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OpenTelemetry","\u002Fcompare\u002Fopentelemetry","8.compare\u002F2.opentelemetry",{"title":591,"path":592,"stem":593,"icon":567},"evlog vs LogTape","\u002Fcompare\u002Flogtape","8.compare\u002F3.logtape",{"title":595,"path":596,"stem":597,"icon":567},"evlog vs Winston: formats and request events","\u002Fcompare\u002Fwinston","8.compare\u002F4.winston",{"title":599,"path":600,"stem":601,"icon":567},"evlog vs Consola: reporters and request context","\u002Fcompare\u002Fconsola","8.compare\u002F5.consola",{"id":603,"title":604,"body":605,"description":1258,"extension":1259,"links":1260,"meta":1265,"navigation":1266,"path":135,"seo":1267,"stem":136,"__hash__":1268},"docs\u002F3.cli\u002F9.observability-score.md","Observability Score with evlog map",{"type":606,"value":607,"toc":1251},"minimark",[608,617,622,625,636,647,676,679,683,690,701,708,719,723,726,932,935,953,962,1171,1177,1184,1188,1204,1210,1214,1217,1237,1247],[609,610,611,612,616],"p",{},"Before changing your logging, inspect which supported entry points meet evlog's logging checks. ",[613,614,615],"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.",[618,619,621],"h2",{"id":620},"check-the-supported-scope-first","Check the supported scope first",[609,623,624],{},"The CLI currently has adapters for Nuxt, Nitro, Next.js, TanStack Start, and Hono. 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.",[609,626,627,628,631,632,635],{},"You can scan a supported project without installing evlog in it. However, checks such as ",[613,629,630],{},"wide-event"," and ",[613,633,634],{},"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.",[609,637,638,639,642,643,646],{},"This command inspects the project without writing ",[613,640,641],{},"evlog.map.json",". The examples on this page were checked with CLI 0.6.3 (",[613,644,645],{},"evlog --version","):",[648,649,655],"pre",{"className":650,"code":651,"filename":652,"language":653,"meta":654,"style":654},"language-bash shiki shiki-themes material-theme-lighter material-theme material-theme-palenight","npx evlog map --no-write\n","Terminal","bash","",[613,656,657],{"__ignoreMap":654},[658,659,662,666,670,673],"span",{"class":660,"line":661},"line",1,[658,663,665],{"class":664},"sBMFI","npx",[658,667,669],{"class":668},"sfazB"," evlog",[658,671,672],{"class":668}," map",[658,674,675],{"class":668}," --no-write\n",[609,677,678],{},"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.",[618,680,682],{"id":681},"read-a-real-report","Read a real report",[609,684,685,686,689],{},"This output comes from the repository's Next.js example at commit ",[613,687,688],{},"e154fa9c",". It has five detected entry points, two with failed requirements:",[691,692,693],"code-collapse",{},[648,694,699],{"className":695,"code":697,"filename":615,"language":698,"meta":654},[696],"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",[613,700,697],{"__ignoreMap":654},[609,702,703,704,707],{},"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. ",[613,705,706],{},"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.",[609,709,710,711,715,716,718],{},"The ",[712,713,714],"a",{"href":110},"Scoring reference"," owns the weights, aggregation formula, grades, and sensitivity classification. ",[712,717,104],{"href":105}," explains what each check recognizes.",[618,720,722],{"id":721},"fix-one-context-gap","Fix one context gap",[609,724,725],{},"In a Next.js App Router application with evlog installed, this handler is wrapped for logging but adds no application context:",[648,727,732],{"className":728,"code":729,"filename":730,"language":731,"meta":654,"style":654},"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",[613,733,734,763,770,817,881,924],{"__ignoreMap":654},[658,735,736,740,744,748,751,754,757,760],{"class":660,"line":661},[658,737,739],{"class":738},"s7zQu","import",[658,741,743],{"class":742},"sMK4o"," {",[658,745,747],{"class":746},"sTEyZ"," withEvlog",[658,749,750],{"class":742}," }",[658,752,753],{"class":738}," from",[658,755,756],{"class":742}," '",[658,758,759],{"class":668},"@\u002Flib\u002Fevlog",[658,761,762],{"class":742},"'\n",[658,764,766],{"class":660,"line":765},2,[658,767,769],{"emptyLinePlaceholder":768},true,"\n",[658,771,773,776,780,783,786,789,792,795,798,802,805,808,811,814],{"class":660,"line":772},3,[658,774,775],{"class":738},"export",[658,777,779],{"class":778},"spNyl"," const",[658,781,782],{"class":746}," GET ",[658,784,785],{"class":742},"=",[658,787,747],{"class":788},"s2Zo4",[658,790,791],{"class":746},"(",[658,793,794],{"class":778},"async",[658,796,797],{"class":742}," (",[658,799,801],{"class":800},"sHdIc","request",[658,803,804],{"class":742},":",[658,806,807],{"class":664}," Request",[658,809,810],{"class":742},")",[658,812,813],{"class":778}," =>",[658,815,816],{"class":742}," {\n",[658,818,820,823,826,829,832,835,838,840,843,846,848,850,853,855,858,860,863,866,868,871,874,876,879],{"class":660,"line":819},4,[658,821,822],{"class":778},"  const",[658,824,825],{"class":746}," name",[658,827,828],{"class":742}," =",[658,830,831],{"class":742}," new",[658,833,834],{"class":788}," URL",[658,836,791],{"class":837},"swJcz",[658,839,801],{"class":746},[658,841,842],{"class":742},".",[658,844,845],{"class":746},"url",[658,847,810],{"class":837},[658,849,842],{"class":742},[658,851,852],{"class":746},"searchParams",[658,854,842],{"class":742},[658,856,857],{"class":788},"get",[658,859,791],{"class":837},[658,861,862],{"class":742},"'",[658,864,865],{"class":668},"name",[658,867,862],{"class":742},[658,869,870],{"class":837},") ",[658,872,873],{"class":742},"??",[658,875,756],{"class":742},[658,877,878],{"class":668},"world",[658,880,762],{"class":742},[658,882,884,887,890,892,895,897,900,903,905,908,911,914,916,919,921],{"class":660,"line":883},5,[658,885,886],{"class":738},"  return",[658,888,889],{"class":746}," Response",[658,891,842],{"class":742},[658,893,894],{"class":788},"json",[658,896,791],{"class":837},[658,898,899],{"class":742},"{",[658,901,902],{"class":837}," message",[658,904,804],{"class":742},[658,906,907],{"class":742}," `",[658,909,910],{"class":668},"Hello ",[658,912,913],{"class":742},"${",[658,915,865],{"class":746},[658,917,918],{"class":742},"}`",[658,920,750],{"class":742},[658,922,923],{"class":837},")\n",[658,925,927,930],{"class":660,"line":926},6,[658,928,929],{"class":742},"}",[658,931,923],{"class":746},[609,933,934],{},"Inspect that file directly:",[648,936,938],{"className":650,"code":937,"filename":652,"language":653,"meta":654,"style":654},"npx evlog map app\u002Fapi\u002Fhello\u002Froute.ts --no-write\n",[613,939,940],{"__ignoreMap":654},[658,941,942,944,946,948,951],{"class":660,"line":661},[658,943,665],{"class":664},[658,945,669],{"class":668},[658,947,672],{"class":668},[658,949,950],{"class":668}," app\u002Fapi\u002Fhello\u002Froute.ts",[658,952,675],{"class":668},[609,954,710,955,957,958,961],{},[613,956,634],{}," requirement fails because the handler has no recognized ",[613,959,960],{},"set()"," call. Attach a useful decision without recording the user's name:",[648,963,966],{"className":728,"code":964,"filename":965,"language":731,"meta":654,"style":654},"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",[613,967,968,992,996,1026,1040,1088,1131,1164],{"__ignoreMap":654},[658,969,970,972,974,977,980,982,984,986,988,990],{"class":660,"line":661},[658,971,739],{"class":738},[658,973,743],{"class":742},[658,975,976],{"class":746}," useLogger",[658,978,979],{"class":742},",",[658,981,747],{"class":746},[658,983,750],{"class":742},[658,985,753],{"class":738},[658,987,756],{"class":742},[658,989,759],{"class":668},[658,991,762],{"class":742},[658,993,994],{"class":660,"line":765},[658,995,769],{"emptyLinePlaceholder":768},[658,997,998,1000,1002,1004,1006,1008,1010,1012,1014,1016,1018,1020,1022,1024],{"class":660,"line":772},[658,999,775],{"class":738},[658,1001,779],{"class":778},[658,1003,782],{"class":746},[658,1005,785],{"class":742},[658,1007,747],{"class":788},[658,1009,791],{"class":746},[658,1011,794],{"class":778},[658,1013,797],{"class":742},[658,1015,801],{"class":800},[658,1017,804],{"class":742},[658,1019,807],{"class":664},[658,1021,810],{"class":742},[658,1023,813],{"class":778},[658,1025,816],{"class":742},[658,1027,1028,1030,1033,1035,1037],{"class":660,"line":819},[658,1029,822],{"class":778},[658,1031,1032],{"class":746}," log",[658,1034,828],{"class":742},[658,1036,976],{"class":788},[658,1038,1039],{"class":837},"()\n",[658,1041,1042,1044,1046,1048,1050,1052,1054,1056,1058,1060,1062,1064,1066,1068,1070,1072,1074,1076,1078,1080,1082,1084,1086],{"class":660,"line":883},[658,1043,822],{"class":778},[658,1045,825],{"class":746},[658,1047,828],{"class":742},[658,1049,831],{"class":742},[658,1051,834],{"class":788},[658,1053,791],{"class":837},[658,1055,801],{"class":746},[658,1057,842],{"class":742},[658,1059,845],{"class":746},[658,1061,810],{"class":837},[658,1063,842],{"class":742},[658,1065,852],{"class":746},[658,1067,842],{"class":742},[658,1069,857],{"class":788},[658,1071,791],{"class":837},[658,1073,862],{"class":742},[658,1075,865],{"class":668},[658,1077,862],{"class":742},[658,1079,870],{"class":837},[658,1081,873],{"class":742},[658,1083,756],{"class":742},[658,1085,878],{"class":668},[658,1087,762],{"class":742},[658,1089,1090,1093,1095,1098,1100,1102,1105,1107,1109,1112,1114,1116,1119,1121,1123,1125,1127,1129],{"class":660,"line":926},[658,1091,1092],{"class":746},"  log",[658,1094,842],{"class":742},[658,1096,1097],{"class":788},"set",[658,1099,791],{"class":837},[658,1101,899],{"class":742},[658,1103,1104],{"class":837}," greeting",[658,1106,804],{"class":742},[658,1108,743],{"class":742},[658,1110,1111],{"class":837}," personalized",[658,1113,804],{"class":742},[658,1115,825],{"class":746},[658,1117,1118],{"class":742}," !==",[658,1120,756],{"class":742},[658,1122,878],{"class":668},[658,1124,862],{"class":742},[658,1126,750],{"class":742},[658,1128,750],{"class":742},[658,1130,923],{"class":837},[658,1132,1134,1136,1138,1140,1142,1144,1146,1148,1150,1152,1154,1156,1158,1160,1162],{"class":660,"line":1133},7,[658,1135,886],{"class":738},[658,1137,889],{"class":746},[658,1139,842],{"class":742},[658,1141,894],{"class":788},[658,1143,791],{"class":837},[658,1145,899],{"class":742},[658,1147,902],{"class":837},[658,1149,804],{"class":742},[658,1151,907],{"class":742},[658,1153,910],{"class":668},[658,1155,913],{"class":742},[658,1157,865],{"class":746},[658,1159,918],{"class":742},[658,1161,750],{"class":742},[658,1163,923],{"class":837},[658,1165,1167,1169],{"class":660,"line":1166},8,[658,1168,929],{"class":742},[658,1170,923],{"class":746},[609,1172,1173,1174,1176],{},"Run the same command again. The ",[613,1175,634],{}," 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.",[609,1178,1179,1180,1183],{},"A passing check establishes that the pattern exists. It does not judge whether ",[613,1181,1182],{},"greeting.personalized"," is the field your incident investigation needs. Review the event output and required business fields separately.",[618,1185,1187],{"id":1186},"know-what-a-high-score-leaves-untested","Know what a high score leaves untested",[1189,1190,1191,1195,1198,1201],"ul",{},[1192,1193,1194],"li",{},"Source patterns do not prove runtime execution, complete error-path coverage, or successful delivery to a backend.",[1192,1196,1197],{},"Sensitivity classification uses imports and route paths. Inspect the reported reasons for money, authentication, or personal-data flags.",[1192,1199,1200],{},"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.",[1192,1202,1203],{},"Logging through wrappers or abstractions the analyzer does not recognize can produce false positives. Look at the code before applying a suggestion.",[609,1205,1206,1207,842],{},"A high score is useful for checking agreed conventions alongside runtime tests and ",[712,1208,1209],{"href":67},"sampled production events",[618,1211,1213],{"id":1212},"add-a-ci-gate-after-reviewing-the-baseline","Add a CI gate after reviewing the baseline",[609,1215,1216],{},"Pin the CLI version and keep the analyzed package, configuration, and exclusions consistent. Rule changes can change a score without an application edit.",[609,1218,1219,1220,1222,1223,1226,1227,1229,1230,1232,1233,1236],{},"Commit a reviewed ",[613,1221,641],{}," baseline and use ",[613,1224,1225],{},"--baseline"," to detect recognized requirement or score regressions on existing entries. It does not track every context field: removing one ",[613,1228,960],{}," call may still leave another call that satisfies ",[613,1231,634],{},". New entries also need review. Add ",[613,1234,1235],{},"--min-score"," when you want a floor on the current aggregate score, understanding that an average can hide one weak route.",[609,1238,710,1239,1242,1243,1246],{},[712,1240,1241],{"href":115},"CI guide"," covers exit codes and gate configuration. 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