",[556,1647,1642],{"class":633},[556,1649,1650],{"class":625},"hook",[556,1652,630],{"class":640},[556,1654,650],{"class":633},[556,1656,1598],{"class":653},[556,1658,650],{"class":633},[556,1660,708],{"class":633},[556,1662,1663],{"class":633}," (",[556,1665,1666],{"class":1626},"ctx",[556,1668,1332],{"class":633},[556,1670,1632],{"class":832},[556,1672,673],{"class":633},[556,1674,1675,1678,1680,1682,1684,1687,1689,1692,1695,1698,1701,1703,1706,1708,1711],{"class":614,"line":665},[556,1676,1677],{"class":618},"    if",[556,1679,1663],{"class":640},[556,1681,1666],{"class":629},[556,1683,1642],{"class":633},[556,1685,1686],{"class":629},"context",[556,1688,1642],{"class":633},[556,1690,1691],{"class":629},"user",[556,1693,1694],{"class":633},"?.",[556,1696,1697],{"class":629},"plan",[556,1699,1700],{"class":633}," ===",[556,1702,813],{"class":633},[556,1704,1705],{"class":653},"enterprise",[556,1707,650],{"class":633},[556,1709,1710],{"class":640},") ",[556,1712,634],{"class":633},[556,1714,1715,1718,1720,1723,1725],{"class":614,"line":676},[556,1716,1717],{"class":629},"      ctx",[556,1719,1642],{"class":633},[556,1721,1722],{"class":629},"shouldKeep",[556,1724,848],{"class":633},[556,1726,1728],{"class":1727},"sfNiH"," true\n",[556,1730,1731],{"class":614,"line":686},[556,1732,1733],{"class":633},"    }\n",[556,1735,1736,1739],{"class":614,"line":696},[556,1737,1738],{"class":633},"  }",[556,1740,787],{"class":640},[556,1742,1743,1745],{"class":614,"line":715},[556,1744,784],{"class":633},[556,1746,787],{"class":629},[602,1748,1750],{"className":604,"code":1749,"filename":791,"language":607,"meta":608,"style":608},"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",[610,1751,1752,1770,1774,1798,1812,1820,1836,1859,1863,1875,1907,1919,1923,1927],{"__ignoreMap":608},[556,1753,1754,1756,1758,1760,1762,1764,1766,1768],{"class":614,"line":615},[556,1755,798],{"class":618},[556,1757,801],{"class":633},[556,1759,804],{"class":629},[556,1761,807],{"class":633},[556,1763,810],{"class":618},[556,1765,813],{"class":633},[556,1767,816],{"class":653},[556,1769,819],{"class":633},[556,1771,1772],{"class":614,"line":637},[556,1773,825],{"emptyLinePlaceholder":824},[556,1775,1776,1778,1780,1782,1784,1786,1788,1790,1792,1794,1796],{"class":614,"line":665},[556,1777,619],{"class":618},[556,1779,833],{"class":832},[556,1781,801],{"class":633},[556,1783,838],{"class":629},[556,1785,708],{"class":633},[556,1787,843],{"class":629},[556,1789,784],{"class":633},[556,1791,848],{"class":633},[556,1793,804],{"class":625},[556,1795,630],{"class":629},[556,1797,634],{"class":633},[556,1799,1800,1802,1804,1806,1808,1810],{"class":614,"line":676},[556,1801,859],{"class":640},[556,1803,644],{"class":633},[556,1805,813],{"class":633},[556,1807,866],{"class":653},[556,1809,650],{"class":633},[556,1811,662],{"class":633},[556,1813,1814,1816,1818],{"class":614,"line":686},[556,1815,875],{"class":640},[556,1817,644],{"class":633},[556,1819,673],{"class":633},[556,1821,1822,1824,1826,1828,1830,1832,1834],{"class":614,"line":696},[556,1823,884],{"class":640},[556,1825,644],{"class":633},[556,1827,801],{"class":633},[556,1829,1143],{"class":640},[556,1831,644],{"class":633},[556,1833,705],{"class":704},[556,1835,1008],{"class":633},[556,1837,1838,1840,1842,1844,1847,1849,1851,1853,1855,1857],{"class":614,"line":715},[556,1839,1154],{"class":640},[556,1841,644],{"class":633},[556,1843,647],{"class":629},[556,1845,1846],{"class":633},"{",[556,1848,1167],{"class":640},[556,1850,644],{"class":633},[556,1852,1172],{"class":704},[556,1854,807],{"class":633},[556,1856,659],{"class":629},[556,1858,662],{"class":633},[556,1860,1861],{"class":614,"line":731},[556,1862,778],{"class":633},[556,1864,1865,1867,1869,1871,1873],{"class":614,"line":747},[556,1866,1421],{"class":640},[556,1868,630],{"class":633},[556,1870,1666],{"class":1626},[556,1872,1332],{"class":633},[556,1874,673],{"class":633},[556,1876,1877,1879,1881,1883,1885,1887,1889,1891,1893,1895,1897,1899,1901,1903,1905],{"class":614,"line":763},[556,1878,1677],{"class":618},[556,1880,1663],{"class":640},[556,1882,1666],{"class":629},[556,1884,1642],{"class":633},[556,1886,1686],{"class":629},[556,1888,1642],{"class":633},[556,1890,1691],{"class":629},[556,1892,1694],{"class":633},[556,1894,1697],{"class":629},[556,1896,1700],{"class":633},[556,1898,813],{"class":633},[556,1900,1705],{"class":653},[556,1902,650],{"class":633},[556,1904,1710],{"class":640},[556,1906,634],{"class":633},[556,1908,1909,1911,1913,1915,1917],{"class":614,"line":769},[556,1910,1717],{"class":629},[556,1912,1642],{"class":633},[556,1914,1722],{"class":629},[556,1916,848],{"class":633},[556,1918,1728],{"class":1727},[556,1920,1921],{"class":614,"line":775},[556,1922,1733],{"class":633},[556,1924,1925],{"class":614,"line":781},[556,1926,778],{"class":633},[556,1928,1930,1932],{"class":614,"line":1929},14,[556,1931,784],{"class":633},[556,1933,787],{"class":629},[602,1935,1938],{"className":604,"code":1936,"filename":1937,"language":607,"meta":608,"style":608},"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)",[610,1939,1940,1960,1964,1982,1994,2026,2038,2042,2046],{"__ignoreMap":608},[556,1941,1942,1944,1946,1949,1951,1953,1955,1958],{"class":614,"line":615},[556,1943,798],{"class":618},[556,1945,801],{"class":633},[556,1947,1948],{"class":629}," evlog",[556,1950,807],{"class":633},[556,1952,810],{"class":618},[556,1954,813],{"class":633},[556,1956,1957],{"class":653},"evlog\u002Fhono",[556,1959,819],{"class":633},[556,1961,1962],{"class":614,"line":637},[556,1963,825],{"emptyLinePlaceholder":824},[556,1965,1966,1969,1971,1974,1976,1978,1980],{"class":614,"line":665},[556,1967,1968],{"class":629},"app",[556,1970,1642],{"class":633},[556,1972,1973],{"class":625},"use",[556,1975,630],{"class":629},[556,1977,970],{"class":625},[556,1979,630],{"class":629},[556,1981,634],{"class":633},[556,1983,1984,1986,1988,1990,1992],{"class":614,"line":676},[556,1985,1421],{"class":640},[556,1987,630],{"class":633},[556,1989,1666],{"class":1626},[556,1991,1332],{"class":633},[556,1993,673],{"class":633},[556,1995,1996,1998,2000,2002,2004,2006,2008,2010,2012,2014,2016,2018,2020,2022,2024],{"class":614,"line":686},[556,1997,1677],{"class":618},[556,1999,1663],{"class":640},[556,2001,1666],{"class":629},[556,2003,1642],{"class":633},[556,2005,1686],{"class":629},[556,2007,1642],{"class":633},[556,2009,1691],{"class":629},[556,2011,1694],{"class":633},[556,2013,1697],{"class":629},[556,2015,1700],{"class":633},[556,2017,813],{"class":633},[556,2019,1705],{"class":653},[556,2021,650],{"class":633},[556,2023,1710],{"class":640},[556,2025,634],{"class":633},[556,2027,2028,2030,2032,2034,2036],{"class":614,"line":696},[556,2029,1717],{"class":629},[556,2031,1642],{"class":633},[556,2033,1722],{"class":629},[556,2035,848],{"class":633},[556,2037,1728],{"class":1727},[556,2039,2040],{"class":614,"line":715},[556,2041,1733],{"class":633},[556,2043,2044],{"class":614,"line":731},[556,2045,778],{"class":633},[556,2047,2048,2050],{"class":614,"line":747},[556,2049,784],{"class":633},[556,2051,2052],{"class":629},"))\n",[531,2054,2055,2056,2058],{},"The ",[610,2057,1666],{}," object contains:",[1262,2060,2061,2072],{},[1265,2062,2063],{},[1268,2064,2065,2068,2070],{},[1271,2066,2067],{},"Field",[1271,2069,1276],{},[1271,2071,1279],{},[1281,2073,2074,2088,2101,2115,2129,2146],{},[1268,2075,2076,2080,2085],{},[1286,2077,2078],{},[610,2079,1242],{},[1286,2081,2082],{},[610,2083,2084],{},"number | undefined",[1286,2086,2087],{},"HTTP response status",[1268,2089,2090,2094,2098],{},[1286,2091,2092],{},[610,2093,1246],{},[1286,2095,2096],{},[610,2097,2084],{},[1286,2099,2100],{},"Request duration in ms",[1268,2102,2103,2107,2112],{},[1286,2104,2105],{},[610,2106,1250],{},[1286,2108,2109],{},[610,2110,2111],{},"string | undefined",[1286,2113,2114],{},"Request path",[1268,2116,2117,2122,2126],{},[1286,2118,2119],{},[610,2120,2121],{},"method",[1286,2123,2124],{},[610,2125,2111],{},[1286,2127,2128],{},"HTTP method",[1268,2130,2131,2135,2140],{},[1286,2132,2133],{},[610,2134,1686],{},[1286,2136,2137],{},[610,2138,2139],{},"Record\u003Cstring, unknown>",[1286,2141,2142,2143],{},"All fields set via ",[610,2144,2145],{},"log.set()",[1268,2147,2148,2152,2157],{},[1286,2149,2150],{},[610,2151,1722],{},[1286,2153,2154],{},[610,2155,2156],{},"boolean",[1286,2158,2159,2160,2163],{},"Set to ",[610,2161,2162],{},"true"," to force-keep",[583,2165,2167],{"id":2166},"production-example","Production Example",[531,2169,2170],{},"A typical production configuration that balances cost and visibility:",[599,2172,2173,2428,2633],{},[602,2174,2176],{"className":604,"code":2175,"filename":606,"language":607,"meta":608,"style":608},"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",[610,2177,2178,2190,2208,2216,2237,2241,2250,2259,2268,2277,2288,2299,2310,2321,2326,2336,2350,2363,2380,2398,2406,2411,2416,2421],{"__ignoreMap":608},[556,2179,2180,2182,2184,2186,2188],{"class":614,"line":615},[556,2181,619],{"class":618},[556,2183,622],{"class":618},[556,2185,626],{"class":625},[556,2187,630],{"class":629},[556,2189,634],{"class":633},[556,2191,2192,2194,2196,2198,2200,2202,2204,2206],{"class":614,"line":637},[556,2193,641],{"class":640},[556,2195,644],{"class":633},[556,2197,647],{"class":629},[556,2199,650],{"class":633},[556,2201,654],{"class":653},[556,2203,650],{"class":633},[556,2205,659],{"class":629},[556,2207,662],{"class":633},[556,2209,2210,2212,2214],{"class":614,"line":665},[556,2211,668],{"class":640},[556,2213,644],{"class":633},[556,2215,673],{"class":633},[556,2217,2218,2221,2223,2225,2227,2229,2231,2233,2235],{"class":614,"line":676},[556,2219,2220],{"class":640},"    env",[556,2222,644],{"class":633},[556,2224,801],{"class":633},[556,2226,997],{"class":640},[556,2228,644],{"class":633},[556,2230,813],{"class":633},[556,2232,866],{"class":653},[556,2234,650],{"class":633},[556,2236,1008],{"class":633},[556,2238,2239],{"class":614,"line":686},[556,2240,778],{"class":633},[556,2242,2243,2246,2248],{"class":614,"line":696},[556,2244,2245],{"class":640},"  $production",[556,2247,644],{"class":633},[556,2249,673],{"class":633},[556,2251,2252,2255,2257],{"class":614,"line":715},[556,2253,2254],{"class":640},"    evlog",[556,2256,644],{"class":633},[556,2258,673],{"class":633},[556,2260,2261,2264,2266],{"class":614,"line":731},[556,2262,2263],{"class":640},"      sampling",[556,2265,644],{"class":633},[556,2267,673],{"class":633},[556,2269,2270,2273,2275],{"class":614,"line":747},[556,2271,2272],{"class":640},"        rates",[556,2274,644],{"class":633},[556,2276,673],{"class":633},[556,2278,2279,2282,2284,2286],{"class":614,"line":763},[556,2280,2281],{"class":640},"          info",[556,2283,644],{"class":633},[556,2285,705],{"class":704},[556,2287,662],{"class":633},[556,2289,2290,2293,2295,2297],{"class":614,"line":769},[556,2291,2292],{"class":640},"          warn",[556,2294,644],{"class":633},[556,2296,723],{"class":704},[556,2298,662],{"class":633},[556,2300,2301,2304,2306,2308],{"class":614,"line":775},[556,2302,2303],{"class":640},"          debug",[556,2305,644],{"class":633},[556,2307,739],{"class":704},[556,2309,662],{"class":633},[556,2311,2312,2315,2317,2319],{"class":614,"line":781},[556,2313,2314],{"class":640},"          error",[556,2316,644],{"class":633},[556,2318,755],{"class":704},[556,2320,662],{"class":633},[556,2322,2323],{"class":614,"line":1929},[556,2324,2325],{"class":633},"        },\n",[556,2327,2329,2332,2334],{"class":614,"line":2328},15,[556,2330,2331],{"class":640},"        keep",[556,2333,644],{"class":633},[556,2335,1159],{"class":629},[556,2337,2339,2342,2344,2346,2348],{"class":614,"line":2338},16,[556,2340,2341],{"class":633},"          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{ 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 ",[610,2834,2835],{},"$production"," override to keep full logging in development while sampling in production. In other frameworks, use your own environment check or config system.",[583,2838,2840],{"id":2839},"next-steps","Next Steps",[543,2842,2843,2848],{},[546,2844,2845,2847],{},[572,2846,513],{"href":514}," - Security and production checklist",[546,2849,2850,2852],{},[572,2851,46],{"href":47}," - Design effective wide events",[2854,2855,2856],"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 .s2Zo4, html code.shiki .s2Zo4{--shiki-light:#6182B8;--shiki-default:#82AAFF;--shiki-dark:#82AAFF}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 .swJcz, html code.shiki .swJcz{--shiki-light:#E53935;--shiki-default:#F07178;--shiki-dark:#F07178}html pre.shiki code .sfazB, html code.shiki .sfazB{--shiki-light:#91B859;--shiki-default:#C3E88D;--shiki-dark:#C3E88D}html pre.shiki code .sbssI, html code.shiki .sbssI{--shiki-light:#F76D47;--shiki-default:#F78C6C;--shiki-dark:#F78C6C}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 .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 .spNyl, html code.shiki .spNyl{--shiki-light:#9C3EDA;--shiki-default:#C792EA;--shiki-dark:#C792EA}html pre.shiki code .sBMFI, html code.shiki .sBMFI{--shiki-light:#E2931D;--shiki-default:#FFCB6B;--shiki-dark:#FFCB6B}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 .sfNiH, html code.shiki .sfNiH{--shiki-light:#FF5370;--shiki-default:#FF9CAC;--shiki-dark:#FF9CAC}",{"title":608,"searchDepth":637,"depth":637,"links":2858},[2859,2860,2863,2864,2865,2866],{"id":585,"depth":637,"text":586},{"id":1097,"depth":637,"text":1098,"children":2861},[2862],{"id":1259,"depth":665,"text":1260},{"id":1335,"depth":637,"text":1336},{"id":1591,"depth":637,"text":1592},{"id":2166,"depth":637,"text":2167},{"id":2839,"depth":637,"text":2840},"Control log volume with two-tier sampling. 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