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traffic:",[609,610,611,624],"table",{},[612,613,614],"thead",{},[615,616,617,621],"tr",{},[618,619,620],"th",{},"Header",[618,622,623],{},"Value",[625,626,627,642],"tbody",{},[615,628,629,636],{},[630,631,632],"td",{},[633,634,635],"code",{},"User-Agent",[630,637,638,641],{},[633,639,640],{},"evlog\u002F\u003Cversion>"," (Node \u002F server runtimes only — browsers strip this header)",[615,643,644,649],{},[630,645,646],{},[633,647,648],{},"X-Evlog-Source",[630,650,651,652,655,656,655,659,655,662,655,665,655,668,655,671,674],{},"The adapter name (",[633,653,654],{},"axiom",", ",[633,657,658],{},"datadog",[633,660,661],{},"otlp",[633,663,664],{},"posthog",[633,666,667],{},"sentry",[633,669,670],{},"better-stack",[633,672,673],{},"client",", …)",[605,676,677,678,681,682,685,686,688],{},"The browser-side ",[633,679,680],{},"evlog\u002Fhttp"," drain (used by client logging) sets ",[633,683,684],{},"X-Evlog-Source: client"," instead, since browsers cannot override ",[633,687,635],{},".",[690,691,693],"h2",{"id":692},"why","Why",[695,696,697,705,714],"ul",{},[698,699,700,704],"li",{},[701,702,703],"strong",{},"Triage at the receiver."," Quickly distinguish evlog traffic from other clients in the receiving system's logs.",[698,706,707,710,711,713],{},[701,708,709],{},"Track adapter usage and version drift."," Roll out a new evlog version and watch the ",[633,712,635],{}," distribution change centrally.",[698,715,716,719,720,722],{},[701,717,718],{},"Debug a specific drain."," Filter by ",[633,721,648],{}," to isolate one adapter's behavior in a sea of incoming requests.",[690,724,726],{"id":725},"reading-the-version","Reading the version",[605,728,729,730,733],{},"Both constants are exported from ",[633,731,732],{},"evlog\u002Ftoolkit"," so your drain (or your receiver) can reference the canonical values:",[735,736,741],"pre",{"className":737,"code":738,"language":739,"meta":740,"style":740},"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","",[633,742,743,781,788,807],{"__ignoreMap":740},[744,745,748,752,756,760,763,766,769,772,775,778],"span",{"class":746,"line":747},"line",1,[744,749,751],{"class":750},"s7zQu","import",[744,753,755],{"class":754},"sMK4o"," {",[744,757,759],{"class":758},"sTEyZ"," EVLOG_USER_AGENT",[744,761,762],{"class":754},",",[744,764,765],{"class":758}," EVLOG_VERSION",[744,767,768],{"class":754}," }",[744,770,771],{"class":750}," from",[744,773,774],{"class":754}," '",[744,776,732],{"class":777},"sfazB",[744,779,780],{"class":754},"'\n",[744,782,784],{"class":746,"line":783},2,[744,785,787],{"emptyLinePlaceholder":786},true,"\n",[744,789,791,794,796,800,803],{"class":746,"line":790},3,[744,792,793],{"class":758},"console",[744,795,688],{"class":754},[744,797,799],{"class":798},"s2Zo4","log",[744,801,802],{"class":758},"(EVLOG_VERSION)    ",[744,804,806],{"class":805},"sHwdD","\u002F\u002F → \"2.16.0\"\n",[744,808,810,812,814,816,819],{"class":746,"line":809},4,[744,811,793],{"class":758},[744,813,688],{"class":754},[744,815,799],{"class":798},[744,817,818],{"class":758},"(EVLOG_USER_AGENT) ",[744,820,821],{"class":805},"\u002F\u002F → \"evlog\u002F2.16.0\"\n",[690,823,825],{"id":824},"overriding-from-a-custom-drain","Overriding from a custom drain",[605,827,828,829,835,836,839,840,843,844,839,846,849],{},"Adapters built with ",[830,831,832],"a",{"href":526},[633,833,834],{},"defineHttpDrain()"," automatically pass the drain ",[633,837,838],{},"name"," as ",[633,841,842],{},"source"," and the canonical ",[633,845,640],{},[633,847,848],{},"userAgent",". You don't need to think about it.",[605,851,852,853,856,857,859,860,862,863,865],{},"When you build a drain on top of ",[633,854,855],{},"httpPost"," from ",[633,858,732],{}," directly (e.g. for a fork with a different identity, or for a vendor that wants its own UA), pass ",[633,861,842],{}," and\u002For ",[633,864,848],{}," to override:",[735,867,869],{"className":737,"code":868,"language":739,"meta":740,"style":740},"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",[633,870,871,890,894,907,927,956,973,987,1004,1023,1043,1052],{"__ignoreMap":740},[744,872,873,875,877,880,882,884,886,888],{"class":746,"line":747},[744,874,751],{"class":750},[744,876,755],{"class":754},[744,878,879],{"class":758}," httpPost",[744,881,768],{"class":754},[744,883,771],{"class":750},[744,885,774],{"class":754},[744,887,732],{"class":777},[744,889,780],{"class":754},[744,891,892],{"class":746,"line":783},[744,893,787],{"emptyLinePlaceholder":786},[744,895,896,899,901,904],{"class":746,"line":790},[744,897,898],{"class":750},"await",[744,900,879],{"class":798},[744,902,903],{"class":758},"(",[744,905,906],{"class":754},"{\n",[744,908,909,913,916,918,921,924],{"class":746,"line":809},[744,910,912],{"class":911},"swJcz","  url",[744,914,915],{"class":754},":",[744,917,774],{"class":754},[744,919,920],{"class":777},"https:\u002F\u002Fmy-platform.example.com\u002Fingest",[744,922,923],{"class":754},"'",[744,925,926],{"class":754},",\n",[744,928,930,933,935,937,939,942,944,946,948,951,953],{"class":746,"line":929},5,[744,931,932],{"class":911},"  headers",[744,934,915],{"class":754},[744,936,755],{"class":754},[744,938,774],{"class":754},[744,940,941],{"class":911},"Content-Type",[744,943,923],{"class":754},[744,945,915],{"class":754},[744,947,774],{"class":754},[744,949,950],{"class":777},"application\u002Fjson",[744,952,923],{"class":754},[744,954,955],{"class":754}," },\n",[744,957,959,962,964,966,969,971],{"class":746,"line":958},6,[744,960,961],{"class":911},"  body",[744,963,915],{"class":754},[744,965,774],{"class":754},[744,967,968],{"class":777},"[]",[744,970,923],{"class":754},[744,972,926],{"class":754},[744,974,976,979,981,985],{"class":746,"line":975},7,[744,977,978],{"class":911},"  timeout",[744,980,915],{"class":754},[744,982,984],{"class":983},"sbssI"," 5000",[744,986,926],{"class":754},[744,988,990,993,995,997,1000,1002],{"class":746,"line":989},8,[744,991,992],{"class":911},"  label",[744,994,915],{"class":754},[744,996,774],{"class":754},[744,998,999],{"class":777},"my-platform",[744,1001,923],{"class":754},[744,1003,926],{"class":754},[744,1005,1007,1010,1012,1014,1016,1018,1020],{"class":746,"line":1006},9,[744,1008,1009],{"class":911},"  source",[744,1011,915],{"class":754},[744,1013,774],{"class":754},[744,1015,999],{"class":777},[744,1017,923],{"class":754},[744,1019,762],{"class":754},[744,1021,1022],{"class":805},"           \u002F\u002F sent as X-Evlog-Source\n",[744,1024,1026,1029,1031,1033,1036,1038,1040],{"class":746,"line":1025},10,[744,1027,1028],{"class":911},"  userAgent",[744,1030,915],{"class":754},[744,1032,774],{"class":754},[744,1034,1035],{"class":777},"my-fork\u002F1.0",[744,1037,923],{"class":754},[744,1039,762],{"class":754},[744,1041,1042],{"class":805},"        \u002F\u002F overrides the default User-Agent\n",[744,1044,1046,1049],{"class":746,"line":1045},11,[744,1047,1048],{"class":805},"  \u002F\u002F userAgent: false,",[744,1050,1051],{"class":805},"             \u002F\u002F suppress the header entirely\n",[744,1053,1055,1058],{"class":746,"line":1054},12,[744,1056,1057],{"class":754},"}",[744,1059,1060],{"class":758},")\n",[690,1062,1064],{"id":1063},"next-steps","Next steps",[695,1066,1067,1077],{},[698,1068,1069,1072,1073,1076],{},[830,1070,1071],{"href":526},"Custom Drains",": ",[633,1074,1075],{},"defineHttpDrain"," injects identity headers automatically",[698,1078,1079,1082],{},[830,1080,1081],{"href":531},"Drain Pipeline",": wrap any drain in batch + retry while keeping identity headers",[1084,1085,1086],"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":740,"searchDepth":783,"depth":783,"links":1088},[1089,1090,1091,1092],{"id":692,"depth":783,"text":693},{"id":725,"depth":783,"text":726},{"id":824,"depth":783,"text":825},{"id":1063,"depth":783,"text":1064},"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",[1096],{"label":1071,"icon":528,"to":526,"color":1097,"variant":1098},"neutral","subtle",{},{"title":520,"icon":523},{"title":600,"description":1093},"VHR_rh03hC4aVSKeQNRth7T1MV4dt4mEZ6J-K3NJvgc",[1104,1106],{"title":516,"path":517,"stem":518,"description":1105,"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":525,"path":526,"stem":527,"description":1107,"icon":528,"children":-1},"Build a drain for any backend without a built-in adapter. Config resolution, retries, timeouts, and identity headers are handled for you.",1789076919061]