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traffic:",[613,614,615,628],"table",{},[616,617,618],"thead",{},[619,620,621,625],"tr",{},[622,623,624],"th",{},"Header",[622,626,627],{},"Value",[629,630,631,646],"tbody",{},[619,632,633,640],{},[634,635,636],"td",{},[637,638,639],"code",{},"User-Agent",[634,641,642,645],{},[637,643,644],{},"evlog\u002F\u003Cversion>"," (Node \u002F server runtimes only — browsers strip this header)",[619,647,648,653],{},[634,649,650],{},[637,651,652],{},"X-Evlog-Source",[634,654,655,656,659,660,659,663,659,666,659,669,659,672,659,675,678],{},"The adapter name (",[637,657,658],{},"axiom",", ",[637,661,662],{},"datadog",[637,664,665],{},"otlp",[637,667,668],{},"posthog",[637,670,671],{},"sentry",[637,673,674],{},"better-stack",[637,676,677],{},"client",", …)",[609,680,681,682,685,686,689,690,692],{},"The browser-side ",[637,683,684],{},"evlog\u002Fhttp"," drain (used by client logging) sets ",[637,687,688],{},"X-Evlog-Source: client"," instead, since browsers cannot override ",[637,691,639],{},".",[694,695,697],"h2",{"id":696},"why","Why",[699,700,701,709,718],"ul",{},[702,703,704,708],"li",{},[705,706,707],"strong",{},"Triage at the receiver."," Quickly distinguish evlog traffic from other clients in the receiving system's logs.",[702,710,711,714,715,717],{},[705,712,713],{},"Track adapter usage and version drift."," Roll out a new evlog version and watch the ",[637,716,639],{}," distribution change centrally.",[702,719,720,723,724,726],{},[705,721,722],{},"Debug a specific drain."," Filter by ",[637,725,652],{}," to isolate one adapter's behavior in a sea of incoming requests.",[694,728,730],{"id":729},"reading-the-version","Reading the version",[609,732,733,734,737],{},"Both constants are exported from ",[637,735,736],{},"evlog\u002Ftoolkit"," so your drain (or your receiver) can reference the canonical values:",[739,740,745],"pre",{"className":741,"code":742,"language":743,"meta":744,"style":744},"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","",[637,746,747,785,792,811],{"__ignoreMap":744},[748,749,752,756,760,764,767,770,773,776,779,782],"span",{"class":750,"line":751},"line",1,[748,753,755],{"class":754},"s7zQu","import",[748,757,759],{"class":758},"sMK4o"," {",[748,761,763],{"class":762},"sTEyZ"," EVLOG_USER_AGENT",[748,765,766],{"class":758},",",[748,768,769],{"class":762}," EVLOG_VERSION",[748,771,772],{"class":758}," }",[748,774,775],{"class":754}," from",[748,777,778],{"class":758}," '",[748,780,736],{"class":781},"sfazB",[748,783,784],{"class":758},"'\n",[748,786,788],{"class":750,"line":787},2,[748,789,791],{"emptyLinePlaceholder":790},true,"\n",[748,793,795,798,800,804,807],{"class":750,"line":794},3,[748,796,797],{"class":762},"console",[748,799,692],{"class":758},[748,801,803],{"class":802},"s2Zo4","log",[748,805,806],{"class":762},"(EVLOG_VERSION)    ",[748,808,810],{"class":809},"sHwdD","\u002F\u002F → \"2.16.0\"\n",[748,812,814,816,818,820,823],{"class":750,"line":813},4,[748,815,797],{"class":762},[748,817,692],{"class":758},[748,819,803],{"class":802},[748,821,822],{"class":762},"(EVLOG_USER_AGENT) ",[748,824,825],{"class":809},"\u002F\u002F → \"evlog\u002F2.16.0\"\n",[694,827,829],{"id":828},"overriding-from-a-custom-drain","Overriding from a custom drain",[609,831,832,833,839,840,843,844,847,848,843,850,853],{},"Adapters built with ",[834,835,836],"a",{"href":530},[637,837,838],{},"defineHttpDrain()"," automatically pass the drain ",[637,841,842],{},"name"," as ",[637,845,846],{},"source"," and the canonical ",[637,849,644],{},[637,851,852],{},"userAgent",". You don't need to think about it.",[609,855,856,857,860,861,863,864,866,867,869],{},"When you build a drain on top of ",[637,858,859],{},"httpPost"," from ",[637,862,736],{}," directly (e.g. for a fork with a different identity, or for a vendor that wants its own UA), pass ",[637,865,846],{}," and\u002For ",[637,868,852],{}," to override:",[739,871,873],{"className":741,"code":872,"language":743,"meta":744,"style":744},"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",[637,874,875,894,898,911,931,960,977,991,1008,1027,1047,1056],{"__ignoreMap":744},[748,876,877,879,881,884,886,888,890,892],{"class":750,"line":751},[748,878,755],{"class":754},[748,880,759],{"class":758},[748,882,883],{"class":762}," httpPost",[748,885,772],{"class":758},[748,887,775],{"class":754},[748,889,778],{"class":758},[748,891,736],{"class":781},[748,893,784],{"class":758},[748,895,896],{"class":750,"line":787},[748,897,791],{"emptyLinePlaceholder":790},[748,899,900,903,905,908],{"class":750,"line":794},[748,901,902],{"class":754},"await",[748,904,883],{"class":802},[748,906,907],{"class":762},"(",[748,909,910],{"class":758},"{\n",[748,912,913,917,920,922,925,928],{"class":750,"line":813},[748,914,916],{"class":915},"swJcz","  url",[748,918,919],{"class":758},":",[748,921,778],{"class":758},[748,923,924],{"class":781},"https:\u002F\u002Fmy-platform.example.com\u002Fingest",[748,926,927],{"class":758},"'",[748,929,930],{"class":758},",\n",[748,932,934,937,939,941,943,946,948,950,952,955,957],{"class":750,"line":933},5,[748,935,936],{"class":915},"  headers",[748,938,919],{"class":758},[748,940,759],{"class":758},[748,942,778],{"class":758},[748,944,945],{"class":915},"Content-Type",[748,947,927],{"class":758},[748,949,919],{"class":758},[748,951,778],{"class":758},[748,953,954],{"class":781},"application\u002Fjson",[748,956,927],{"class":758},[748,958,959],{"class":758}," },\n",[748,961,963,966,968,970,973,975],{"class":750,"line":962},6,[748,964,965],{"class":915},"  body",[748,967,919],{"class":758},[748,969,778],{"class":758},[748,971,972],{"class":781},"[]",[748,974,927],{"class":758},[748,976,930],{"class":758},[748,978,980,983,985,989],{"class":750,"line":979},7,[748,981,982],{"class":915},"  timeout",[748,984,919],{"class":758},[748,986,988],{"class":987},"sbssI"," 5000",[748,990,930],{"class":758},[748,992,994,997,999,1001,1004,1006],{"class":750,"line":993},8,[748,995,996],{"class":915},"  label",[748,998,919],{"class":758},[748,1000,778],{"class":758},[748,1002,1003],{"class":781},"my-platform",[748,1005,927],{"class":758},[748,1007,930],{"class":758},[748,1009,1011,1014,1016,1018,1020,1022,1024],{"class":750,"line":1010},9,[748,1012,1013],{"class":915},"  source",[748,1015,919],{"class":758},[748,1017,778],{"class":758},[748,1019,1003],{"class":781},[748,1021,927],{"class":758},[748,1023,766],{"class":758},[748,1025,1026],{"class":809},"           \u002F\u002F sent as X-Evlog-Source\n",[748,1028,1030,1033,1035,1037,1040,1042,1044],{"class":750,"line":1029},10,[748,1031,1032],{"class":915},"  userAgent",[748,1034,919],{"class":758},[748,1036,778],{"class":758},[748,1038,1039],{"class":781},"my-fork\u002F1.0",[748,1041,927],{"class":758},[748,1043,766],{"class":758},[748,1045,1046],{"class":809},"        \u002F\u002F overrides the default User-Agent\n",[748,1048,1050,1053],{"class":750,"line":1049},11,[748,1051,1052],{"class":809},"  \u002F\u002F userAgent: false,",[748,1054,1055],{"class":809},"             \u002F\u002F suppress the header entirely\n",[748,1057,1059,1062],{"class":750,"line":1058},12,[748,1060,1061],{"class":758},"}",[748,1063,1064],{"class":762},")\n",[694,1066,1068],{"id":1067},"next-steps","Next steps",[699,1070,1071,1081],{},[702,1072,1073,1076,1077,1080],{},[834,1074,1075],{"href":530},"Custom Drains",": ",[637,1078,1079],{},"defineHttpDrain"," injects identity headers automatically",[702,1082,1083,1086],{},[834,1084,1085],{"href":535},"Drain Pipeline",": wrap any drain in batch + retry while keeping identity headers",[1088,1089,1090],"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":744,"searchDepth":787,"depth":787,"links":1092},[1093,1094,1095,1096],{"id":696,"depth":787,"text":697},{"id":729,"depth":787,"text":730},{"id":828,"depth":787,"text":829},{"id":1067,"depth":787,"text":1068},"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",[1100],{"label":1075,"icon":532,"to":530,"color":1101,"variant":1102},"neutral","subtle",{},{"title":524,"icon":527},{"title":604,"description":1097},"9-jU3J69nXSua-FxSUy-KREnVDLGGawYYXsbgXPprR4",[1108,1110],{"title":520,"path":521,"stem":522,"description":1109,"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":529,"path":530,"stem":531,"description":1111,"icon":532,"children":-1},"Build a drain for any backend without a built-in adapter. Config resolution, retries, timeouts, and identity headers are handled for you.",1791112794544]