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",[560,614,562],{},".",[617,618,620],"h2",{"id":619},"why","Why",[622,623,624,632,641],"ul",{},[625,626,627,631],"li",{},[628,629,630],"strong",{},"Triage at the receiver."," Quickly distinguish evlog traffic from other clients in the receiving system's logs.",[625,633,634,637,638,640],{},[628,635,636],{},"Track adapter usage and version drift."," Roll out a new evlog version and watch the ",[560,639,562],{}," distribution change centrally.",[625,642,643,646,647,649],{},[628,644,645],{},"Debug a specific drain."," Filter by ",[560,648,575],{}," to isolate one adapter's behavior in a sea of incoming requests.",[617,651,653],{"id":652},"reading-the-version","Reading the version",[532,655,656,657,660],{},"Both constants are exported from ",[560,658,659],{},"evlog\u002Ftoolkit"," so your drain (or your receiver) can reference the canonical values:",[662,663,668],"pre",{"className":664,"code":665,"language":666,"meta":667,"style":667},"language-ts shiki shiki-themes material-theme-lighter 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'",[671,703,659],{"class":704},"sfazB",[671,706,707],{"class":681},"'\n",[671,709,711],{"class":673,"line":710},2,[671,712,714],{"emptyLinePlaceholder":713},true,"\n",[671,716,718,721,723,727,730],{"class":673,"line":717},3,[671,719,720],{"class":685},"console",[671,722,615],{"class":681},[671,724,726],{"class":725},"s2Zo4","log",[671,728,729],{"class":685},"(EVLOG_VERSION)    ",[671,731,733],{"class":732},"sHwdD","\u002F\u002F → \"2.16.0\"\n",[671,735,737,739,741,743,746],{"class":673,"line":736},4,[671,738,720],{"class":685},[671,740,615],{"class":681},[671,742,726],{"class":725},[671,744,745],{"class":685},"(EVLOG_USER_AGENT) ",[671,747,748],{"class":732},"\u002F\u002F → \"evlog\u002F2.16.0\"\n",[617,750,752],{"id":751},"overriding-from-a-custom-drain","Overriding from a custom drain",[532,754,755,756,762,763,766,767,770,771,766,773,776],{},"Adapters built with ",[757,758,759],"a",{"href":487},[560,760,761],{},"defineHttpDrain()"," automatically pass the drain ",[560,764,765],{},"name"," as ",[560,768,769],{},"source"," and the canonical ",[560,772,567],{},[560,774,775],{},"userAgent",". You don't need to think about it.",[532,778,779,780,783,784,786,787,789,790,792],{},"When you build a drain on top of ",[560,781,782],{},"httpPost"," from ",[560,785,659],{}," directly (e.g. for a fork with a different identity, or for a vendor that wants its own UA), pass ",[560,788,769],{}," and\u002For ",[560,791,775],{}," to override:",[662,794,796],{"className":664,"code":795,"language":666,"meta":667,"style":667},"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",[560,797,798,817,821,834,854,883,900,914,931,950,970,979],{"__ignoreMap":667},[671,799,800,802,804,807,809,811,813,815],{"class":673,"line":674},[671,801,678],{"class":677},[671,803,682],{"class":681},[671,805,806],{"class":685}," httpPost",[671,808,695],{"class":681},[671,810,698],{"class":677},[671,812,701],{"class":681},[671,814,659],{"class":704},[671,816,707],{"class":681},[671,818,819],{"class":673,"line":710},[671,820,714],{"emptyLinePlaceholder":713},[671,822,823,826,828,831],{"class":673,"line":717},[671,824,825],{"class":677},"await",[671,827,806],{"class":725},[671,829,830],{"class":685},"(",[671,832,833],{"class":681},"{\n",[671,835,836,840,843,845,848,851],{"class":673,"line":736},[671,837,839],{"class":838},"swJcz","  url",[671,841,842],{"class":681},":",[671,844,701],{"class":681},[671,846,847],{"class":704},"https:\u002F\u002Fmy-platform.example.com\u002Fingest",[671,849,850],{"class":681},"'",[671,852,853],{"class":681},",\n",[671,855,857,860,862,864,866,869,871,873,875,878,880],{"class":673,"line":856},5,[671,858,859],{"class":838},"  headers",[671,861,842],{"class":681},[671,863,682],{"class":681},[671,865,701],{"class":681},[671,867,868],{"class":838},"Content-Type",[671,870,850],{"class":681},[671,872,842],{"class":681},[671,874,701],{"class":681},[671,876,877],{"class":704},"application\u002Fjson",[671,879,850],{"class":681},[671,881,882],{"class":681}," },\n",[671,884,886,889,891,893,896,898],{"class":673,"line":885},6,[671,887,888],{"class":838},"  body",[671,890,842],{"class":681},[671,892,701],{"class":681},[671,894,895],{"class":704},"[]",[671,897,850],{"class":681},[671,899,853],{"class":681},[671,901,903,906,908,912],{"class":673,"line":902},7,[671,904,905],{"class":838},"  timeout",[671,907,842],{"class":681},[671,909,911],{"class":910},"sbssI"," 5000",[671,913,853],{"class":681},[671,915,917,920,922,924,927,929],{"class":673,"line":916},8,[671,918,919],{"class":838},"  label",[671,921,842],{"class":681},[671,923,701],{"class":681},[671,925,926],{"class":704},"my-platform",[671,928,850],{"class":681},[671,930,853],{"class":681},[671,932,934,937,939,941,943,945,947],{"class":673,"line":933},9,[671,935,936],{"class":838},"  source",[671,938,842],{"class":681},[671,940,701],{"class":681},[671,942,926],{"class":704},[671,944,850],{"class":681},[671,946,689],{"class":681},[671,948,949],{"class":732},"           \u002F\u002F sent as X-Evlog-Source\n",[671,951,953,956,958,960,963,965,967],{"class":673,"line":952},10,[671,954,955],{"class":838},"  userAgent",[671,957,842],{"class":681},[671,959,701],{"class":681},[671,961,962],{"class":704},"my-fork\u002F1.0",[671,964,850],{"class":681},[671,966,689],{"class":681},[671,968,969],{"class":732},"        \u002F\u002F overrides the default User-Agent\n",[671,971,973,976],{"class":673,"line":972},11,[671,974,975],{"class":732},"  \u002F\u002F userAgent: false,",[671,977,978],{"class":732},"             \u002F\u002F suppress the header entirely\n",[671,980,982,985],{"class":673,"line":981},12,[671,983,984],{"class":681},"}",[671,986,987],{"class":685},")\n",[617,989,991],{"id":990},"next-steps","Next steps",[622,993,994,1004],{},[625,995,996,999,1000,1003],{},[757,997,998],{"href":487},"Custom Drains"," — ",[560,1001,1002],{},"defineHttpDrain"," injects identity headers automatically",[625,1005,1006,1009],{},[757,1007,1008],{"href":492},"Drain Pipeline"," — wrap any drain in batch + retry while keeping identity headers",[1011,1012,1013],"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":667,"searchDepth":710,"depth":710,"links":1015},[1016,1017,1018,1019],{"id":619,"depth":710,"text":620},{"id":652,"depth":710,"text":653},{"id":751,"depth":710,"text":752},{"id":990,"depth":710,"text":991},"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",[1023],{"label":998,"icon":489,"to":487,"color":1024,"variant":1025},"neutral","subtle",{},{"title":481,"icon":484},{"title":527,"description":1020},"gfvY7aCTYjht3OcMEXXfgha2PlhYsOnqpwm73GY9l_s",[1031,1033],{"title":477,"path":478,"stem":479,"description":1032,"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":486,"path":487,"stem":488,"description":1034,"icon":489,"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.",1785674486634]