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traffic:",[623,624,625,638],"table",{},[626,627,628],"thead",{},[629,630,631,635],"tr",{},[632,633,634],"th",{},"Header",[632,636,637],{},"Value",[639,640,641,656],"tbody",{},[629,642,643,650],{},[644,645,646],"td",{},[647,648,649],"code",{},"User-Agent",[644,651,652,655],{},[647,653,654],{},"evlog\u002F\u003Cversion>"," (Node \u002F server runtimes only — browsers strip this header)",[629,657,658,663],{},[644,659,660],{},[647,661,662],{},"X-Evlog-Source",[644,664,665,666,669,670,669,673,669,676,669,679,669,682,669,685,688],{},"The adapter name (",[647,667,668],{},"axiom",", ",[647,671,672],{},"datadog",[647,674,675],{},"otlp",[647,677,678],{},"posthog",[647,680,681],{},"sentry",[647,683,684],{},"better-stack",[647,686,687],{},"client",", …)",[619,690,691,692,695,696,699,700,702],{},"The browser-side ",[647,693,694],{},"evlog\u002Fhttp"," drain (used by client logging) sets ",[647,697,698],{},"X-Evlog-Source: client"," instead, since browsers cannot override ",[647,701,649],{},".",[704,705,707],"h2",{"id":706},"why","Why",[709,710,711,719,728],"ul",{},[712,713,714,718],"li",{},[715,716,717],"strong",{},"Triage at the receiver."," Quickly distinguish evlog traffic from other clients in the receiving system's logs.",[712,720,721,724,725,727],{},[715,722,723],{},"Track adapter usage and version drift."," Roll out a new evlog version and watch the ",[647,726,649],{}," distribution change centrally.",[712,729,730,733,734,736],{},[715,731,732],{},"Debug a specific drain."," Filter by ",[647,735,662],{}," to isolate one adapter's behavior in a sea of incoming requests.",[704,738,740],{"id":739},"reading-the-version","Reading the version",[619,742,743,744,747],{},"Both constants are exported from ",[647,745,746],{},"evlog\u002Ftoolkit"," so your drain (or your receiver) can reference the canonical values:",[749,750,755],"pre",{"className":751,"code":752,"language":753,"meta":754,"style":754},"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","",[647,756,757,795,802,821],{"__ignoreMap":754},[758,759,762,766,770,774,777,780,783,786,789,792],"span",{"class":760,"line":761},"line",1,[758,763,765],{"class":764},"s7zQu","import",[758,767,769],{"class":768},"sMK4o"," {",[758,771,773],{"class":772},"sTEyZ"," EVLOG_USER_AGENT",[758,775,776],{"class":768},",",[758,778,779],{"class":772}," EVLOG_VERSION",[758,781,782],{"class":768}," }",[758,784,785],{"class":764}," from",[758,787,788],{"class":768}," '",[758,790,746],{"class":791},"sfazB",[758,793,794],{"class":768},"'\n",[758,796,798],{"class":760,"line":797},2,[758,799,801],{"emptyLinePlaceholder":800},true,"\n",[758,803,805,808,810,814,817],{"class":760,"line":804},3,[758,806,807],{"class":772},"console",[758,809,702],{"class":768},[758,811,813],{"class":812},"s2Zo4","log",[758,815,816],{"class":772},"(EVLOG_VERSION)    ",[758,818,820],{"class":819},"sHwdD","\u002F\u002F → \"2.16.0\"\n",[758,822,824,826,828,830,833],{"class":760,"line":823},4,[758,825,807],{"class":772},[758,827,702],{"class":768},[758,829,813],{"class":812},[758,831,832],{"class":772},"(EVLOG_USER_AGENT) ",[758,834,835],{"class":819},"\u002F\u002F → \"evlog\u002F2.16.0\"\n",[704,837,839],{"id":838},"overriding-from-a-custom-drain","Overriding from a custom drain",[619,841,842,843,849,850,853,854,857,858,853,860,863],{},"Adapters built with ",[844,845,846],"a",{"href":540},[647,847,848],{},"defineHttpDrain()"," automatically pass the drain ",[647,851,852],{},"name"," as ",[647,855,856],{},"source"," and the canonical ",[647,859,654],{},[647,861,862],{},"userAgent",". You don't need to think about it.",[619,865,866,867,870,871,873,874,876,877,879],{},"When you build a drain on top of ",[647,868,869],{},"httpPost"," from ",[647,872,746],{}," directly (e.g. for a fork with a different identity, or for a vendor that wants its own UA), pass ",[647,875,856],{}," and\u002For ",[647,878,862],{}," to override:",[749,881,883],{"className":751,"code":882,"language":753,"meta":754,"style":754},"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",[647,884,885,904,908,921,941,970,987,1001,1018,1037,1057,1066],{"__ignoreMap":754},[758,886,887,889,891,894,896,898,900,902],{"class":760,"line":761},[758,888,765],{"class":764},[758,890,769],{"class":768},[758,892,893],{"class":772}," httpPost",[758,895,782],{"class":768},[758,897,785],{"class":764},[758,899,788],{"class":768},[758,901,746],{"class":791},[758,903,794],{"class":768},[758,905,906],{"class":760,"line":797},[758,907,801],{"emptyLinePlaceholder":800},[758,909,910,913,915,918],{"class":760,"line":804},[758,911,912],{"class":764},"await",[758,914,893],{"class":812},[758,916,917],{"class":772},"(",[758,919,920],{"class":768},"{\n",[758,922,923,927,930,932,935,938],{"class":760,"line":823},[758,924,926],{"class":925},"swJcz","  url",[758,928,929],{"class":768},":",[758,931,788],{"class":768},[758,933,934],{"class":791},"https:\u002F\u002Fmy-platform.example.com\u002Fingest",[758,936,937],{"class":768},"'",[758,939,940],{"class":768},",\n",[758,942,944,947,949,951,953,956,958,960,962,965,967],{"class":760,"line":943},5,[758,945,946],{"class":925},"  headers",[758,948,929],{"class":768},[758,950,769],{"class":768},[758,952,788],{"class":768},[758,954,955],{"class":925},"Content-Type",[758,957,937],{"class":768},[758,959,929],{"class":768},[758,961,788],{"class":768},[758,963,964],{"class":791},"application\u002Fjson",[758,966,937],{"class":768},[758,968,969],{"class":768}," },\n",[758,971,973,976,978,980,983,985],{"class":760,"line":972},6,[758,974,975],{"class":925},"  body",[758,977,929],{"class":768},[758,979,788],{"class":768},[758,981,982],{"class":791},"[]",[758,984,937],{"class":768},[758,986,940],{"class":768},[758,988,990,993,995,999],{"class":760,"line":989},7,[758,991,992],{"class":925},"  timeout",[758,994,929],{"class":768},[758,996,998],{"class":997},"sbssI"," 5000",[758,1000,940],{"class":768},[758,1002,1004,1007,1009,1011,1014,1016],{"class":760,"line":1003},8,[758,1005,1006],{"class":925},"  label",[758,1008,929],{"class":768},[758,1010,788],{"class":768},[758,1012,1013],{"class":791},"my-platform",[758,1015,937],{"class":768},[758,1017,940],{"class":768},[758,1019,1021,1024,1026,1028,1030,1032,1034],{"class":760,"line":1020},9,[758,1022,1023],{"class":925},"  source",[758,1025,929],{"class":768},[758,1027,788],{"class":768},[758,1029,1013],{"class":791},[758,1031,937],{"class":768},[758,1033,776],{"class":768},[758,1035,1036],{"class":819},"           \u002F\u002F sent as X-Evlog-Source\n",[758,1038,1040,1043,1045,1047,1050,1052,1054],{"class":760,"line":1039},10,[758,1041,1042],{"class":925},"  userAgent",[758,1044,929],{"class":768},[758,1046,788],{"class":768},[758,1048,1049],{"class":791},"my-fork\u002F1.0",[758,1051,937],{"class":768},[758,1053,776],{"class":768},[758,1055,1056],{"class":819},"        \u002F\u002F overrides the default User-Agent\n",[758,1058,1060,1063],{"class":760,"line":1059},11,[758,1061,1062],{"class":819},"  \u002F\u002F userAgent: false,",[758,1064,1065],{"class":819},"             \u002F\u002F suppress the header entirely\n",[758,1067,1069,1072],{"class":760,"line":1068},12,[758,1070,1071],{"class":768},"}",[758,1073,1074],{"class":772},")\n",[704,1076,1078],{"id":1077},"next-steps","Next steps",[709,1080,1081,1091],{},[712,1082,1083,1086,1087,1090],{},[844,1084,1085],{"href":540},"Custom Drains",": ",[647,1088,1089],{},"defineHttpDrain"," injects identity headers automatically",[712,1092,1093,1096],{},[844,1094,1095],{"href":545},"Drain Pipeline",": wrap any drain in batch + retry while keeping identity headers",[1098,1099,1100],"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":754,"searchDepth":797,"depth":797,"links":1102},[1103,1104,1105,1106],{"id":706,"depth":797,"text":707},{"id":739,"depth":797,"text":740},{"id":838,"depth":797,"text":839},{"id":1077,"depth":797,"text":1078},"Every drain request carries User-Agent and X-Evlog-Source so receivers can triage the traffic. Override or suppress them when you need to.","md",[1110],{"label":1085,"icon":542,"to":540,"color":1111,"variant":1112},"neutral","subtle",{},{"title":534,"icon":537},{"title":614,"description":1107},"VHR_rh03hC4aVSKeQNRth7T1MV4dt4mEZ6J-K3NJvgc",[1118,1120],{"title":530,"path":531,"stem":532,"description":1119,"icon":69,"children":-1},"Decide after the fact whether to keep an event, knowing its status, duration, and errors. Keep every error, throw away healthy noise.",{"title":539,"path":540,"stem":541,"description":1121,"icon":542,"children":-1},"Build a drain for any backend without a built-in adapter. Config resolution, retries, timeouts, and identity headers are handled for you.",1789294040943]