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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:",[561,827,829],{"className":563,"code":828,"filename":693,"language":566,"meta":567,"style":567},"import { subscribeToWideEvents } from 'evlog\u002Fdiagnostics'\n\nconst stop = await subscribeToWideEvents((event) => {\n  \u002F\u002F                                       ^? WideEvent\n  metrics.timing('http.request', event.durationMs ?? 0, { path: event.path as string })\n})\n",[545,830,831,850,854,883,889,949],{"__ignoreMap":567},[571,832,833,835,837,840,842,844,846,848],{"class":573,"line":574},[571,834,578],{"class":577},[571,836,582],{"class":581},[571,838,839],{"class":585}," subscribeToWideEvents",[571,841,589],{"class":581},[571,843,592],{"class":577},[571,845,595],{"class":581},[571,847,599],{"class":598},[571,849,602],{"class":581},[571,851,852],{"class":573,"line":605},[571,853,609],{"emptyLinePlaceholder":608},[571,855,856,859,862,865,868,870,872,874,876,879,881],{"class":573,"line":612},[571,857,858],{"class":628},"const",[571,860,861],{"class":585}," stop ",[571,863,864],{"class":581},"=",[571,866,867],{"class":577}," await",[571,869,839],{"class":621},[571,871,625],{"class":585},[571,873,625],{"class":581},[571,875,760],{"class":741},[571,877,878],{"class":581},")",[571,880,635],{"class":628},[571,882,638],{"class":581},[571,884,885],{"class":573,"line":641},[571,886,888],{"class":887},"sHwdD","  \u002F\u002F                                       ^? WideEvent\n",[571,890,891,894,896,899,901,903,906,908,910,912,914,917,920,924,926,928,930,932,934,936,938,941,945,947],{"class":573,"line":653},[571,892,893],{"class":585},"  metrics",[571,895,556],{"class":581},[571,897,898],{"class":621},"timing",[571,900,625],{"class":649},[571,902,728],{"class":581},[571,904,905],{"class":598},"http.request",[571,907,728],{"class":581},[571,909,735],{"class":581},[571,911,742],{"class":585},[571,913,556],{"class":581},[571,915,916],{"class":585},"durationMs",[571,918,919],{"class":581}," ??",[571,921,923],{"class":922},"sbssI"," 0",[571,925,735],{"class":581},[571,927,582],{"class":581},[571,929,802],{"class":649},[571,931,805],{"class":581},[571,933,742],{"class":585},[571,935,556],{"class":581},[571,937,812],{"class":585},[571,939,940],{"class":577}," as",[571,942,944],{"class":943},"sBMFI"," string",[571,946,589],{"class":581},[571,948,659],{"class":649},[571,950,952,954],{"class":573,"line":951},6,[571,953,656],{"class":581},[571,955,659],{"class":585},[683,957,959],{"id":958},"what-a-subscriber-receives","What a subscriber receives",[536,961,962],{},"The same object a drain receives: post-audit, post-redaction, post-enrich. Requests carry everything enrichers added — geo, user agent, trace context:",[561,964,968],{"className":965,"code":966,"language":967,"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",[545,969,970,975,999,1017,1037,1057,1077,1097,1114,1135,1156,1207,1257],{"__ignoreMap":567},[571,971,972],{"class":573,"line":574},[571,973,974],{"class":581},"{\n",[571,976,977,980,983,986,988,991,994,996],{"class":573,"line":605},[571,978,979],{"class":581},"  \"",[571,981,982],{"class":628},"timestamp",[571,984,985],{"class":581},"\"",[571,987,805],{"class":581},[571,989,990],{"class":581}," \"",[571,992,993],{"class":598},"2026-08-02T10:23:45.612Z",[571,995,985],{"class":581},[571,997,998],{"class":581},",\n",[571,1000,1001,1003,1005,1007,1009,1011,1013,1015],{"class":573,"line":612},[571,1002,979],{"class":581},[571,1004,765],{"class":628},[571,1006,985],{"class":581},[571,1008,805],{"class":581},[571,1010,990],{"class":581},[571,1012,773],{"class":598},[571,1014,985],{"class":581},[571,1016,998],{"class":581},[571,1018,1019,1021,1024,1026,1028,1030,1033,1035],{"class":573,"line":641},[571,1020,979],{"class":581},[571,1022,1023],{"class":628},"service",[571,1025,985],{"class":581},[571,1027,805],{"class":581},[571,1029,990],{"class":581},[571,1031,1032],{"class":598},"checkout",[571,1034,985],{"class":581},[571,1036,998],{"class":581},[571,1038,1039,1041,1044,1046,1048,1050,1053,1055],{"class":573,"line":653},[571,1040,979],{"class":581},[571,1042,1043],{"class":628},"environment",[571,1045,985],{"class":581},[571,1047,805],{"class":581},[571,1049,990],{"class":581},[571,1051,1052],{"class":598},"production",[571,1054,985],{"class":581},[571,1056,998],{"class":581},[571,1058,1059,1061,1064,1066,1068,1070,1073,1075],{"class":573,"line":951},[571,1060,979],{"class":581},[571,1062,1063],{"class":628},"method",[571,1065,985],{"class":581},[571,1067,805],{"class":581},[571,1069,990],{"class":581},[571,1071,1072],{"class":598},"POST",[571,1074,985],{"class":581},[571,1076,998],{"class":581},[571,1078,1080,1082,1084,1086,1088,1090,1093,1095],{"class":573,"line":1079},7,[571,1081,979],{"class":581},[571,1083,812],{"class":628},[571,1085,985],{"class":581},[571,1087,805],{"class":581},[571,1089,990],{"class":581},[571,1091,1092],{"class":598},"\u002Fapi\u002Fcheckout",[571,1094,985],{"class":581},[571,1096,998],{"class":581},[571,1098,1100,1102,1105,1107,1109,1112],{"class":573,"line":1099},8,[571,1101,979],{"class":581},[571,1103,1104],{"class":628},"status",[571,1106,985],{"class":581},[571,1108,805],{"class":581},[571,1110,1111],{"class":922}," 500",[571,1113,998],{"class":581},[571,1115,1117,1119,1122,1124,1126,1128,1131,1133],{"class":573,"line":1116},9,[571,1118,979],{"class":581},[571,1120,1121],{"class":628},"duration",[571,1123,985],{"class":581},[571,1125,805],{"class":581},[571,1127,990],{"class":581},[571,1129,1130],{"class":598},"1.20s",[571,1132,985],{"class":581},[571,1134,998],{"class":581},[571,1136,1138,1140,1143,1145,1147,1149,1152,1154],{"class":573,"line":1137},10,[571,1139,979],{"class":581},[571,1141,1142],{"class":628},"requestId",[571,1144,985],{"class":581},[571,1146,805],{"class":581},[571,1148,990],{"class":581},[571,1150,1151],{"class":598},"4a8ff3a8-...",[571,1153,985],{"class":581},[571,1155,998],{"class":581},[571,1157,1159,1161,1164,1166,1168,1170,1172,1175,1177,1179,1181,1184,1186,1188,1190,1193,1195,1197,1199,1202,1204],{"class":573,"line":1158},11,[571,1160,979],{"class":581},[571,1162,1163],{"class":628},"user",[571,1165,985],{"class":581},[571,1167,805],{"class":581},[571,1169,582],{"class":581},[571,1171,990],{"class":581},[571,1173,1174],{"class":943},"id",[571,1176,985],{"class":581},[571,1178,805],{"class":581},[571,1180,990],{"class":581},[571,1182,1183],{"class":598},"usr_123",[571,1185,985],{"class":581},[571,1187,735],{"class":581},[571,1189,990],{"class":581},[571,1191,1192],{"class":943},"plan",[571,1194,985],{"class":581},[571,1196,805],{"class":581},[571,1198,990],{"class":581},[571,1200,1201],{"class":598},"premium",[571,1203,985],{"class":581},[571,1205,1206],{"class":581}," },\n",[571,1208,1210,1212,1214,1216,1218,1220,1222,1225,1227,1229,1231,1234,1236,1238,1240,1243,1245,1247,1249,1252,1254],{"class":573,"line":1209},12,[571,1211,979],{"class":581},[571,1213,773],{"class":628},[571,1215,985],{"class":581},[571,1217,805],{"class":581},[571,1219,582],{"class":581},[571,1221,990],{"class":581},[571,1223,1224],{"class":943},"name",[571,1226,985],{"class":581},[571,1228,805],{"class":581},[571,1230,990],{"class":581},[571,1232,1233],{"class":598},"PaymentDeclined",[571,1235,985],{"class":581},[571,1237,735],{"class":581},[571,1239,990],{"class":581},[571,1241,1242],{"class":943},"message",[571,1244,985],{"class":581},[571,1246,805],{"class":581},[571,1248,990],{"class":581},[571,1250,1251],{"class":598},"Card declined",[571,1253,985],{"class":581},[571,1255,1256],{"class":581}," }\n",[571,1258,1260],{"class":573,"line":1259},13,[571,1261,1262],{"class":581},"}\n",[536,1264,1265,1266,1269,1270,1273,1274,1277,1278,1281,1282,556],{},"Events emitted outside a request (",[545,1267,1268],{},"log.info({ ... })",", ",[545,1271,1272],{},"createLogger().emit()",") arrive without the HTTP fields, and events from ",[545,1275,1276],{},"log.fork()"," carry ",[545,1279,1280],{},"operation"," and ",[545,1283,1284],{},"_parentRequestId",[670,1286,1289,1290,1294,1295,1298],{"color":1287,"icon":1288},"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 ",[1291,1292,1293],"strong",{},"not"," contained: ",[545,1296,1297],{},"Channel.publish()"," re-raises it as an uncaught exception on the next tick, which is fatal in most apps. Keep subscribers total.",[536,1300,1301,1302,1305],{},"In pretty mode (the dev default), tagged logs like ",[545,1303,1304],{},"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.",[683,1307,285],{"id":1308},"cloudflare-workers",[536,1310,1311,1312,1317,1318,1320],{},"Workers forwards every diagnostics channel message to a ",[539,1313,1316],{"href":1314,"rel":1315},"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 ",[545,1319,676],{},", and their own CPU budget:",[561,1322,1325],{"className":563,"code":1323,"filename":1324,"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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