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",[550,604,552],{},".",[607,608,610],"h2",{"id":609},"why","Why",[612,613,614,622,631],"ul",{},[615,616,617,621],"li",{},[618,619,620],"strong",{},"Triage at the receiver."," Quickly distinguish evlog traffic from other clients in the receiving system's logs.",[615,623,624,627,628,630],{},[618,625,626],{},"Track adapter usage and version drift."," Roll out a new evlog version and watch the ",[550,629,552],{}," distribution change centrally.",[615,632,633,636,637,639],{},[618,634,635],{},"Debug a specific drain."," Filter by ",[550,638,565],{}," to isolate one adapter's behavior in a sea of incoming requests.",[607,641,643],{"id":642},"reading-the-version","Reading the version",[522,645,646,647,650],{},"Both constants are exported from ",[550,648,649],{},"evlog\u002Ftoolkit"," so your drain (or your receiver) can reference the canonical values:",[652,653,658],"pre",{"className":654,"code":655,"language":656,"meta":657,"style":657},"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","",[550,659,660,698,705,724],{"__ignoreMap":657},[661,662,665,669,673,677,680,683,686,689,692,695],"span",{"class":663,"line":664},"line",1,[661,666,668],{"class":667},"s7zQu","import",[661,670,672],{"class":671},"sMK4o"," {",[661,674,676],{"class":675},"sTEyZ"," EVLOG_USER_AGENT",[661,678,679],{"class":671},",",[661,681,682],{"class":675}," EVLOG_VERSION",[661,684,685],{"class":671}," }",[661,687,688],{"class":667}," from",[661,690,691],{"class":671}," '",[661,693,649],{"class":694},"sfazB",[661,696,697],{"class":671},"'\n",[661,699,701],{"class":663,"line":700},2,[661,702,704],{"emptyLinePlaceholder":703},true,"\n",[661,706,708,711,713,717,720],{"class":663,"line":707},3,[661,709,710],{"class":675},"console",[661,712,605],{"class":671},[661,714,716],{"class":715},"s2Zo4","log",[661,718,719],{"class":675},"(EVLOG_VERSION)    ",[661,721,723],{"class":722},"sHwdD","\u002F\u002F → \"2.16.0\"\n",[661,725,727,729,731,733,736],{"class":663,"line":726},4,[661,728,710],{"class":675},[661,730,605],{"class":671},[661,732,716],{"class":715},[661,734,735],{"class":675},"(EVLOG_USER_AGENT) ",[661,737,738],{"class":722},"\u002F\u002F → \"evlog\u002F2.16.0\"\n",[607,740,742],{"id":741},"overriding-from-a-custom-drain","Overriding from a custom drain",[522,744,745,746,752,753,756,757,760,761,756,763,766],{},"Adapters built with ",[747,748,749],"a",{"href":477},[550,750,751],{},"defineHttpDrain()"," automatically pass the drain ",[550,754,755],{},"name"," as ",[550,758,759],{},"source"," and the canonical ",[550,762,557],{},[550,764,765],{},"userAgent",". You don't need to think about it.",[522,768,769,770,773,774,776,777,779,780,782],{},"When you build a drain on top of ",[550,771,772],{},"httpPost"," from ",[550,775,649],{}," directly (e.g. for a fork with a different identity, or for a vendor that wants its own UA), pass ",[550,778,759],{}," and\u002For ",[550,781,765],{}," to override:",[652,784,786],{"className":654,"code":785,"language":656,"meta":657,"style":657},"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",[550,787,788,807,811,824,844,873,890,904,921,940,960,969],{"__ignoreMap":657},[661,789,790,792,794,797,799,801,803,805],{"class":663,"line":664},[661,791,668],{"class":667},[661,793,672],{"class":671},[661,795,796],{"class":675}," httpPost",[661,798,685],{"class":671},[661,800,688],{"class":667},[661,802,691],{"class":671},[661,804,649],{"class":694},[661,806,697],{"class":671},[661,808,809],{"class":663,"line":700},[661,810,704],{"emptyLinePlaceholder":703},[661,812,813,816,818,821],{"class":663,"line":707},[661,814,815],{"class":667},"await",[661,817,796],{"class":715},[661,819,820],{"class":675},"(",[661,822,823],{"class":671},"{\n",[661,825,826,830,833,835,838,841],{"class":663,"line":726},[661,827,829],{"class":828},"swJcz","  url",[661,831,832],{"class":671},":",[661,834,691],{"class":671},[661,836,837],{"class":694},"https:\u002F\u002Fmy-platform.example.com\u002Fingest",[661,839,840],{"class":671},"'",[661,842,843],{"class":671},",\n",[661,845,847,850,852,854,856,859,861,863,865,868,870],{"class":663,"line":846},5,[661,848,849],{"class":828},"  headers",[661,851,832],{"class":671},[661,853,672],{"class":671},[661,855,691],{"class":671},[661,857,858],{"class":828},"Content-Type",[661,860,840],{"class":671},[661,862,832],{"class":671},[661,864,691],{"class":671},[661,866,867],{"class":694},"application\u002Fjson",[661,869,840],{"class":671},[661,871,872],{"class":671}," },\n",[661,874,876,879,881,883,886,888],{"class":663,"line":875},6,[661,877,878],{"class":828},"  body",[661,880,832],{"class":671},[661,882,691],{"class":671},[661,884,885],{"class":694},"[]",[661,887,840],{"class":671},[661,889,843],{"class":671},[661,891,893,896,898,902],{"class":663,"line":892},7,[661,894,895],{"class":828},"  timeout",[661,897,832],{"class":671},[661,899,901],{"class":900},"sbssI"," 5000",[661,903,843],{"class":671},[661,905,907,910,912,914,917,919],{"class":663,"line":906},8,[661,908,909],{"class":828},"  label",[661,911,832],{"class":671},[661,913,691],{"class":671},[661,915,916],{"class":694},"my-platform",[661,918,840],{"class":671},[661,920,843],{"class":671},[661,922,924,927,929,931,933,935,937],{"class":663,"line":923},9,[661,925,926],{"class":828},"  source",[661,928,832],{"class":671},[661,930,691],{"class":671},[661,932,916],{"class":694},[661,934,840],{"class":671},[661,936,679],{"class":671},[661,938,939],{"class":722},"           \u002F\u002F sent as X-Evlog-Source\n",[661,941,943,946,948,950,953,955,957],{"class":663,"line":942},10,[661,944,945],{"class":828},"  userAgent",[661,947,832],{"class":671},[661,949,691],{"class":671},[661,951,952],{"class":694},"my-fork\u002F1.0",[661,954,840],{"class":671},[661,956,679],{"class":671},[661,958,959],{"class":722},"        \u002F\u002F overrides the default User-Agent\n",[661,961,963,966],{"class":663,"line":962},11,[661,964,965],{"class":722},"  \u002F\u002F userAgent: false,",[661,967,968],{"class":722},"             \u002F\u002F suppress the header entirely\n",[661,970,972,975],{"class":663,"line":971},12,[661,973,974],{"class":671},"}",[661,976,977],{"class":675},")\n",[607,979,981],{"id":980},"next-steps","Next steps",[612,983,984,994],{},[615,985,986,989,990,993],{},[747,987,988],{"href":477},"Custom Drains"," — ",[550,991,992],{},"defineHttpDrain"," injects identity headers automatically",[615,995,996,999],{},[747,997,998],{"href":482},"Drain Pipeline"," — wrap any drain in batch + retry while keeping identity headers",[1001,1002,1003],"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":657,"searchDepth":700,"depth":700,"links":1005},[1006,1007,1008,1009],{"id":609,"depth":700,"text":610},{"id":642,"depth":700,"text":643},{"id":741,"depth":700,"text":742},{"id":980,"depth":700,"text":981},"Every drain request sent by evlog is tagged with User-Agent and X-Evlog-Source headers so receivers can identify and triage the traffic. Override or suppress them when your custom drain needs different identity.","md",[1013],{"label":988,"icon":479,"to":477,"color":1014,"variant":1015},"neutral","subtle",{},{"title":471,"icon":474},{"title":517,"description":1010},"gfvY7aCTYjht3OcMEXXfgha2PlhYsOnqpwm73GY9l_s",[1021,1023],{"title":467,"path":468,"stem":469,"description":1022,"icon":64,"children":-1},"Decide post-hoc whether to keep an event with full knowledge of its outcome (status, duration, errors). The opposite of head sampling — keep all errors and slow requests while throwing away healthy noise.",{"title":476,"path":477,"stem":478,"description":1024,"icon":479,"children":-1},"Build a drain for any backend without a built-in adapter — defineHttpDrain for HTTP destinations, defineDrain for any other transport. Standardized config resolution, retries, timeouts, and identity headers handled for you.",1785610620567]