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",[535,589,537],{},".",[592,593,595],"h2",{"id":594},"why","Why",[597,598,599,607,616],"ul",{},[600,601,602,606],"li",{},[603,604,605],"strong",{},"Triage at the receiver."," Quickly distinguish evlog traffic from other clients in the receiving system's logs.",[600,608,609,612,613,615],{},[603,610,611],{},"Track adapter usage and version drift."," Roll out a new evlog version and watch the ",[535,614,537],{}," distribution change centrally.",[600,617,618,621,622,624],{},[603,619,620],{},"Debug a specific drain."," Filter by ",[535,623,550],{}," to isolate one adapter's behavior in a sea of incoming requests.",[592,626,628],{"id":627},"reading-the-version","Reading the version",[507,630,631,632,635],{},"Both constants are exported from ",[535,633,634],{},"evlog\u002Ftoolkit"," so your drain (or your receiver) can reference the canonical values:",[637,638,643],"pre",{"className":639,"code":640,"language":641,"meta":642,"style":642},"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","",[535,644,645,683,690,709],{"__ignoreMap":642},[646,647,650,654,658,662,665,668,671,674,677,680],"span",{"class":648,"line":649},"line",1,[646,651,653],{"class":652},"s7zQu","import",[646,655,657],{"class":656},"sMK4o"," {",[646,659,661],{"class":660},"sTEyZ"," EVLOG_USER_AGENT",[646,663,664],{"class":656},",",[646,666,667],{"class":660}," EVLOG_VERSION",[646,669,670],{"class":656}," }",[646,672,673],{"class":652}," from",[646,675,676],{"class":656}," '",[646,678,634],{"class":679},"sfazB",[646,681,682],{"class":656},"'\n",[646,684,686],{"class":648,"line":685},2,[646,687,689],{"emptyLinePlaceholder":688},true,"\n",[646,691,693,696,698,702,705],{"class":648,"line":692},3,[646,694,695],{"class":660},"console",[646,697,590],{"class":656},[646,699,701],{"class":700},"s2Zo4","log",[646,703,704],{"class":660},"(EVLOG_VERSION)    ",[646,706,708],{"class":707},"sHwdD","\u002F\u002F → \"2.16.0\"\n",[646,710,712,714,716,718,721],{"class":648,"line":711},4,[646,713,695],{"class":660},[646,715,590],{"class":656},[646,717,701],{"class":700},[646,719,720],{"class":660},"(EVLOG_USER_AGENT) ",[646,722,723],{"class":707},"\u002F\u002F → \"evlog\u002F2.16.0\"\n",[592,725,727],{"id":726},"overriding-from-a-custom-drain","Overriding from a custom drain",[507,729,730,731,737,738,741,742,745,746,741,748,751],{},"Adapters built with ",[732,733,734],"a",{"href":462},[535,735,736],{},"defineHttpDrain()"," automatically pass the drain ",[535,739,740],{},"name"," as ",[535,743,744],{},"source"," and the canonical ",[535,747,542],{},[535,749,750],{},"userAgent",". You don't need to think about it.",[507,753,754,755,758,759,761,762,764,765,767],{},"When you build a drain on top of ",[535,756,757],{},"httpPost"," from ",[535,760,634],{}," directly (e.g. for a fork with a different identity, or for a vendor that wants its own UA), pass ",[535,763,744],{}," and\u002For ",[535,766,750],{}," to override:",[637,769,771],{"className":639,"code":770,"language":641,"meta":642,"style":642},"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",[535,772,773,792,796,809,829,858,875,889,906,925,945,954],{"__ignoreMap":642},[646,774,775,777,779,782,784,786,788,790],{"class":648,"line":649},[646,776,653],{"class":652},[646,778,657],{"class":656},[646,780,781],{"class":660}," httpPost",[646,783,670],{"class":656},[646,785,673],{"class":652},[646,787,676],{"class":656},[646,789,634],{"class":679},[646,791,682],{"class":656},[646,793,794],{"class":648,"line":685},[646,795,689],{"emptyLinePlaceholder":688},[646,797,798,801,803,806],{"class":648,"line":692},[646,799,800],{"class":652},"await",[646,802,781],{"class":700},[646,804,805],{"class":660},"(",[646,807,808],{"class":656},"{\n",[646,810,811,815,818,820,823,826],{"class":648,"line":711},[646,812,814],{"class":813},"swJcz","  url",[646,816,817],{"class":656},":",[646,819,676],{"class":656},[646,821,822],{"class":679},"https:\u002F\u002Fmy-platform.example.com\u002Fingest",[646,824,825],{"class":656},"'",[646,827,828],{"class":656},",\n",[646,830,832,835,837,839,841,844,846,848,850,853,855],{"class":648,"line":831},5,[646,833,834],{"class":813},"  headers",[646,836,817],{"class":656},[646,838,657],{"class":656},[646,840,676],{"class":656},[646,842,843],{"class":813},"Content-Type",[646,845,825],{"class":656},[646,847,817],{"class":656},[646,849,676],{"class":656},[646,851,852],{"class":679},"application\u002Fjson",[646,854,825],{"class":656},[646,856,857],{"class":656}," },\n",[646,859,861,864,866,868,871,873],{"class":648,"line":860},6,[646,862,863],{"class":813},"  body",[646,865,817],{"class":656},[646,867,676],{"class":656},[646,869,870],{"class":679},"[]",[646,872,825],{"class":656},[646,874,828],{"class":656},[646,876,878,881,883,887],{"class":648,"line":877},7,[646,879,880],{"class":813},"  timeout",[646,882,817],{"class":656},[646,884,886],{"class":885},"sbssI"," 5000",[646,888,828],{"class":656},[646,890,892,895,897,899,902,904],{"class":648,"line":891},8,[646,893,894],{"class":813},"  label",[646,896,817],{"class":656},[646,898,676],{"class":656},[646,900,901],{"class":679},"my-platform",[646,903,825],{"class":656},[646,905,828],{"class":656},[646,907,909,912,914,916,918,920,922],{"class":648,"line":908},9,[646,910,911],{"class":813},"  source",[646,913,817],{"class":656},[646,915,676],{"class":656},[646,917,901],{"class":679},[646,919,825],{"class":656},[646,921,664],{"class":656},[646,923,924],{"class":707},"           \u002F\u002F sent as X-Evlog-Source\n",[646,926,928,931,933,935,938,940,942],{"class":648,"line":927},10,[646,929,930],{"class":813},"  userAgent",[646,932,817],{"class":656},[646,934,676],{"class":656},[646,936,937],{"class":679},"my-fork\u002F1.0",[646,939,825],{"class":656},[646,941,664],{"class":656},[646,943,944],{"class":707},"        \u002F\u002F overrides the default User-Agent\n",[646,946,948,951],{"class":648,"line":947},11,[646,949,950],{"class":707},"  \u002F\u002F userAgent: false,",[646,952,953],{"class":707},"             \u002F\u002F suppress the header entirely\n",[646,955,957,960],{"class":648,"line":956},12,[646,958,959],{"class":656},"}",[646,961,962],{"class":660},")\n",[592,964,966],{"id":965},"next-steps","Next steps",[597,968,969,979],{},[600,970,971,974,975,978],{},[732,972,973],{"href":462},"Custom Drains"," — ",[535,976,977],{},"defineHttpDrain"," injects identity headers automatically",[600,980,981,984],{},[732,982,983],{"href":467},"Drain Pipeline"," — wrap any drain in batch + retry while keeping identity headers",[986,987,988],"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":642,"searchDepth":685,"depth":685,"links":990},[991,992,993,994],{"id":594,"depth":685,"text":595},{"id":627,"depth":685,"text":628},{"id":726,"depth":685,"text":727},{"id":965,"depth":685,"text":966},"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",[998],{"label":973,"icon":464,"to":462,"color":999,"variant":1000},"neutral","subtle",{},{"title":456,"icon":459},{"title":502,"description":995},"gfvY7aCTYjht3OcMEXXfgha2PlhYsOnqpwm73GY9l_s",[1006,1008],{"title":452,"path":453,"stem":454,"description":1007,"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":461,"path":462,"stem":463,"description":1009,"icon":464,"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.",1785016758119]