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OpenTelemetry","\u002Fcompare\u002Fopentelemetry","8.compare\u002F2.opentelemetry",{"title":596,"path":597,"stem":598,"icon":572},"evlog vs LogTape","\u002Fcompare\u002Flogtape","8.compare\u002F3.logtape",{"title":600,"path":601,"stem":602,"icon":572},"evlog vs Winston: formats and request events","\u002Fcompare\u002Fwinston","8.compare\u002F4.winston",{"title":604,"path":605,"stem":606,"icon":572},"evlog vs Consola: reporters and request context","\u002Fcompare\u002Fconsola","8.compare\u002F5.consola",{"id":608,"title":609,"body":610,"description":1102,"extension":1103,"links":1104,"meta":1108,"navigation":1109,"path":530,"seo":1110,"stem":531,"__hash__":1111},"docs\u002F6.extend\u002F7.identity-headers.md","Identity Headers",{"type":611,"value":612,"toc":1096},"minimark",[613,617,684,698,703,732,736,743,831,835,859,875,1070,1074,1092],[614,615,616],"p",{},"Every drain request sent by evlog is tagged with two identity headers so receivers can identify the traffic:",[618,619,620,633],"table",{},[621,622,623],"thead",{},[624,625,626,630],"tr",{},[627,628,629],"th",{},"Header",[627,631,632],{},"Value",[634,635,636,651],"tbody",{},[624,637,638,645],{},[639,640,641],"td",{},[642,643,644],"code",{},"User-Agent",[639,646,647,650],{},[642,648,649],{},"evlog\u002F\u003Cversion>"," (Node \u002F server runtimes only — browsers strip this header)",[624,652,653,658],{},[639,654,655],{},[642,656,657],{},"X-Evlog-Source",[639,659,660,661,664,665,664,668,664,671,664,674,664,677,664,680,683],{},"The adapter name (",[642,662,663],{},"axiom",", ",[642,666,667],{},"datadog",[642,669,670],{},"otlp",[642,672,673],{},"posthog",[642,675,676],{},"sentry",[642,678,679],{},"better-stack",[642,681,682],{},"client",", …)",[614,685,686,687,690,691,694,695,697],{},"The browser-side ",[642,688,689],{},"evlog\u002Fhttp"," drain (used by client logging) sets ",[642,692,693],{},"X-Evlog-Source: client"," instead, since browsers cannot override ",[642,696,644],{},".",[699,700,702],"h2",{"id":701},"why","Why",[704,705,706,714,723],"ul",{},[707,708,709,713],"li",{},[710,711,712],"strong",{},"Triage at the receiver."," Quickly distinguish evlog traffic from other clients in the receiving system's logs.",[707,715,716,719,720,722],{},[710,717,718],{},"Track adapter usage and version drift."," Roll out a new evlog version and watch the ",[642,721,644],{}," distribution change centrally.",[707,724,725,728,729,731],{},[710,726,727],{},"Debug a specific drain."," Filter by ",[642,730,657],{}," to isolate one adapter's behavior in a sea of incoming requests.",[699,733,735],{"id":734},"reading-the-version","Reading the version",[614,737,738,739,742],{},"Both constants are exported from ",[642,740,741],{},"evlog\u002Ftoolkit"," so your drain (or your receiver) can reference the canonical values:",[744,745,750],"pre",{"className":746,"code":747,"language":748,"meta":749,"style":749},"language-ts shiki shiki-themes material-theme-lighter material-theme material-theme-palenight","import { EVLOG_USER_AGENT, EVLOG_VERSION } from 'evlog\u002Ftoolkit'\n\nconsole.log(EVLOG_VERSION)    \u002F\u002F → \"2.16.0\"\nconsole.log(EVLOG_USER_AGENT) \u002F\u002F → \"evlog\u002F2.16.0\"\n","ts","",[642,751,752,790,797,816],{"__ignoreMap":749},[753,754,757,761,765,769,772,775,778,781,784,787],"span",{"class":755,"line":756},"line",1,[753,758,760],{"class":759},"s7zQu","import",[753,762,764],{"class":763},"sMK4o"," {",[753,766,768],{"class":767},"sTEyZ"," EVLOG_USER_AGENT",[753,770,771],{"class":763},",",[753,773,774],{"class":767}," EVLOG_VERSION",[753,776,777],{"class":763}," }",[753,779,780],{"class":759}," from",[753,782,783],{"class":763}," '",[753,785,741],{"class":786},"sfazB",[753,788,789],{"class":763},"'\n",[753,791,793],{"class":755,"line":792},2,[753,794,796],{"emptyLinePlaceholder":795},true,"\n",[753,798,800,803,805,809,812],{"class":755,"line":799},3,[753,801,802],{"class":767},"console",[753,804,697],{"class":763},[753,806,808],{"class":807},"s2Zo4","log",[753,810,811],{"class":767},"(EVLOG_VERSION)    ",[753,813,815],{"class":814},"sHwdD","\u002F\u002F → \"2.16.0\"\n",[753,817,819,821,823,825,828],{"class":755,"line":818},4,[753,820,802],{"class":767},[753,822,697],{"class":763},[753,824,808],{"class":807},[753,826,827],{"class":767},"(EVLOG_USER_AGENT) ",[753,829,830],{"class":814},"\u002F\u002F → \"evlog\u002F2.16.0\"\n",[699,832,834],{"id":833},"overriding-from-a-custom-drain","Overriding from a custom drain",[614,836,837,838,844,845,848,849,852,853,848,855,858],{},"Adapters built with ",[839,840,841],"a",{"href":535},[642,842,843],{},"defineHttpDrain()"," automatically pass the drain ",[642,846,847],{},"name"," as ",[642,850,851],{},"source"," and the canonical ",[642,854,649],{},[642,856,857],{},"userAgent",". You don't need to think about it.",[614,860,861,862,865,866,868,869,871,872,874],{},"When you build a drain on top of ",[642,863,864],{},"httpPost"," from ",[642,867,741],{}," directly (e.g. for a fork with a different identity, or for a vendor that wants its own UA), pass ",[642,870,851],{}," and\u002For ",[642,873,857],{}," to override:",[744,876,878],{"className":746,"code":877,"language":748,"meta":749,"style":749},"import { httpPost } from 'evlog\u002Ftoolkit'\n\nawait httpPost({\n  url: 'https:\u002F\u002Fmy-platform.example.com\u002Fingest',\n  headers: { 'Content-Type': 'application\u002Fjson' },\n  body: '[]',\n  timeout: 5000,\n  label: 'my-platform',\n  source: 'my-platform',           \u002F\u002F sent as X-Evlog-Source\n  userAgent: 'my-fork\u002F1.0',        \u002F\u002F overrides the default User-Agent\n  \u002F\u002F userAgent: false,             \u002F\u002F suppress the header entirely\n})\n",[642,879,880,899,903,916,936,965,982,996,1013,1032,1052,1061],{"__ignoreMap":749},[753,881,882,884,886,889,891,893,895,897],{"class":755,"line":756},[753,883,760],{"class":759},[753,885,764],{"class":763},[753,887,888],{"class":767}," httpPost",[753,890,777],{"class":763},[753,892,780],{"class":759},[753,894,783],{"class":763},[753,896,741],{"class":786},[753,898,789],{"class":763},[753,900,901],{"class":755,"line":792},[753,902,796],{"emptyLinePlaceholder":795},[753,904,905,908,910,913],{"class":755,"line":799},[753,906,907],{"class":759},"await",[753,909,888],{"class":807},[753,911,912],{"class":767},"(",[753,914,915],{"class":763},"{\n",[753,917,918,922,925,927,930,933],{"class":755,"line":818},[753,919,921],{"class":920},"swJcz","  url",[753,923,924],{"class":763},":",[753,926,783],{"class":763},[753,928,929],{"class":786},"https:\u002F\u002Fmy-platform.example.com\u002Fingest",[753,931,932],{"class":763},"'",[753,934,935],{"class":763},",\n",[753,937,939,942,944,946,948,951,953,955,957,960,962],{"class":755,"line":938},5,[753,940,941],{"class":920},"  headers",[753,943,924],{"class":763},[753,945,764],{"class":763},[753,947,783],{"class":763},[753,949,950],{"class":920},"Content-Type",[753,952,932],{"class":763},[753,954,924],{"class":763},[753,956,783],{"class":763},[753,958,959],{"class":786},"application\u002Fjson",[753,961,932],{"class":763},[753,963,964],{"class":763}," },\n",[753,966,968,971,973,975,978,980],{"class":755,"line":967},6,[753,969,970],{"class":920},"  body",[753,972,924],{"class":763},[753,974,783],{"class":763},[753,976,977],{"class":786},"[]",[753,979,932],{"class":763},[753,981,935],{"class":763},[753,983,985,988,990,994],{"class":755,"line":984},7,[753,986,987],{"class":920},"  timeout",[753,989,924],{"class":763},[753,991,993],{"class":992},"sbssI"," 5000",[753,995,935],{"class":763},[753,997,999,1002,1004,1006,1009,1011],{"class":755,"line":998},8,[753,1000,1001],{"class":920},"  label",[753,1003,924],{"class":763},[753,1005,783],{"class":763},[753,1007,1008],{"class":786},"my-platform",[753,1010,932],{"class":763},[753,1012,935],{"class":763},[753,1014,1016,1019,1021,1023,1025,1027,1029],{"class":755,"line":1015},9,[753,1017,1018],{"class":920},"  source",[753,1020,924],{"class":763},[753,1022,783],{"class":763},[753,1024,1008],{"class":786},[753,1026,932],{"class":763},[753,1028,771],{"class":763},[753,1030,1031],{"class":814},"           \u002F\u002F sent as X-Evlog-Source\n",[753,1033,1035,1038,1040,1042,1045,1047,1049],{"class":755,"line":1034},10,[753,1036,1037],{"class":920},"  userAgent",[753,1039,924],{"class":763},[753,1041,783],{"class":763},[753,1043,1044],{"class":786},"my-fork\u002F1.0",[753,1046,932],{"class":763},[753,1048,771],{"class":763},[753,1050,1051],{"class":814},"        \u002F\u002F overrides the default User-Agent\n",[753,1053,1055,1058],{"class":755,"line":1054},11,[753,1056,1057],{"class":814},"  \u002F\u002F userAgent: false,",[753,1059,1060],{"class":814},"             \u002F\u002F suppress the header entirely\n",[753,1062,1064,1067],{"class":755,"line":1063},12,[753,1065,1066],{"class":763},"}",[753,1068,1069],{"class":767},")\n",[699,1071,1073],{"id":1072},"next-steps","Next steps",[704,1075,1076,1086],{},[707,1077,1078,1081,1082,1085],{},[839,1079,1080],{"href":535},"Custom Drains",": ",[642,1083,1084],{},"defineHttpDrain"," injects identity headers automatically",[707,1087,1088,1091],{},[839,1089,1090],{"href":540},"Drain Pipeline",": wrap any drain in batch + retry while keeping identity headers",[1093,1094,1095],"style",{},"html pre.shiki code .s7zQu, html code.shiki .s7zQu{--shiki-light:#39ADB5;--shiki-light-font-style:italic;--shiki-default:#89DDFF;--shiki-default-font-style:italic;--shiki-dark:#89DDFF;--shiki-dark-font-style:italic}html pre.shiki code .sMK4o, html code.shiki .sMK4o{--shiki-light:#39ADB5;--shiki-default:#89DDFF;--shiki-dark:#89DDFF}html pre.shiki code .sTEyZ, html code.shiki .sTEyZ{--shiki-light:#90A4AE;--shiki-default:#EEFFFF;--shiki-dark:#BABED8}html pre.shiki code .sfazB, html code.shiki .sfazB{--shiki-light:#91B859;--shiki-default:#C3E88D;--shiki-dark:#C3E88D}html pre.shiki code .s2Zo4, html code.shiki .s2Zo4{--shiki-light:#6182B8;--shiki-default:#82AAFF;--shiki-dark:#82AAFF}html pre.shiki code .sHwdD, html code.shiki .sHwdD{--shiki-light:#90A4AE;--shiki-light-font-style:italic;--shiki-default:#546E7A;--shiki-default-font-style:italic;--shiki-dark:#676E95;--shiki-dark-font-style:italic}html .light .shiki span {color: var(--shiki-light);background: var(--shiki-light-bg);font-style: var(--shiki-light-font-style);font-weight: var(--shiki-light-font-weight);text-decoration: var(--shiki-light-text-decoration);}html.light .shiki span {color: var(--shiki-light);background: var(--shiki-light-bg);font-style: var(--shiki-light-font-style);font-weight: var(--shiki-light-font-weight);text-decoration: var(--shiki-light-text-decoration);}html .default .shiki span {color: var(--shiki-default);background: var(--shiki-default-bg);font-style: var(--shiki-default-font-style);font-weight: var(--shiki-default-font-weight);text-decoration: var(--shiki-default-text-decoration);}html .shiki span {color: var(--shiki-default);background: var(--shiki-default-bg);font-style: var(--shiki-default-font-style);font-weight: var(--shiki-default-font-weight);text-decoration: var(--shiki-default-text-decoration);}html .dark .shiki span {color: var(--shiki-dark);background: var(--shiki-dark-bg);font-style: var(--shiki-dark-font-style);font-weight: var(--shiki-dark-font-weight);text-decoration: var(--shiki-dark-text-decoration);}html.dark .shiki span {color: var(--shiki-dark);background: var(--shiki-dark-bg);font-style: var(--shiki-dark-font-style);font-weight: var(--shiki-dark-font-weight);text-decoration: var(--shiki-dark-text-decoration);}html pre.shiki code .swJcz, html code.shiki .swJcz{--shiki-light:#E53935;--shiki-default:#F07178;--shiki-dark:#F07178}html pre.shiki code .sbssI, html code.shiki .sbssI{--shiki-light:#F76D47;--shiki-default:#F78C6C;--shiki-dark:#F78C6C}",{"title":749,"searchDepth":792,"depth":792,"links":1097},[1098,1099,1100,1101],{"id":701,"depth":792,"text":702},{"id":734,"depth":792,"text":735},{"id":833,"depth":792,"text":834},{"id":1072,"depth":792,"text":1073},"Every drain request carries User-Agent and X-Evlog-Source so receivers can triage the traffic. Override or suppress them when you need to.","md",[1105],{"label":1080,"icon":537,"to":535,"color":1106,"variant":1107},"neutral","subtle",{},{"title":529,"icon":532},{"title":609,"description":1102},"9-jU3J69nXSua-FxSUy-KREnVDLGGawYYXsbgXPprR4",[1113,1115],{"title":525,"path":526,"stem":527,"description":1114,"icon":69,"children":-1},"Decide after the fact whether to keep an event, knowing its status, duration, and errors. Keep every error, throw away healthy noise.",{"title":534,"path":535,"stem":536,"description":1116,"icon":537,"children":-1},"Build a drain for any backend without a built-in adapter. Config resolution, retries, timeouts, and identity headers are handled for you.",1791230910843]