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",[540,594,542],{},".",[597,598,600],"h2",{"id":599},"why","Why",[602,603,604,612,621],"ul",{},[605,606,607,611],"li",{},[608,609,610],"strong",{},"Triage at the receiver."," Quickly distinguish evlog traffic from other clients in the receiving system's logs.",[605,613,614,617,618,620],{},[608,615,616],{},"Track adapter usage and version drift."," Roll out a new evlog version and watch the ",[540,619,542],{}," distribution change centrally.",[605,622,623,626,627,629],{},[608,624,625],{},"Debug a specific drain."," Filter by ",[540,628,555],{}," to isolate one adapter's behavior in a sea of incoming requests.",[597,631,633],{"id":632},"reading-the-version","Reading the version",[512,635,636,637,640],{},"Both constants are exported from ",[540,638,639],{},"evlog\u002Ftoolkit"," so your drain (or your receiver) can reference the canonical values:",[642,643,648],"pre",{"className":644,"code":645,"language":646,"meta":647,"style":647},"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","",[540,649,650,688,695,714],{"__ignoreMap":647},[651,652,655,659,663,667,670,673,676,679,682,685],"span",{"class":653,"line":654},"line",1,[651,656,658],{"class":657},"s7zQu","import",[651,660,662],{"class":661},"sMK4o"," {",[651,664,666],{"class":665},"sTEyZ"," EVLOG_USER_AGENT",[651,668,669],{"class":661},",",[651,671,672],{"class":665}," EVLOG_VERSION",[651,674,675],{"class":661}," }",[651,677,678],{"class":657}," from",[651,680,681],{"class":661}," '",[651,683,639],{"class":684},"sfazB",[651,686,687],{"class":661},"'\n",[651,689,691],{"class":653,"line":690},2,[651,692,694],{"emptyLinePlaceholder":693},true,"\n",[651,696,698,701,703,707,710],{"class":653,"line":697},3,[651,699,700],{"class":665},"console",[651,702,595],{"class":661},[651,704,706],{"class":705},"s2Zo4","log",[651,708,709],{"class":665},"(EVLOG_VERSION)    ",[651,711,713],{"class":712},"sHwdD","\u002F\u002F → \"2.16.0\"\n",[651,715,717,719,721,723,726],{"class":653,"line":716},4,[651,718,700],{"class":665},[651,720,595],{"class":661},[651,722,706],{"class":705},[651,724,725],{"class":665},"(EVLOG_USER_AGENT) ",[651,727,728],{"class":712},"\u002F\u002F → \"evlog\u002F2.16.0\"\n",[597,730,732],{"id":731},"overriding-from-a-custom-drain","Overriding from a custom drain",[512,734,735,736,742,743,746,747,750,751,746,753,756],{},"Adapters built with ",[737,738,739],"a",{"href":467},[540,740,741],{},"defineHttpDrain()"," automatically pass the drain ",[540,744,745],{},"name"," as ",[540,748,749],{},"source"," and the canonical ",[540,752,547],{},[540,754,755],{},"userAgent",". You don't need to think about it.",[512,758,759,760,763,764,766,767,769,770,772],{},"When you build a drain on top of ",[540,761,762],{},"httpPost"," from ",[540,765,639],{}," directly (e.g. for a fork with a different identity, or for a vendor that wants its own UA), pass ",[540,768,749],{}," and\u002For ",[540,771,755],{}," to override:",[642,774,776],{"className":644,"code":775,"language":646,"meta":647,"style":647},"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",[540,777,778,797,801,814,834,863,880,894,911,930,950,959],{"__ignoreMap":647},[651,779,780,782,784,787,789,791,793,795],{"class":653,"line":654},[651,781,658],{"class":657},[651,783,662],{"class":661},[651,785,786],{"class":665}," httpPost",[651,788,675],{"class":661},[651,790,678],{"class":657},[651,792,681],{"class":661},[651,794,639],{"class":684},[651,796,687],{"class":661},[651,798,799],{"class":653,"line":690},[651,800,694],{"emptyLinePlaceholder":693},[651,802,803,806,808,811],{"class":653,"line":697},[651,804,805],{"class":657},"await",[651,807,786],{"class":705},[651,809,810],{"class":665},"(",[651,812,813],{"class":661},"{\n",[651,815,816,820,823,825,828,831],{"class":653,"line":716},[651,817,819],{"class":818},"swJcz","  url",[651,821,822],{"class":661},":",[651,824,681],{"class":661},[651,826,827],{"class":684},"https:\u002F\u002Fmy-platform.example.com\u002Fingest",[651,829,830],{"class":661},"'",[651,832,833],{"class":661},",\n",[651,835,837,840,842,844,846,849,851,853,855,858,860],{"class":653,"line":836},5,[651,838,839],{"class":818},"  headers",[651,841,822],{"class":661},[651,843,662],{"class":661},[651,845,681],{"class":661},[651,847,848],{"class":818},"Content-Type",[651,850,830],{"class":661},[651,852,822],{"class":661},[651,854,681],{"class":661},[651,856,857],{"class":684},"application\u002Fjson",[651,859,830],{"class":661},[651,861,862],{"class":661}," },\n",[651,864,866,869,871,873,876,878],{"class":653,"line":865},6,[651,867,868],{"class":818},"  body",[651,870,822],{"class":661},[651,872,681],{"class":661},[651,874,875],{"class":684},"[]",[651,877,830],{"class":661},[651,879,833],{"class":661},[651,881,883,886,888,892],{"class":653,"line":882},7,[651,884,885],{"class":818},"  timeout",[651,887,822],{"class":661},[651,889,891],{"class":890},"sbssI"," 5000",[651,893,833],{"class":661},[651,895,897,900,902,904,907,909],{"class":653,"line":896},8,[651,898,899],{"class":818},"  label",[651,901,822],{"class":661},[651,903,681],{"class":661},[651,905,906],{"class":684},"my-platform",[651,908,830],{"class":661},[651,910,833],{"class":661},[651,912,914,917,919,921,923,925,927],{"class":653,"line":913},9,[651,915,916],{"class":818},"  source",[651,918,822],{"class":661},[651,920,681],{"class":661},[651,922,906],{"class":684},[651,924,830],{"class":661},[651,926,669],{"class":661},[651,928,929],{"class":712},"           \u002F\u002F sent as X-Evlog-Source\n",[651,931,933,936,938,940,943,945,947],{"class":653,"line":932},10,[651,934,935],{"class":818},"  userAgent",[651,937,822],{"class":661},[651,939,681],{"class":661},[651,941,942],{"class":684},"my-fork\u002F1.0",[651,944,830],{"class":661},[651,946,669],{"class":661},[651,948,949],{"class":712},"        \u002F\u002F overrides the default User-Agent\n",[651,951,953,956],{"class":653,"line":952},11,[651,954,955],{"class":712},"  \u002F\u002F userAgent: false,",[651,957,958],{"class":712},"             \u002F\u002F suppress the header entirely\n",[651,960,962,965],{"class":653,"line":961},12,[651,963,964],{"class":661},"}",[651,966,967],{"class":665},")\n",[597,969,971],{"id":970},"next-steps","Next steps",[602,973,974,984],{},[605,975,976,979,980,983],{},[737,977,978],{"href":467},"Custom Drains"," — ",[540,981,982],{},"defineHttpDrain"," injects identity headers automatically",[605,985,986,989],{},[737,987,988],{"href":472},"Drain Pipeline"," — wrap any drain in batch + retry while keeping identity headers",[991,992,993],"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":647,"searchDepth":690,"depth":690,"links":995},[996,997,998,999],{"id":599,"depth":690,"text":600},{"id":632,"depth":690,"text":633},{"id":731,"depth":690,"text":732},{"id":970,"depth":690,"text":971},"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",[1003],{"label":978,"icon":469,"to":467,"color":1004,"variant":1005},"neutral","subtle",{},{"title":461,"icon":464},{"title":507,"description":1000},"gfvY7aCTYjht3OcMEXXfgha2PlhYsOnqpwm73GY9l_s",[1011,1013],{"title":457,"path":458,"stem":459,"description":1012,"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":466,"path":467,"stem":468,"description":1014,"icon":469,"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.",1785230296488]