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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":1444,"extension":1445,"links":1446,"meta":1453,"navigation":1454,"path":598,"seo":1455,"stem":599,"__hash__":1456},"docs\u002F8.compare\u002F2.opentelemetry.md","evlog and OpenTelemetry: connect logs to traces",{"type":616,"value":617,"toc":1438},"minimark",[618,622,627,639,650,654,663,666,693,700,1184,1187,1203,1213,1216,1338,1345,1349,1365,1387,1401,1405,1414,1420,1434],[619,620,621],"p",{},"You already export traces to an OpenTelemetry Collector and want application logs beside them. evlog can build those log events and send them through OTLP. Keep the tracing instrumentation: evlog does not create spans or metrics.",[623,624,626],"h2",{"id":625},"assign-each-layer-a-job","Assign each layer a job",[628,629,636],"pre",{"className":630,"code":632,"filename":633,"language":634,"meta":635},[631],"language-text","Application fields -> evlog event -> OTLP HTTP \u002Fv1\u002Flogs -> Collector -> backend\nActive OTel span  -> traceId + spanId on the event\nOTel SDK         -> spans and metrics                -> Collector -> backend\n","Data flow","text","",[637,638,632],"code",{"__ignoreMap":635},[619,640,641,642,649],{},"The SDK instruments operations, the Collector receives and processes telemetry, and the backend provides storage, queries, and alerts. ",[643,644,648],"a",{"href":645,"rel":646},"https:\u002F\u002Fopentelemetry.io\u002Fdocs\u002F",[647],"nofollow","OpenTelemetry's documentation"," describes those responsibilities. Semantic conventions standardize shared attributes, while custom application attributes remain valid.",[623,651,653],{"id":652},"export-an-event-with-the-active-span-context","Export an event with the active span context",[619,655,656,657,662],{},"This example assumes a Node.js application with its OpenTelemetry SDK and context manager already initialized. The function must run inside an active span to attach trace context. Follow the ",[643,658,661],{"href":659,"rel":660},"https:\u002F\u002Fopentelemetry.io\u002Fdocs\u002Flanguages\u002Fjs\u002Finstrumentation\u002F",[647],"JavaScript instrumentation guide"," if tracing is not configured yet.",[619,664,665],{},"Install the logging package and OTel API in that application:",[628,667,672],{"className":668,"code":669,"filename":670,"language":671,"meta":635,"style":635},"language-bash shiki shiki-themes material-theme-lighter material-theme material-theme-palenight","npm install evlog @opentelemetry\u002Fapi\n","Terminal","bash",[637,673,674],{"__ignoreMap":635},[675,676,679,683,687,690],"span",{"class":677,"line":678},"line",1,[675,680,682],{"class":681},"sBMFI","npm",[675,684,686],{"class":685},"sfazB"," install",[675,688,689],{"class":685}," evlog",[675,691,692],{"class":685}," @opentelemetry\u002Fapi\n",[619,694,695,696,699],{},"The function writes a completed checkout event as local JSON and exports it through OTLP. It awaits delivery explicitly: a failed export is logged with the drain name and does not throw, so the request path never breaks. Use ",[637,697,698],{},"drain.raw({ event })"," when the caller must observe failures. Do not also register this drain globally, which would export the event twice.",[628,701,706],{"className":702,"code":703,"filename":704,"language":705,"meta":635,"style":635},"language-typescript shiki shiki-themes material-theme-lighter material-theme material-theme-palenight","import { isSpanContextValid, trace } from '@opentelemetry\u002Fapi'\nimport { createLogger, initLogger } from 'evlog'\nimport { createOTLPDrain } from 'evlog\u002Fotlp'\n\ninitLogger({ env: { service: 'checkout' }, pretty: false })\nconst drain = createOTLPDrain({ recordShape: 'compact' })\n\nexport async function recordCheckout(orderId: string, outcome: 'paid' | 'declined') {\n  const log = createLogger({ orderId, outcome })\n  const spanContext = trace.getActiveSpan()?.spanContext()\n  if (spanContext && isSpanContextValid(spanContext)) {\n    log.set({ traceId: spanContext.traceId, spanId: spanContext.spanId })\n  }\n  if (outcome === 'declined') log.error(new Error('Payment declined'))\n  const event = log.emit()\n  if (event) await drain({ event })\n}\n","checkout-log.ts","typescript",[637,707,708,743,769,790,797,849,884,889,945,974,1004,1030,1075,1081,1131,1150,1178],{"__ignoreMap":635},[675,709,710,714,718,722,725,728,731,734,737,740],{"class":677,"line":678},[675,711,713],{"class":712},"s7zQu","import",[675,715,717],{"class":716},"sMK4o"," {",[675,719,721],{"class":720},"sTEyZ"," isSpanContextValid",[675,723,724],{"class":716},",",[675,726,727],{"class":720}," trace",[675,729,730],{"class":716}," }",[675,732,733],{"class":712}," from",[675,735,736],{"class":716}," '",[675,738,739],{"class":685},"@opentelemetry\u002Fapi",[675,741,742],{"class":716},"'\n",[675,744,746,748,750,753,755,758,760,762,764,767],{"class":677,"line":745},2,[675,747,713],{"class":712},[675,749,717],{"class":716},[675,751,752],{"class":720}," createLogger",[675,754,724],{"class":716},[675,756,757],{"class":720}," initLogger",[675,759,730],{"class":716},[675,761,733],{"class":712},[675,763,736],{"class":716},[675,765,766],{"class":685},"evlog",[675,768,742],{"class":716},[675,770,772,774,776,779,781,783,785,788],{"class":677,"line":771},3,[675,773,713],{"class":712},[675,775,717],{"class":716},[675,777,778],{"class":720}," createOTLPDrain",[675,780,730],{"class":716},[675,782,733],{"class":712},[675,784,736],{"class":716},[675,786,787],{"class":685},"evlog\u002Fotlp",[675,789,742],{"class":716},[675,791,793],{"class":677,"line":792},4,[675,794,796],{"emptyLinePlaceholder":795},true,"\n",[675,798,800,804,807,810,814,817,819,822,824,826,829,832,835,838,840,844,846],{"class":677,"line":799},5,[675,801,803],{"class":802},"s2Zo4","initLogger",[675,805,806],{"class":720},"(",[675,808,809],{"class":716},"{",[675,811,813],{"class":812},"swJcz"," env",[675,815,816],{"class":716},":",[675,818,717],{"class":716},[675,820,821],{"class":812}," service",[675,823,816],{"class":716},[675,825,736],{"class":716},[675,827,828],{"class":685},"checkout",[675,830,831],{"class":716},"'",[675,833,834],{"class":716}," },",[675,836,837],{"class":812}," pretty",[675,839,816],{"class":716},[675,841,843],{"class":842},"sfNiH"," false",[675,845,730],{"class":716},[675,847,848],{"class":720},")\n",[675,850,852,856,859,862,864,866,868,871,873,875,878,880,882],{"class":677,"line":851},6,[675,853,855],{"class":854},"spNyl","const",[675,857,858],{"class":720}," drain ",[675,860,861],{"class":716},"=",[675,863,778],{"class":802},[675,865,806],{"class":720},[675,867,809],{"class":716},[675,869,870],{"class":812}," recordShape",[675,872,816],{"class":716},[675,874,736],{"class":716},[675,876,877],{"class":685},"compact",[675,879,831],{"class":716},[675,881,730],{"class":716},[675,883,848],{"class":720},[675,885,887],{"class":677,"line":886},7,[675,888,796],{"emptyLinePlaceholder":795},[675,890,892,895,898,901,904,906,910,912,915,917,920,922,924,927,929,932,934,937,939,942],{"class":677,"line":891},8,[675,893,894],{"class":712},"export",[675,896,897],{"class":854}," async",[675,899,900],{"class":854}," function",[675,902,903],{"class":802}," recordCheckout",[675,905,806],{"class":716},[675,907,909],{"class":908},"sHdIc","orderId",[675,911,816],{"class":716},[675,913,914],{"class":681}," string",[675,916,724],{"class":716},[675,918,919],{"class":908}," outcome",[675,921,816],{"class":716},[675,923,736],{"class":716},[675,925,926],{"class":685},"paid",[675,928,831],{"class":716},[675,930,931],{"class":716}," |",[675,933,736],{"class":716},[675,935,936],{"class":685},"declined",[675,938,831],{"class":716},[675,940,941],{"class":716},")",[675,943,944],{"class":716}," {\n",[675,946,948,951,954,957,959,961,963,966,968,970,972],{"class":677,"line":947},9,[675,949,950],{"class":854},"  const",[675,952,953],{"class":720}," log",[675,955,956],{"class":716}," =",[675,958,752],{"class":802},[675,960,806],{"class":812},[675,962,809],{"class":716},[675,964,965],{"class":720}," orderId",[675,967,724],{"class":716},[675,969,919],{"class":720},[675,971,730],{"class":716},[675,973,848],{"class":812},[675,975,977,979,982,984,986,989,992,995,998,1001],{"class":677,"line":976},10,[675,978,950],{"class":854},[675,980,981],{"class":720}," spanContext",[675,983,956],{"class":716},[675,985,727],{"class":720},[675,987,988],{"class":716},".",[675,990,991],{"class":802},"getActiveSpan",[675,993,994],{"class":812},"()",[675,996,997],{"class":716},"?.",[675,999,1000],{"class":802},"spanContext",[675,1002,1003],{"class":812},"()\n",[675,1005,1007,1010,1013,1015,1018,1020,1022,1024,1027],{"class":677,"line":1006},11,[675,1008,1009],{"class":712},"  if",[675,1011,1012],{"class":812}," (",[675,1014,1000],{"class":720},[675,1016,1017],{"class":716}," &&",[675,1019,721],{"class":802},[675,1021,806],{"class":812},[675,1023,1000],{"class":720},[675,1025,1026],{"class":812},")) ",[675,1028,1029],{"class":716},"{\n",[675,1031,1033,1036,1038,1041,1043,1045,1048,1050,1052,1054,1057,1059,1062,1064,1066,1068,1071,1073],{"class":677,"line":1032},12,[675,1034,1035],{"class":720},"    log",[675,1037,988],{"class":716},[675,1039,1040],{"class":802},"set",[675,1042,806],{"class":812},[675,1044,809],{"class":716},[675,1046,1047],{"class":812}," traceId",[675,1049,816],{"class":716},[675,1051,981],{"class":720},[675,1053,988],{"class":716},[675,1055,1056],{"class":720},"traceId",[675,1058,724],{"class":716},[675,1060,1061],{"class":812}," spanId",[675,1063,816],{"class":716},[675,1065,981],{"class":720},[675,1067,988],{"class":716},[675,1069,1070],{"class":720},"spanId",[675,1072,730],{"class":716},[675,1074,848],{"class":812},[675,1076,1078],{"class":677,"line":1077},13,[675,1079,1080],{"class":716},"  }\n",[675,1082,1084,1086,1088,1091,1094,1096,1098,1100,1103,1106,1108,1111,1113,1116,1119,1121,1123,1126,1128],{"class":677,"line":1083},14,[675,1085,1009],{"class":712},[675,1087,1012],{"class":812},[675,1089,1090],{"class":720},"outcome",[675,1092,1093],{"class":716}," ===",[675,1095,736],{"class":716},[675,1097,936],{"class":685},[675,1099,831],{"class":716},[675,1101,1102],{"class":812},") ",[675,1104,1105],{"class":720},"log",[675,1107,988],{"class":716},[675,1109,1110],{"class":802},"error",[675,1112,806],{"class":812},[675,1114,1115],{"class":716},"new",[675,1117,1118],{"class":802}," Error",[675,1120,806],{"class":812},[675,1122,831],{"class":716},[675,1124,1125],{"class":685},"Payment declined",[675,1127,831],{"class":716},[675,1129,1130],{"class":812},"))\n",[675,1132,1134,1136,1139,1141,1143,1145,1148],{"class":677,"line":1133},15,[675,1135,950],{"class":854},[675,1137,1138],{"class":720}," event",[675,1140,956],{"class":716},[675,1142,953],{"class":720},[675,1144,988],{"class":716},[675,1146,1147],{"class":802},"emit",[675,1149,1003],{"class":812},[675,1151,1153,1155,1157,1160,1162,1165,1168,1170,1172,1174,1176],{"class":677,"line":1152},16,[675,1154,1009],{"class":712},[675,1156,1012],{"class":812},[675,1158,1159],{"class":720},"event",[675,1161,1102],{"class":812},[675,1163,1164],{"class":712},"await",[675,1166,1167],{"class":802}," drain",[675,1169,806],{"class":812},[675,1171,809],{"class":716},[675,1173,1138],{"class":720},[675,1175,730],{"class":716},[675,1177,848],{"class":812},[675,1179,1181],{"class":677,"line":1180},17,[675,1182,1183],{"class":716},"}\n",[619,1185,1186],{},"Configure the OTLP HTTP base endpoint in the application's environment. If it is unset, the drain logs a missing-endpoint warning and skips delivery:",[628,1188,1191],{"className":668,"code":1189,"filename":1190,"language":671,"meta":635,"style":635},"OTLP_ENDPOINT=http:\u002F\u002Flocalhost:4318\n",".env",[637,1192,1193],{"__ignoreMap":635},[675,1194,1195,1198,1200],{"class":677,"line":678},[675,1196,1197],{"class":720},"OTLP_ENDPOINT",[675,1199,861],{"class":716},[675,1201,1202],{"class":685},"http:\u002F\u002Flocalhost:4318\n",[619,1204,1205,1206,1209,1210,1212],{},"Load that file through your application or Node's ",[637,1207,1208],{},"--env-file"," option. A file named ",[637,1211,1190],{}," alone does not configure an arbitrary Node.js process.",[619,1214,1215],{},"For a local Collector, enable a logs pipeline. This minimal configuration prints received records through the debug exporter:",[628,1217,1222],{"className":1218,"code":1219,"filename":1220,"language":1221,"meta":635,"style":635},"language-yaml shiki shiki-themes material-theme-lighter material-theme material-theme-palenight","receivers:\n  otlp:\n    protocols:\n      http:\n        endpoint: 127.0.0.1:4318\nexporters:\n  debug:\n    verbosity: detailed\nservice:\n  pipelines:\n    logs:\n      receivers: [otlp]\n      exporters: [debug]\n","otel-collector.yaml","yaml",[637,1223,1224,1232,1239,1246,1253,1263,1270,1277,1287,1294,1301,1308,1324],{"__ignoreMap":635},[675,1225,1226,1229],{"class":677,"line":678},[675,1227,1228],{"class":812},"receivers",[675,1230,1231],{"class":716},":\n",[675,1233,1234,1237],{"class":677,"line":745},[675,1235,1236],{"class":812},"  otlp",[675,1238,1231],{"class":716},[675,1240,1241,1244],{"class":677,"line":771},[675,1242,1243],{"class":812},"    protocols",[675,1245,1231],{"class":716},[675,1247,1248,1251],{"class":677,"line":792},[675,1249,1250],{"class":812},"      http",[675,1252,1231],{"class":716},[675,1254,1255,1258,1260],{"class":677,"line":799},[675,1256,1257],{"class":812},"        endpoint",[675,1259,816],{"class":716},[675,1261,1262],{"class":685}," 127.0.0.1:4318\n",[675,1264,1265,1268],{"class":677,"line":851},[675,1266,1267],{"class":812},"exporters",[675,1269,1231],{"class":716},[675,1271,1272,1275],{"class":677,"line":886},[675,1273,1274],{"class":812},"  debug",[675,1276,1231],{"class":716},[675,1278,1279,1282,1284],{"class":677,"line":891},[675,1280,1281],{"class":812},"    verbosity",[675,1283,816],{"class":716},[675,1285,1286],{"class":685}," detailed\n",[675,1288,1289,1292],{"class":677,"line":947},[675,1290,1291],{"class":812},"service",[675,1293,1231],{"class":716},[675,1295,1296,1299],{"class":677,"line":976},[675,1297,1298],{"class":812},"  pipelines",[675,1300,1231],{"class":716},[675,1302,1303,1306],{"class":677,"line":1006},[675,1304,1305],{"class":812},"    logs",[675,1307,1231],{"class":716},[675,1309,1310,1313,1315,1318,1321],{"class":677,"line":1032},[675,1311,1312],{"class":812},"      receivers",[675,1314,816],{"class":716},[675,1316,1317],{"class":716}," [",[675,1319,1320],{"class":685},"otlp",[675,1322,1323],{"class":716},"]\n",[675,1325,1326,1329,1331,1333,1336],{"class":677,"line":1077},[675,1327,1328],{"class":812},"      exporters",[675,1330,816],{"class":716},[675,1332,1317],{"class":716},[675,1334,1335],{"class":685},"debug",[675,1337,1323],{"class":716},[619,1339,1340,1341,1344],{},"Run the Collector with this configuration and call ",[637,1342,1343],{},"recordCheckout('order-123', 'paid')"," inside an instrumented operation. A Collector in a separate container needs a reachable receiver address and port mapping. Use the loopback configuration above for processes on the same host.",[623,1346,1348],{"id":1347},"verify-correlation-before-shipping","Verify correlation before shipping",[619,1350,1351,1352,1354,1355,1358,1359,1361,1362,1364],{},"Find the record by ",[637,1353,909],{},". Its resource should contain ",[637,1356,1357],{},"service.name: checkout",", and its ",[637,1360,1056],{}," and ",[637,1363,1070],{}," should match the active span from the same operation. Without a valid active span the event still exports, but those identifiers are absent.",[619,1366,1367,1368,1371,1372,1375,1376,1361,1379,1382,1383,1386],{},"The drain maps level and timestamp to OTLP severity and time fields. With ",[637,1369,1370],{},"recordShape: 'compact'",", nested application fields become dotted attributes. The default JSON shape uses a serialized event body and sends nested attribute values as OTLP key-value lists. Set ",[637,1373,1374],{},"semanticConventions: true"," to add OpenTelemetry attribute names such as ",[637,1377,1378],{},"http.request.method",[637,1380,1381],{},"gen_ai.usage.input_tokens"," next to the evlog ones. The ",[643,1384,1385],{"href":212},"OTLP adapter reference"," describes the mapping and delivery options.",[619,1388,1389,1390,1393,1394,1397,1398,1400],{},"The TraceContext enricher reads an incoming ",[637,1391,1392],{},"traceparent"," and records its span identifier as ",[637,1395,1396],{},"parentSpanId",", because that span belongs to the caller. It never sets ",[637,1399,1070],{},". Use the active SDK context as above to link the event to the server span.",[623,1402,1404],{"id":1403},"decide-what-to-sample-and-how-to-deliver","Decide what to sample and how to deliver",[619,1406,1407,1408,1413],{},"Event sampling in evlog and ",[643,1409,1412],{"href":1410,"rel":1411},"https:\u002F\u002Fopentelemetry.io\u002Fdocs\u002Fconcepts\u002Fsampling\u002F",[647],"trace sampling in OpenTelemetry"," operate on different signals. A retained log can reference a trace that your tracing policy discarded. Coordinate the policies before relying on navigation from every error log to a stored trace.",[619,1415,1416,1417,1419],{},"This example waits for the network request. For production handler integration, configure the drain pipeline and the framework's background-delivery lifecycle deliberately. The adapter supports OTLP HTTP logs, not a gRPC-only endpoint. Serialization, batching, retries, and export add costs that event-construction microbenchmarks do not measure. See ",[643,1418,393],{"href":562}," for those boundaries.",[619,1421,1422,1423,1426,1427,1430,1431,988],{},"If you use Nitro, the integration can invoke ",[637,1424,1425],{},"createOTLPDrain()"," through ",[637,1428,1429],{},"evlog:drain"," after evlog is enabled. Keep your existing OTel instrumentation in either setup. 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