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OpenTelemetry","\u002Fcompare\u002Fopentelemetry","8.compare\u002F2.opentelemetry",{"title":601,"path":602,"stem":603,"icon":577},"evlog vs LogTape","\u002Fcompare\u002Flogtape","8.compare\u002F3.logtape",{"title":605,"path":606,"stem":607,"icon":577},"evlog vs Winston: formats and request events","\u002Fcompare\u002Fwinston","8.compare\u002F4.winston",{"title":609,"path":610,"stem":611,"icon":577},"evlog vs Consola: reporters and request context","\u002Fcompare\u002Fconsola","8.compare\u002F5.consola",{"id":613,"title":614,"body":615,"description":1268,"extension":1269,"links":1270,"meta":1275,"navigation":1276,"path":145,"seo":1277,"stem":146,"__hash__":1278},"docs\u002F3.cli\u002F9.observability-score.md","Observability Score with evlog map",{"type":616,"value":617,"toc":1261},"minimark",[618,627,632,635,646,657,686,689,693,700,711,718,729,733,736,942,945,963,972,1181,1187,1194,1198,1214,1220,1224,1227,1247,1257],[619,620,621,622,626],"p",{},"Before changing your logging, inspect which supported entry points meet evlog's logging checks. ",[623,624,625],"code",{},"evlog map"," reads source files and reports missing context, structured errors, and other recognized patterns. Its score summarizes those static checks, not the percentage of your application that can explain a production failure.",[628,629,631],"h2",{"id":630},"check-the-supported-scope-first","Check the supported scope first",[619,633,634],{},"The CLI currently has adapters for Nuxt, Nitro, Next.js, TanStack Start, Hono, Express, and Fastify. Run it from the application package, not a monorepo root without a detected framework. An unsupported Node.js project cannot be scored by these adapters.",[619,636,637,638,641,642,645],{},"You can scan a supported project without installing evlog in it. However, checks such as ",[623,639,640],{},"wide-event"," and ",[623,643,644],{},"context"," recognize evlog conventions. Existing Pino or LogTape instrumentation can receive a low score even when it produces useful logs. Use the report to plan evlog adoption, not to rank logging libraries.",[619,647,648,649,652,653,656],{},"This command inspects the project without writing ",[623,650,651],{},"evlog.map.json",". The examples on this page were checked with CLI 0.6.3 (",[623,654,655],{},"evlog --version","):",[658,659,665],"pre",{"className":660,"code":661,"filename":662,"language":663,"meta":664,"style":664},"language-bash shiki shiki-themes material-theme-lighter material-theme material-theme-palenight","npx evlog map --no-write\n","Terminal","bash","",[623,666,667],{"__ignoreMap":664},[668,669,672,676,680,683],"span",{"class":670,"line":671},"line",1,[668,673,675],{"class":674},"sBMFI","npx",[668,677,679],{"class":678},"sfazB"," evlog",[668,681,682],{"class":678}," map",[668,684,685],{"class":678}," --no-write\n",[619,687,688],{},"The scan does not execute handlers or require traffic. It only sees entry points and code patterns its adapter recognizes. Check the detected framework and entry-point count before interpreting the number.",[628,690,692],{"id":691},"read-a-real-report","Read a real report",[619,694,695,696,699],{},"This output comes from the repository's Next.js example at commit ",[623,697,698],{},"e154fa9c",". It has five detected entry points, two with failed requirements:",[701,702,703],"code-collapse",{},[658,704,709],{"className":705,"code":707,"filename":625,"language":708,"meta":664},[706],"language-text","█▀█ ▀▀█   score \u002F100              evlog-nextjs-example · Next.js\n█▀█   █   ▰▰▰▰▰▰▰▰▰▰▰▰▰▰▰▰▰▱▱▱    5 entry points scanned\n▀▀▀   ▀   good                    ▆▆█▁█\n\nCOVERAGE\n● API handlers       ▰▰▰▰▰▰▰▰▰▱   92  1 of 3 have gaps\n● Pages              ▰▰▰▰▰▰▰▰▱▱   80  1 swallows fetch errors\n● Money & auth       ▰▰▰▰▰▰▰▰▱▱   75  missing audit trails\n\nFIX FIRST\n1. POST   \u002Fapi\u002Fcheckout $ — moves money with no audit trail\n   app\u002Fapi\u002Fcheckout\u002Froute.ts:3 · evlog.dev\u002Fuse-cases\u002Faudit\u002Foverview\n2. PAGE   \u002F — swallows fetch errors — users see a blank page\n   app\u002Fpage.tsx:1 · evlog.dev\u002Flearn\u002Flifecycle\n\n✓ Already solid: \u002Fapi\u002Ferror · \u002Fapi\u002Fhealth\n▲ 87 → 100 by fixing the 2 above\n\n────────────────────────────\nhow this score works → evlog.dev\u002Fcli\u002Fscoring\n▸ evlog map --all every entry point · evlog map \u003Cfile> inspect one\n  --min-score 80 CI gate\n","text",[623,710,707],{"__ignoreMap":664},[619,712,713,714,717],{},"The 87\u002F100 score is a weighted average of checks on those entries. It does not mean 87% of the application's execution paths are covered. ",[623,715,716],{},"FIX FIRST"," highlights requirements to inspect, and the projected 100 means those static requirements would pass. It does not prove delivery to a backend or usefulness during an incident.",[619,719,720,721,725,726,728],{},"The ",[722,723,724],"a",{"href":120},"Scoring reference"," owns the weights, aggregation formula, grades, and sensitivity classification. ",[722,727,114],{"href":115}," explains what each check recognizes.",[628,730,732],{"id":731},"fix-one-context-gap","Fix one context gap",[619,734,735],{},"In a Next.js App Router application with evlog installed, this handler is wrapped for logging but adds no application context:",[658,737,742],{"className":738,"code":739,"filename":740,"language":741,"meta":664,"style":664},"language-typescript shiki shiki-themes material-theme-lighter material-theme material-theme-palenight","import { withEvlog } from '@\u002Flib\u002Fevlog'\n\nexport const GET = withEvlog(async (request: Request) => {\n  const name = new URL(request.url).searchParams.get('name') ?? 'world'\n  return Response.json({ message: `Hello ${name}` })\n})\n","app\u002Fapi\u002Fhello\u002Froute.ts, before","typescript",[623,743,744,773,780,827,891,934],{"__ignoreMap":664},[668,745,746,750,754,758,761,764,767,770],{"class":670,"line":671},[668,747,749],{"class":748},"s7zQu","import",[668,751,753],{"class":752},"sMK4o"," {",[668,755,757],{"class":756},"sTEyZ"," withEvlog",[668,759,760],{"class":752}," }",[668,762,763],{"class":748}," from",[668,765,766],{"class":752}," '",[668,768,769],{"class":678},"@\u002Flib\u002Fevlog",[668,771,772],{"class":752},"'\n",[668,774,776],{"class":670,"line":775},2,[668,777,779],{"emptyLinePlaceholder":778},true,"\n",[668,781,783,786,790,793,796,799,802,805,808,812,815,818,821,824],{"class":670,"line":782},3,[668,784,785],{"class":748},"export",[668,787,789],{"class":788},"spNyl"," const",[668,791,792],{"class":756}," GET ",[668,794,795],{"class":752},"=",[668,797,757],{"class":798},"s2Zo4",[668,800,801],{"class":756},"(",[668,803,804],{"class":788},"async",[668,806,807],{"class":752}," (",[668,809,811],{"class":810},"sHdIc","request",[668,813,814],{"class":752},":",[668,816,817],{"class":674}," Request",[668,819,820],{"class":752},")",[668,822,823],{"class":788}," =>",[668,825,826],{"class":752}," {\n",[668,828,830,833,836,839,842,845,848,850,853,856,858,860,863,865,868,870,873,876,878,881,884,886,889],{"class":670,"line":829},4,[668,831,832],{"class":788},"  const",[668,834,835],{"class":756}," name",[668,837,838],{"class":752}," =",[668,840,841],{"class":752}," new",[668,843,844],{"class":798}," URL",[668,846,801],{"class":847},"swJcz",[668,849,811],{"class":756},[668,851,852],{"class":752},".",[668,854,855],{"class":756},"url",[668,857,820],{"class":847},[668,859,852],{"class":752},[668,861,862],{"class":756},"searchParams",[668,864,852],{"class":752},[668,866,867],{"class":798},"get",[668,869,801],{"class":847},[668,871,872],{"class":752},"'",[668,874,875],{"class":678},"name",[668,877,872],{"class":752},[668,879,880],{"class":847},") ",[668,882,883],{"class":752},"??",[668,885,766],{"class":752},[668,887,888],{"class":678},"world",[668,890,772],{"class":752},[668,892,894,897,900,902,905,907,910,913,915,918,921,924,926,929,931],{"class":670,"line":893},5,[668,895,896],{"class":748},"  return",[668,898,899],{"class":756}," Response",[668,901,852],{"class":752},[668,903,904],{"class":798},"json",[668,906,801],{"class":847},[668,908,909],{"class":752},"{",[668,911,912],{"class":847}," message",[668,914,814],{"class":752},[668,916,917],{"class":752}," `",[668,919,920],{"class":678},"Hello ",[668,922,923],{"class":752},"${",[668,925,875],{"class":756},[668,927,928],{"class":752},"}`",[668,930,760],{"class":752},[668,932,933],{"class":847},")\n",[668,935,937,940],{"class":670,"line":936},6,[668,938,939],{"class":752},"}",[668,941,933],{"class":756},[619,943,944],{},"Inspect that file directly:",[658,946,948],{"className":660,"code":947,"filename":662,"language":663,"meta":664,"style":664},"npx evlog map app\u002Fapi\u002Fhello\u002Froute.ts --no-write\n",[623,949,950],{"__ignoreMap":664},[668,951,952,954,956,958,961],{"class":670,"line":671},[668,953,675],{"class":674},[668,955,679],{"class":678},[668,957,682],{"class":678},[668,959,960],{"class":678}," app\u002Fapi\u002Fhello\u002Froute.ts",[668,962,685],{"class":678},[619,964,720,965,967,968,971],{},[623,966,644],{}," requirement fails because the handler has no recognized ",[623,969,970],{},"set()"," call. Attach a useful decision without recording the user's name:",[658,973,976],{"className":738,"code":974,"filename":975,"language":741,"meta":664,"style":664},"import { useLogger, withEvlog } from '@\u002Flib\u002Fevlog'\n\nexport const GET = withEvlog(async (request: Request) => {\n  const log = useLogger()\n  const name = new URL(request.url).searchParams.get('name') ?? 'world'\n  log.set({ greeting: { personalized: name !== 'world' } })\n  return Response.json({ message: `Hello ${name}` })\n})\n","app\u002Fapi\u002Fhello\u002Froute.ts, after",[623,977,978,1002,1006,1036,1050,1098,1141,1174],{"__ignoreMap":664},[668,979,980,982,984,987,990,992,994,996,998,1000],{"class":670,"line":671},[668,981,749],{"class":748},[668,983,753],{"class":752},[668,985,986],{"class":756}," useLogger",[668,988,989],{"class":752},",",[668,991,757],{"class":756},[668,993,760],{"class":752},[668,995,763],{"class":748},[668,997,766],{"class":752},[668,999,769],{"class":678},[668,1001,772],{"class":752},[668,1003,1004],{"class":670,"line":775},[668,1005,779],{"emptyLinePlaceholder":778},[668,1007,1008,1010,1012,1014,1016,1018,1020,1022,1024,1026,1028,1030,1032,1034],{"class":670,"line":782},[668,1009,785],{"class":748},[668,1011,789],{"class":788},[668,1013,792],{"class":756},[668,1015,795],{"class":752},[668,1017,757],{"class":798},[668,1019,801],{"class":756},[668,1021,804],{"class":788},[668,1023,807],{"class":752},[668,1025,811],{"class":810},[668,1027,814],{"class":752},[668,1029,817],{"class":674},[668,1031,820],{"class":752},[668,1033,823],{"class":788},[668,1035,826],{"class":752},[668,1037,1038,1040,1043,1045,1047],{"class":670,"line":829},[668,1039,832],{"class":788},[668,1041,1042],{"class":756}," log",[668,1044,838],{"class":752},[668,1046,986],{"class":798},[668,1048,1049],{"class":847},"()\n",[668,1051,1052,1054,1056,1058,1060,1062,1064,1066,1068,1070,1072,1074,1076,1078,1080,1082,1084,1086,1088,1090,1092,1094,1096],{"class":670,"line":893},[668,1053,832],{"class":788},[668,1055,835],{"class":756},[668,1057,838],{"class":752},[668,1059,841],{"class":752},[668,1061,844],{"class":798},[668,1063,801],{"class":847},[668,1065,811],{"class":756},[668,1067,852],{"class":752},[668,1069,855],{"class":756},[668,1071,820],{"class":847},[668,1073,852],{"class":752},[668,1075,862],{"class":756},[668,1077,852],{"class":752},[668,1079,867],{"class":798},[668,1081,801],{"class":847},[668,1083,872],{"class":752},[668,1085,875],{"class":678},[668,1087,872],{"class":752},[668,1089,880],{"class":847},[668,1091,883],{"class":752},[668,1093,766],{"class":752},[668,1095,888],{"class":678},[668,1097,772],{"class":752},[668,1099,1100,1103,1105,1108,1110,1112,1115,1117,1119,1122,1124,1126,1129,1131,1133,1135,1137,1139],{"class":670,"line":936},[668,1101,1102],{"class":756},"  log",[668,1104,852],{"class":752},[668,1106,1107],{"class":798},"set",[668,1109,801],{"class":847},[668,1111,909],{"class":752},[668,1113,1114],{"class":847}," greeting",[668,1116,814],{"class":752},[668,1118,753],{"class":752},[668,1120,1121],{"class":847}," personalized",[668,1123,814],{"class":752},[668,1125,835],{"class":756},[668,1127,1128],{"class":752}," !==",[668,1130,766],{"class":752},[668,1132,888],{"class":678},[668,1134,872],{"class":752},[668,1136,760],{"class":752},[668,1138,760],{"class":752},[668,1140,933],{"class":847},[668,1142,1144,1146,1148,1150,1152,1154,1156,1158,1160,1162,1164,1166,1168,1170,1172],{"class":670,"line":1143},7,[668,1145,896],{"class":748},[668,1147,899],{"class":756},[668,1149,852],{"class":752},[668,1151,904],{"class":798},[668,1153,801],{"class":847},[668,1155,909],{"class":752},[668,1157,912],{"class":847},[668,1159,814],{"class":752},[668,1161,917],{"class":752},[668,1163,920],{"class":678},[668,1165,923],{"class":752},[668,1167,875],{"class":756},[668,1169,928],{"class":752},[668,1171,760],{"class":752},[668,1173,933],{"class":847},[668,1175,1177,1179],{"class":670,"line":1176},8,[668,1178,939],{"class":752},[668,1180,933],{"class":756},[619,1182,1183,1184,1186],{},"Run the same command again. The ",[623,1185,644],{}," requirement now passes, removing its 15-point penalty. In this isolated example the route moves from 85 to 100. In a larger application the global change depends on all scored entries and their weights.",[619,1188,1189,1190,1193],{},"A passing check establishes that the pattern exists. It does not judge whether ",[623,1191,1192],{},"greeting.personalized"," is the field your incident investigation needs. Review the event output and required business fields separately.",[628,1195,1197],{"id":1196},"know-what-a-high-score-leaves-untested","Know what a high score leaves untested",[1199,1200,1201,1205,1208,1211],"ul",{},[1202,1203,1204],"li",{},"Source patterns do not prove runtime execution, complete error-path coverage, or successful delivery to a backend.",[1202,1206,1207],{},"Sensitivity classification uses imports and route paths. Inspect the reported reasons for money, authentication, or personal-data flags.",[1202,1209,1210],{},"The current CLI can show 100 when no scorable entries are found. An empty scan is no evidence of instrumentation, so inspect the count and scope first.",[1202,1212,1213],{},"Logging through wrappers or abstractions the analyzer does not recognize can produce false positives. Look at the code before applying a suggestion.",[619,1215,1216,1217,852],{},"A high score is useful for checking agreed conventions alongside runtime tests and ",[722,1218,1219],{"href":67},"sampled production events",[628,1221,1223],{"id":1222},"add-a-ci-gate-after-reviewing-the-baseline","Add a CI gate after reviewing the baseline",[619,1225,1226],{},"Pin the CLI version and keep the analyzed package, configuration, and exclusions consistent. Rule changes can change a score without an application edit.",[619,1228,1229,1230,1232,1233,1236,1237,1239,1240,1242,1243,1246],{},"Commit a reviewed ",[623,1231,651],{}," baseline and use ",[623,1234,1235],{},"--baseline"," to detect recognized requirement or score regressions on existing entries. It does not track every context field: removing one ",[623,1238,970],{}," call may still leave another call that satisfies ",[623,1241,644],{},". New entries also need review. Add ",[623,1244,1245],{},"--min-score"," when you want a floor on the current aggregate score, understanding that an average can hide one weak route.",[619,1248,720,1249,1252,1253,1256],{},[722,1250,1251],{"href":125},"CI guide"," covers exit codes and gate configuration. 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