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",[545,599,547],{},".",[602,603,605],"h2",{"id":604},"why","Why",[607,608,609,617,626],"ul",{},[610,611,612,616],"li",{},[613,614,615],"strong",{},"Triage at the receiver."," Quickly distinguish evlog traffic from other clients in the receiving system's logs.",[610,618,619,622,623,625],{},[613,620,621],{},"Track adapter usage and version drift."," Roll out a new evlog version and watch the ",[545,624,547],{}," distribution change centrally.",[610,627,628,631,632,634],{},[613,629,630],{},"Debug a specific drain."," Filter by ",[545,633,560],{}," to isolate one adapter's behavior in a sea of incoming requests.",[602,636,638],{"id":637},"reading-the-version","Reading the version",[517,640,641,642,645],{},"Both constants are exported from ",[545,643,644],{},"evlog\u002Ftoolkit"," so your drain (or your receiver) can reference the canonical values:",[647,648,653],"pre",{"className":649,"code":650,"language":651,"meta":652,"style":652},"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","",[545,654,655,693,700,719],{"__ignoreMap":652},[656,657,660,664,668,672,675,678,681,684,687,690],"span",{"class":658,"line":659},"line",1,[656,661,663],{"class":662},"s7zQu","import",[656,665,667],{"class":666},"sMK4o"," {",[656,669,671],{"class":670},"sTEyZ"," EVLOG_USER_AGENT",[656,673,674],{"class":666},",",[656,676,677],{"class":670}," EVLOG_VERSION",[656,679,680],{"class":666}," }",[656,682,683],{"class":662}," from",[656,685,686],{"class":666}," '",[656,688,644],{"class":689},"sfazB",[656,691,692],{"class":666},"'\n",[656,694,696],{"class":658,"line":695},2,[656,697,699],{"emptyLinePlaceholder":698},true,"\n",[656,701,703,706,708,712,715],{"class":658,"line":702},3,[656,704,705],{"class":670},"console",[656,707,600],{"class":666},[656,709,711],{"class":710},"s2Zo4","log",[656,713,714],{"class":670},"(EVLOG_VERSION)    ",[656,716,718],{"class":717},"sHwdD","\u002F\u002F → \"2.16.0\"\n",[656,720,722,724,726,728,731],{"class":658,"line":721},4,[656,723,705],{"class":670},[656,725,600],{"class":666},[656,727,711],{"class":710},[656,729,730],{"class":670},"(EVLOG_USER_AGENT) ",[656,732,733],{"class":717},"\u002F\u002F → \"evlog\u002F2.16.0\"\n",[602,735,737],{"id":736},"overriding-from-a-custom-drain","Overriding from a custom drain",[517,739,740,741,747,748,751,752,755,756,751,758,761],{},"Adapters built with ",[742,743,744],"a",{"href":472},[545,745,746],{},"defineHttpDrain()"," automatically pass the drain ",[545,749,750],{},"name"," as ",[545,753,754],{},"source"," and the canonical ",[545,757,552],{},[545,759,760],{},"userAgent",". You don't need to think about it.",[517,763,764,765,768,769,771,772,774,775,777],{},"When you build a drain on top of ",[545,766,767],{},"httpPost"," from ",[545,770,644],{}," directly (e.g. for a fork with a different identity, or for a vendor that wants its own UA), pass ",[545,773,754],{}," and\u002For ",[545,776,760],{}," to override:",[647,779,781],{"className":649,"code":780,"language":651,"meta":652,"style":652},"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",[545,782,783,802,806,819,839,868,885,899,916,935,955,964],{"__ignoreMap":652},[656,784,785,787,789,792,794,796,798,800],{"class":658,"line":659},[656,786,663],{"class":662},[656,788,667],{"class":666},[656,790,791],{"class":670}," httpPost",[656,793,680],{"class":666},[656,795,683],{"class":662},[656,797,686],{"class":666},[656,799,644],{"class":689},[656,801,692],{"class":666},[656,803,804],{"class":658,"line":695},[656,805,699],{"emptyLinePlaceholder":698},[656,807,808,811,813,816],{"class":658,"line":702},[656,809,810],{"class":662},"await",[656,812,791],{"class":710},[656,814,815],{"class":670},"(",[656,817,818],{"class":666},"{\n",[656,820,821,825,828,830,833,836],{"class":658,"line":721},[656,822,824],{"class":823},"swJcz","  url",[656,826,827],{"class":666},":",[656,829,686],{"class":666},[656,831,832],{"class":689},"https:\u002F\u002Fmy-platform.example.com\u002Fingest",[656,834,835],{"class":666},"'",[656,837,838],{"class":666},",\n",[656,840,842,845,847,849,851,854,856,858,860,863,865],{"class":658,"line":841},5,[656,843,844],{"class":823},"  headers",[656,846,827],{"class":666},[656,848,667],{"class":666},[656,850,686],{"class":666},[656,852,853],{"class":823},"Content-Type",[656,855,835],{"class":666},[656,857,827],{"class":666},[656,859,686],{"class":666},[656,861,862],{"class":689},"application\u002Fjson",[656,864,835],{"class":666},[656,866,867],{"class":666}," },\n",[656,869,871,874,876,878,881,883],{"class":658,"line":870},6,[656,872,873],{"class":823},"  body",[656,875,827],{"class":666},[656,877,686],{"class":666},[656,879,880],{"class":689},"[]",[656,882,835],{"class":666},[656,884,838],{"class":666},[656,886,888,891,893,897],{"class":658,"line":887},7,[656,889,890],{"class":823},"  timeout",[656,892,827],{"class":666},[656,894,896],{"class":895},"sbssI"," 5000",[656,898,838],{"class":666},[656,900,902,905,907,909,912,914],{"class":658,"line":901},8,[656,903,904],{"class":823},"  label",[656,906,827],{"class":666},[656,908,686],{"class":666},[656,910,911],{"class":689},"my-platform",[656,913,835],{"class":666},[656,915,838],{"class":666},[656,917,919,922,924,926,928,930,932],{"class":658,"line":918},9,[656,920,921],{"class":823},"  source",[656,923,827],{"class":666},[656,925,686],{"class":666},[656,927,911],{"class":689},[656,929,835],{"class":666},[656,931,674],{"class":666},[656,933,934],{"class":717},"           \u002F\u002F sent as X-Evlog-Source\n",[656,936,938,941,943,945,948,950,952],{"class":658,"line":937},10,[656,939,940],{"class":823},"  userAgent",[656,942,827],{"class":666},[656,944,686],{"class":666},[656,946,947],{"class":689},"my-fork\u002F1.0",[656,949,835],{"class":666},[656,951,674],{"class":666},[656,953,954],{"class":717},"        \u002F\u002F overrides the default User-Agent\n",[656,956,958,961],{"class":658,"line":957},11,[656,959,960],{"class":717},"  \u002F\u002F userAgent: false,",[656,962,963],{"class":717},"             \u002F\u002F suppress the header entirely\n",[656,965,967,970],{"class":658,"line":966},12,[656,968,969],{"class":666},"}",[656,971,972],{"class":670},")\n",[602,974,976],{"id":975},"next-steps","Next steps",[607,978,979,989],{},[610,980,981,984,985,988],{},[742,982,983],{"href":472},"Custom Drains"," — ",[545,986,987],{},"defineHttpDrain"," injects identity headers automatically",[610,990,991,994],{},[742,992,993],{"href":477},"Drain Pipeline"," — wrap any drain in batch + retry while keeping identity headers",[996,997,998],"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":652,"searchDepth":695,"depth":695,"links":1000},[1001,1002,1003,1004],{"id":604,"depth":695,"text":605},{"id":637,"depth":695,"text":638},{"id":736,"depth":695,"text":737},{"id":975,"depth":695,"text":976},"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",[1008],{"label":983,"icon":474,"to":472,"color":1009,"variant":1010},"neutral","subtle",{},{"title":466,"icon":469},{"title":512,"description":1005},"gfvY7aCTYjht3OcMEXXfgha2PlhYsOnqpwm73GY9l_s",[1016,1018],{"title":462,"path":463,"stem":464,"description":1017,"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":471,"path":472,"stem":473,"description":1019,"icon":474,"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.",1785599608631]