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Events emitted before the promise settles are not published, so call it at startup rather than inside a request.",[670,671,673,674,677,678,681],"callout",{"color":672,"icon":13},"info","This is an observation side channel, not a transport. Subscribers run synchronously and are not awaited — no batching, no retry, no ",[545,675,676],{},"waitUntil",". For delivery to a backend, use a ",[539,679,680],{"href":491},"drain","; both see the same event.",[683,684,686],"h2",{"id":685},"subscribing","Subscribing",[536,688,689],{},"The point of the channel is that a consumer needs nothing from evlog but the channel name:",[561,691,694],{"className":563,"code":692,"filename":693,"language":566,"meta":567,"style":567},"import { subscribe } from 'node:diagnostics_channel'\n\nsubscribe('evlog.event', ({ event }) => {\n  if (event.level === 'error') metrics.increment('errors', { path: event.path })\n})\n","metrics.ts",[545,695,696,715,719,750,817],{"__ignoreMap":567},[571,697,698,700,702,705,707,709,711,713],{"class":573,"line":574},[571,699,578],{"class":577},[571,701,582],{"class":581},[571,703,704],{"class":585}," subscribe",[571,706,589],{"class":581},[571,708,592],{"class":577},[571,710,595],{"class":581},[571,712,547],{"class":598},[571,714,602],{"class":581},[571,716,717],{"class":573,"line":605},[571,718,609],{"emptyLinePlaceholder":608},[571,720,721,724,726,729,731,733,736,739,743,746,748],{"class":573,"line":612},[571,722,723],{"class":621},"subscribe",[571,725,625],{"class":585},[571,727,728],{"class":581},"'",[571,730,551],{"class":598},[571,732,728],{"class":581},[571,734,735],{"class":581},",",[571,737,738],{"class":581}," ({",[571,740,742],{"class":741},"sHdIc"," event",[571,744,745],{"class":581}," })",[571,747,635],{"class":628},[571,749,638],{"class":581},[571,751,752,755,758,761,763,766,769,771,774,776,779,782,784,787,789,791,794,796,798,800,803,806,808,810,813,815],{"class":573,"line":641},[571,753,754],{"class":577},"  if",[571,756,757],{"class":649}," (",[571,759,760],{"class":585},"event",[571,762,556],{"class":581},[571,764,765],{"class":585},"level",[571,767,768],{"class":581}," ===",[571,770,595],{"class":581},[571,772,773],{"class":598},"error",[571,775,728],{"class":581},[571,777,778],{"class":649},") ",[571,780,781],{"class":585},"metrics",[571,783,556],{"class":581},[571,785,786],{"class":621},"increment",[571,788,625],{"class":649},[571,790,728],{"class":581},[571,792,793],{"class":598},"errors",[571,795,728],{"class":581},[571,797,735],{"class":581},[571,799,582],{"class":581},[571,801,802],{"class":649}," path",[571,804,805],{"class":581},":",[571,807,742],{"class":585},[571,809,556],{"class":581},[571,811,812],{"class":585},"path",[571,814,589],{"class":581},[571,816,659],{"class":649},[571,818,819,821],{"class":573,"line":653},[571,820,656],{"class":581},[571,822,659],{"class":585},[536,824,825],{},"If you already depend on evlog and want the payload typed:",[561,827,830],{"className":563,"code":828,"filename":829,"language":566,"meta":567,"style":567},"import { subscribeToWideEvents } from 'evlog\u002Fdiagnostics'\n\nconst stop = await subscribeToWideEvents((event) => {\n  \u002F\u002F                                       ^? WideEvent\n  if (typeof event.status === 'number' && event.status >= 500) {\n    alerts.push({ path: String(event.path ?? '-'), requestId: String(event.requestId ?? '-') })\n  }\n})\n","alerts.ts",[545,831,832,851,855,884,890,936,1011,1017],{"__ignoreMap":567},[571,833,834,836,838,841,843,845,847,849],{"class":573,"line":574},[571,835,578],{"class":577},[571,837,582],{"class":581},[571,839,840],{"class":585}," subscribeToWideEvents",[571,842,589],{"class":581},[571,844,592],{"class":577},[571,846,595],{"class":581},[571,848,599],{"class":598},[571,850,602],{"class":581},[571,852,853],{"class":573,"line":605},[571,854,609],{"emptyLinePlaceholder":608},[571,856,857,860,863,866,869,871,873,875,877,880,882],{"class":573,"line":612},[571,858,859],{"class":628},"const",[571,861,862],{"class":585}," stop ",[571,864,865],{"class":581},"=",[571,867,868],{"class":577}," await",[571,870,840],{"class":621},[571,872,625],{"class":585},[571,874,625],{"class":581},[571,876,760],{"class":741},[571,878,879],{"class":581},")",[571,881,635],{"class":628},[571,883,638],{"class":581},[571,885,886],{"class":573,"line":641},[571,887,889],{"class":888},"sHwdD","  \u002F\u002F                                       ^? WideEvent\n",[571,891,892,894,896,899,901,903,906,908,910,913,915,918,920,922,924,927,931,933],{"class":573,"line":653},[571,893,754],{"class":577},[571,895,757],{"class":649},[571,897,898],{"class":581},"typeof",[571,900,742],{"class":585},[571,902,556],{"class":581},[571,904,905],{"class":585},"status",[571,907,768],{"class":581},[571,909,595],{"class":581},[571,911,912],{"class":598},"number",[571,914,728],{"class":581},[571,916,917],{"class":581}," &&",[571,919,742],{"class":585},[571,921,556],{"class":581},[571,923,905],{"class":585},[571,925,926],{"class":581}," >=",[571,928,930],{"class":929},"sbssI"," 500",[571,932,778],{"class":649},[571,934,935],{"class":581},"{\n",[571,937,939,942,944,947,949,952,954,956,959,961,963,965,967,970,972,975,977,979,981,984,986,988,990,992,994,997,999,1001,1003,1005,1007,1009],{"class":573,"line":938},6,[571,940,941],{"class":585},"    alerts",[571,943,556],{"class":581},[571,945,946],{"class":621},"push",[571,948,625],{"class":649},[571,950,951],{"class":581},"{",[571,953,802],{"class":649},[571,955,805],{"class":581},[571,957,958],{"class":621}," String",[571,960,625],{"class":649},[571,962,760],{"class":585},[571,964,556],{"class":581},[571,966,812],{"class":585},[571,968,969],{"class":581}," ??",[571,971,595],{"class":581},[571,973,974],{"class":598},"-",[571,976,728],{"class":581},[571,978,879],{"class":649},[571,980,735],{"class":581},[571,982,983],{"class":649}," requestId",[571,985,805],{"class":581},[571,987,958],{"class":621},[571,989,625],{"class":649},[571,991,760],{"class":585},[571,993,556],{"class":581},[571,995,996],{"class":585},"requestId",[571,998,969],{"class":581},[571,1000,595],{"class":581},[571,1002,974],{"class":598},[571,1004,728],{"class":581},[571,1006,778],{"class":649},[571,1008,656],{"class":581},[571,1010,659],{"class":649},[571,1012,1014],{"class":573,"line":1013},7,[571,1015,1016],{"class":581},"  }\n",[571,1018,1020,1022],{"class":573,"line":1019},8,[571,1021,656],{"class":581},[571,1023,659],{"class":585},[536,1025,1026,1027,1030,1031,1034],{},"Fields beyond the ",[539,1028,1029],{"href":47},"base event"," are typed ",[545,1032,1033],{},"unknown",", and events emitted outside a request carry no HTTP fields at all — narrow before using them rather than casting.",[683,1036,1038],{"id":1037},"what-a-subscriber-receives","What a subscriber receives",[536,1040,1041],{},"The same object a drain receives: post-audit, post-redaction, post-enrich. Requests carry everything enrichers added — geo, user agent, trace context:",[561,1043,1047],{"className":1044,"code":1045,"language":1046,"meta":567,"style":567},"language-json shiki shiki-themes material-theme-lighter material-theme material-theme-palenight","{\n  \"timestamp\": \"2026-08-02T10:23:45.612Z\",\n  \"level\": \"error\",\n  \"service\": \"checkout\",\n  \"environment\": \"production\",\n  \"method\": \"POST\",\n  \"path\": \"\u002Fapi\u002Fcheckout\",\n  \"status\": 500,\n  \"duration\": \"1.20s\",\n  \"requestId\": \"4a8ff3a8-...\",\n  \"user\": { \"id\": \"usr_123\", \"plan\": \"premium\" },\n  \"error\": { \"name\": \"PaymentDeclined\", \"message\": \"Card declined\" }\n}\n","json",[545,1048,1049,1053,1077,1095,1115,1135,1155,1174,1188,1209,1229,1281,1331],{"__ignoreMap":567},[571,1050,1051],{"class":573,"line":574},[571,1052,935],{"class":581},[571,1054,1055,1058,1061,1064,1066,1069,1072,1074],{"class":573,"line":605},[571,1056,1057],{"class":581},"  \"",[571,1059,1060],{"class":628},"timestamp",[571,1062,1063],{"class":581},"\"",[571,1065,805],{"class":581},[571,1067,1068],{"class":581}," \"",[571,1070,1071],{"class":598},"2026-08-02T10:23:45.612Z",[571,1073,1063],{"class":581},[571,1075,1076],{"class":581},",\n",[571,1078,1079,1081,1083,1085,1087,1089,1091,1093],{"class":573,"line":612},[571,1080,1057],{"class":581},[571,1082,765],{"class":628},[571,1084,1063],{"class":581},[571,1086,805],{"class":581},[571,1088,1068],{"class":581},[571,1090,773],{"class":598},[571,1092,1063],{"class":581},[571,1094,1076],{"class":581},[571,1096,1097,1099,1102,1104,1106,1108,1111,1113],{"class":573,"line":641},[571,1098,1057],{"class":581},[571,1100,1101],{"class":628},"service",[571,1103,1063],{"class":581},[571,1105,805],{"class":581},[571,1107,1068],{"class":581},[571,1109,1110],{"class":598},"checkout",[571,1112,1063],{"class":581},[571,1114,1076],{"class":581},[571,1116,1117,1119,1122,1124,1126,1128,1131,1133],{"class":573,"line":653},[571,1118,1057],{"class":581},[571,1120,1121],{"class":628},"environment",[571,1123,1063],{"class":581},[571,1125,805],{"class":581},[571,1127,1068],{"class":581},[571,1129,1130],{"class":598},"production",[571,1132,1063],{"class":581},[571,1134,1076],{"class":581},[571,1136,1137,1139,1142,1144,1146,1148,1151,1153],{"class":573,"line":938},[571,1138,1057],{"class":581},[571,1140,1141],{"class":628},"method",[571,1143,1063],{"class":581},[571,1145,805],{"class":581},[571,1147,1068],{"class":581},[571,1149,1150],{"class":598},"POST",[571,1152,1063],{"class":581},[571,1154,1076],{"class":581},[571,1156,1157,1159,1161,1163,1165,1167,1170,1172],{"class":573,"line":1013},[571,1158,1057],{"class":581},[571,1160,812],{"class":628},[571,1162,1063],{"class":581},[571,1164,805],{"class":581},[571,1166,1068],{"class":581},[571,1168,1169],{"class":598},"\u002Fapi\u002Fcheckout",[571,1171,1063],{"class":581},[571,1173,1076],{"class":581},[571,1175,1176,1178,1180,1182,1184,1186],{"class":573,"line":1019},[571,1177,1057],{"class":581},[571,1179,905],{"class":628},[571,1181,1063],{"class":581},[571,1183,805],{"class":581},[571,1185,930],{"class":929},[571,1187,1076],{"class":581},[571,1189,1191,1193,1196,1198,1200,1202,1205,1207],{"class":573,"line":1190},9,[571,1192,1057],{"class":581},[571,1194,1195],{"class":628},"duration",[571,1197,1063],{"class":581},[571,1199,805],{"class":581},[571,1201,1068],{"class":581},[571,1203,1204],{"class":598},"1.20s",[571,1206,1063],{"class":581},[571,1208,1076],{"class":581},[571,1210,1212,1214,1216,1218,1220,1222,1225,1227],{"class":573,"line":1211},10,[571,1213,1057],{"class":581},[571,1215,996],{"class":628},[571,1217,1063],{"class":581},[571,1219,805],{"class":581},[571,1221,1068],{"class":581},[571,1223,1224],{"class":598},"4a8ff3a8-...",[571,1226,1063],{"class":581},[571,1228,1076],{"class":581},[571,1230,1232,1234,1237,1239,1241,1243,1245,1249,1251,1253,1255,1258,1260,1262,1264,1267,1269,1271,1273,1276,1278],{"class":573,"line":1231},11,[571,1233,1057],{"class":581},[571,1235,1236],{"class":628},"user",[571,1238,1063],{"class":581},[571,1240,805],{"class":581},[571,1242,582],{"class":581},[571,1244,1068],{"class":581},[571,1246,1248],{"class":1247},"sBMFI","id",[571,1250,1063],{"class":581},[571,1252,805],{"class":581},[571,1254,1068],{"class":581},[571,1256,1257],{"class":598},"usr_123",[571,1259,1063],{"class":581},[571,1261,735],{"class":581},[571,1263,1068],{"class":581},[571,1265,1266],{"class":1247},"plan",[571,1268,1063],{"class":581},[571,1270,805],{"class":581},[571,1272,1068],{"class":581},[571,1274,1275],{"class":598},"premium",[571,1277,1063],{"class":581},[571,1279,1280],{"class":581}," },\n",[571,1282,1284,1286,1288,1290,1292,1294,1296,1299,1301,1303,1305,1308,1310,1312,1314,1317,1319,1321,1323,1326,1328],{"class":573,"line":1283},12,[571,1285,1057],{"class":581},[571,1287,773],{"class":628},[571,1289,1063],{"class":581},[571,1291,805],{"class":581},[571,1293,582],{"class":581},[571,1295,1068],{"class":581},[571,1297,1298],{"class":1247},"name",[571,1300,1063],{"class":581},[571,1302,805],{"class":581},[571,1304,1068],{"class":581},[571,1306,1307],{"class":598},"PaymentDeclined",[571,1309,1063],{"class":581},[571,1311,735],{"class":581},[571,1313,1068],{"class":581},[571,1315,1316],{"class":1247},"message",[571,1318,1063],{"class":581},[571,1320,805],{"class":581},[571,1322,1068],{"class":581},[571,1324,1325],{"class":598},"Card declined",[571,1327,1063],{"class":581},[571,1329,1330],{"class":581}," }\n",[571,1332,1334],{"class":573,"line":1333},13,[571,1335,1336],{"class":581},"}\n",[536,1338,1339,1340,1343,1344,1347,1348,1351,1352,1355,1356,556],{},"Events emitted outside a request (",[545,1341,1342],{},"log.info({ ... })",", ",[545,1345,1346],{},"createLogger().emit()",") arrive without the HTTP fields, and events from ",[545,1349,1350],{},"log.fork()"," carry ",[545,1353,1354],{},"operation"," and ",[545,1357,1358],{},"_parentRequestId",[670,1360,1363,1364,1368,1369,1372],{"color":1361,"icon":1362},"warning","i-lucide-triangle-alert","The event is the live object, not a copy — mutating it mutates what drains receive. Treat it as read-only. And a subscriber that throws is ",[1365,1366,1367],"strong",{},"not"," contained: ",[545,1370,1371],{},"Channel.publish()"," re-raises it as an uncaught exception on the next tick, which is fatal in most apps. Keep subscribers total.",[536,1374,1375,1376,1379],{},"In pretty mode (the dev default), tagged logs like ",[545,1377,1378],{},"log.info('auth', 'User logged in')"," are written straight to the console and never become wide events, so they do not appear on the channel. Wide events themselves are published in both modes.",[683,1381,285],{"id":1382},"cloudflare-workers",[536,1384,1385,1386,1391,1392,1394],{},"Workers forwards every diagnostics channel message to a ",[539,1387,1390],{"href":1388,"rel":1389},"https:\u002F\u002Fdevelopers.cloudflare.com\u002Fworkers\u002Fobservability\u002Flogs\u002Ftail-workers\u002F",[543],"Tail Worker"," automatically. Enable the channel and your wide events leave the isolate with no drain, no ",[545,1393,676],{},", and their own CPU budget:",[561,1396,1399],{"className":563,"code":1397,"filename":1398,"language":566,"meta":567,"style":567},"export default {\n  tail(events) {\n    for (const event of events) {\n      for (const message of event.diagnosticsChannelEvents ?? 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