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Same philosophy as HTTP logging: ",[603,604,605],"strong",{},"one command execution → one structured event",", not a stream of analytics calls.",[608,609,610,635,649,663],"code-group",{},[611,612,618],"pre",{"className":613,"code":614,"filename":615,"language":616,"meta":617,"style":617},"language-bash shiki shiki-themes material-theme-lighter material-theme material-theme-palenight","pnpm add @evlog\u002Ftelemetry\n","pnpm","bash","",[590,619,620],{"__ignoreMap":617},[621,622,625,628,632],"span",{"class":623,"line":624},"line",1,[621,626,615],{"class":627},"sBMFI",[621,629,631],{"class":630},"sfazB"," add",[621,633,634],{"class":630}," @evlog\u002Ftelemetry\n",[611,636,639],{"className":613,"code":637,"filename":638,"language":616,"meta":617,"style":617},"bun add @evlog\u002Ftelemetry\n","bun",[590,640,641],{"__ignoreMap":617},[621,642,643,645,647],{"class":623,"line":624},[621,644,638],{"class":627},[621,646,631],{"class":630},[621,648,634],{"class":630},[611,650,653],{"className":613,"code":651,"filename":652,"language":616,"meta":617,"style":617},"yarn add @evlog\u002Ftelemetry\n","yarn",[590,654,655],{"__ignoreMap":617},[621,656,657,659,661],{"class":623,"line":624},[621,658,652],{"class":627},[621,660,631],{"class":630},[621,662,634],{"class":630},[611,664,667],{"className":613,"code":665,"filename":666,"language":616,"meta":617,"style":617},"npm install @evlog\u002Ftelemetry\n","npm",[590,668,669],{"__ignoreMap":617},[621,670,671,673,676],{"class":623,"line":624},[621,672,666],{"class":627},[621,674,675],{"class":630}," install",[621,677,634],{"class":630},[587,679,680,681,684,685,688],{},"You get command name, sanitized flags, duration, and outcome automatically. Call ",[590,682,683],{},"telemetry.set()"," only when you have extra counters, numbers and booleans by default. Raw ",[590,686,687],{},"argv"," is never read; disclosure is generated from your runtime config so it cannot drift from what you actually collect.",[690,691,694,697,847],"prompt",{":actions":692,"description":693,"icon":112},"[\"copy\",\"cursor\",\"claude\"]","Add anonymous telemetry to my CLI or script",[587,695,696],{},"Add privacy-respecting telemetry to my CLI, script, or GitHub Action with @evlog\u002Ftelemetry.",[698,699,700,716,723,737,747,765,779,792,798,809,820],"ul",{},[701,702,703,704,707,708,711,712,715],"li",{},"Detect my entrypoint: citty CLI (",[590,705,706],{},"withTelemetry","), standalone script (",[590,709,710],{},"createTelemetry","), or GitHub Actions (",[590,713,714],{},"createGitHubActionsTelemetry",")",[701,717,718,719,722],{},"Install: ",[590,720,721],{},"pnpm add @evlog\u002Ftelemetry"," (or npm\u002Fyarn\u002Fbun)",[701,724,725,726,729,730,733,734],{},"Citty: wrap the root command in ",[590,727,728],{},"withTelemetry()"," in ",[590,731,732],{},"src\u002Findex.ts"," and add ",[590,735,736],{},"defineTelemetryCommands({ name: TOOL })",[701,738,739,740,743,744],{},"Script \u002F migrator: ",[590,741,742],{},"createTelemetry({ name, version })"," and wrap each logical unit with ",[590,745,746],{},"t.run('command', fn)",[701,748,749,750,753,754,757,758,761,762],{},"GitHub Actions: ",[590,751,752],{},"createGitHubActionsTelemetry()",". Only ",[590,755,756],{},"GITHUB_ACTION"," \u002F ",[590,759,760],{},"GITHUB_EVENT_NAME"," are injected into ",[590,763,764],{},"custom",[701,766,767,768,757,771,774,775,778],{},"Declare ",[590,769,770],{},"collect.flags",[590,772,773],{},"collect.fields"," for any string values you need beyond the ",[590,776,777],{},"\"\u003Cset>\""," marker",[701,780,781,782,784,785,787,788],{},"Put your product schema in ",[590,783,764],{}," via ",[590,786,683],{},", see ",[595,789,791],{"href":790},"\u002Fuse-cases\u002Ftelemetry\u002Freference#extending-the-schema","Extending the schema",[701,793,794,795,797],{},"Call ",[590,796,683],{}," for business counters (numbers\u002Fbooleans) inside handlers or helpers on the same async stack",[701,799,800,801,804,805,808],{},"Run ",[590,802,803],{},"generateDisclosure()"," and commit ",[590,806,807],{},"TELEMETRY.md"," beside the tool",[701,810,811,812,815,816,819],{},"Bake an ingestion URL in ",[590,813,814],{},"endpoint"," (or ",[590,817,818],{},"EVLOG_TELEMETRY_ENDPOINT","). The local outbox is a buffer, not the destination",[701,821,822,823,826,827,830,831,834,835,838,839,842,843,846],{},"Ship ",[590,824,825],{},"POST \u002Fapi\u002Ftelemetry\u002Fingest"," on my app: use ",[590,828,829],{},"parseIngestBody()"," from ",[590,832,833],{},"@evlog\u002Ftelemetry\u002Fingest"," with ",[590,836,837],{},"allowedTools"," + ",[590,840,841],{},"allowedCustomKeys",", dedupe on ",[590,844,845],{},"idempotencyKey",", return 204 on success",[587,848,849,850],{},"Docs: ",[595,851,852],{"href":852,"rel":853},"https:\u002F\u002Fwww.evlog.dev\u002Fuse-cases\u002Ftelemetry\u002Foverview",[599],[855,856,858],"h2",{"id":857},"from-cli-to-your-backend","From CLI to your backend",[587,860,861,862,865,866,869,870,873],{},"The disk outbox (",[590,863,864],{},"~\u002F.config\u002F{toolName}\u002Ftelemetry\u002Foutbox.ndjson",") is a ",[603,867,868],{},"reliability buffer",", not where telemetry lives long-term. Each run appends one event locally, then the HTTP drain POSTs the backlog to ",[603,871,872],{},"your"," ingestion endpoint. Short-lived CI jobs and offline machines drain on the next invocation.",[875,876,877,887,898,906,916,926,935],"ol",{},[701,878,879,882,883,886],{},[603,880,881],{},"Run",": ",[590,884,885],{},"my-tool doctor"," executes on the user's machine",[701,888,889,882,892,894,895],{},[603,890,891],{},"Capture",[590,893,592],{}," sanitizes flags, checks consent, and records one ",[590,896,897],{},"RunEvent",[701,899,900,903,904],{},[603,901,902],{},"Buffer",": the event appends to ",[590,905,864],{},[701,907,908,911,912,915],{},[603,909,910],{},"Send",": on flush, POST ",[590,913,914],{},"{ events: RunEvent[] }"," to your ingest URL",[701,917,918,882,921,923,924,715],{},[603,919,920],{},"Validate",[590,922,829],{}," allowlists tools and custom keys (",[595,925,431],{"href":432},[701,927,928,931,932,934],{},[603,929,930],{},"Store",": dedupe on ",[590,933,845],{},", then DB \u002F warehouse \u002F evlog drain",[701,936,937,940,941,944],{},[603,938,939],{},"Ack",": on ",[590,942,943],{},"2xx",", delivered keys are removed from the outbox",[611,946,951],{"className":947,"code":949,"language":950,"meta":617},[948],"language-text","CLI → @evlog\u002Ftelemetry → outbox.ndjson → POST \u002Fingest → validate → store\n","text",[590,952,949],{"__ignoreMap":617},[587,954,955],{},"Nothing is sent until you configure an endpoint and the server returns a success status. Until then, events stay in the outbox (or are purged on opt-out).",[855,957,959],{"id":958},"why-install-it","Why install it",[587,961,962],{},"You can wire anonymous usage telemetry yourself: outbox file, consent flags, flag sanitization, disclosure markdown, ingest validation, first-run notice. Or you add one dependency and get the evlog playbook baked in.",[964,965,967],"h3",{"id":966},"what-you-get-for-28-kb","What you get for ~28 KB",[969,970,971,982],"table",{},[972,973,974],"thead",{},[975,976,977,980],"tr",{},[978,979],"th",{},[978,981],{},[983,984,985,1002,1017,1037],"tbody",{},[975,986,987,993],{},[988,989,990],"td",{},[603,991,992],{},"Published size",[988,994,995,996,998,999,1001],{},"~28 KB ESM (",[590,997,592],{},"), ~8.6 KB gzip — standalone, no dependency on ",[590,1000,600],{}," core",[975,1003,1004,1009],{},[988,1005,1006],{},[603,1007,1008],{},"Server ingest only",[988,1010,1011,1013,1014,1016],{},[590,1012,833],{}," ~5 KB (~1.7 KB gzip) — ",[590,1015,829],{}," without pulling citty wiring into your API",[975,1018,1019,1024],{},[988,1020,1021],{},[603,1022,1023],{},"Runtime deps",[988,1025,1026,838,1029,1032,1033,1036],{},[590,1027,1028],{},"citty",[590,1030,1031],{},"std-env"," only — both ",[590,1034,1035],{},"sideEffects: false",", tree-shakeable ESM",[975,1038,1039,1044],{},[988,1040,1041],{},[603,1042,1043],{},"Node",[988,1045,1046,1047,1049],{},"18+ · ESM · ",[590,1048,1035],{}," on the package",[964,1051,1053],{"id":1052},"fits-wherever-your-code-runs","Fits wherever your code runs",[969,1055,1056,1069],{},[972,1057,1058],{},[975,1059,1060,1063,1066],{},[978,1061,1062],{},"Surface",[978,1064,1065],{},"Entry",[978,1067,1068],{},"Lines of integration",[983,1070,1071,1089,1107,1128],{},[975,1072,1073,1078,1083],{},[988,1074,1075],{},[603,1076,1077],{},"citty CLI",[988,1079,1080,1082],{},[590,1081,728],{}," on the root command",[988,1084,1085,1086],{},"One wrapper + optional ",[590,1087,1088],{},"defineTelemetryCommands()",[975,1090,1091,1096,1104],{},[988,1092,1093],{},[603,1094,1095],{},"Script \u002F migrator",[988,1097,1098,838,1101],{},[590,1099,1100],{},"createTelemetry()",[590,1102,1103],{},"t.run()",[988,1105,1106],{},"Wrap each logical run",[975,1108,1109,1114,1118],{},[988,1110,1111],{},[603,1112,1113],{},"GitHub Actions",[988,1115,1116],{},[590,1117,752],{},[988,1119,1120,1121,757,1124,1127],{},"Same as script; ",[590,1122,1123],{},"ghaAction",[590,1125,1126],{},"ghaEvent"," auto-injected",[975,1129,1130,1135,1141],{},[988,1131,1132],{},[603,1133,1134],{},"Your API (ingest)",[988,1136,1137,830,1139],{},[590,1138,829],{},[590,1140,833],{},[988,1142,1143],{},"One validator + one POST route",[587,1145,1146,1147,1150],{},"No framework lock-in. No PostHog \u002F Segment \u002F custom analytics SDK. No second schema to maintain, since disclosure is generated from the same ",[590,1148,1149],{},"collect"," config the CLI uses at runtime.",[964,1152,1154],{"id":1153},"what-you-skip-building","What you skip building",[698,1156,1157,1162,1171,1174,1182,1185,1191,1194],{},[701,1158,1159,1160,715],{},"Privacy-safe flag capture (never reads raw ",[590,1161,687],{},[701,1163,1164,757,1167,1170],{},[590,1165,1166],{},"DO_NOT_TRACK",[590,1168,1169],{},"EVLOG_TELEMETRY"," \u002F persisted opt-out with outbox purge",[701,1172,1173],{},"Disk outbox with lockfile, stale-lock recovery, and backlog drain",[701,1175,1176,1177,838,1179,715],{},"Auto-generated disclosure (",[590,1178,807],{},[590,1180,1181],{},"telemetry status",[701,1183,1184],{},"First-run notice with opt-out instructions",[701,1186,1187,1188,1190],{},"Typed ",[590,1189,683],{}," with allowlisted string fields",[701,1192,1193],{},"Server-side ingest validation aligned with the CLI envelope",[701,1195,1196,1197],{},"Hard guarantee: ",[603,1198,1199],{},"telemetry never throws, never blocks exit",[964,1201,1203],{"id":1202},"the-payoff","The payoff",[587,1205,1206],{},"Once ingest is live you can answer product questions that CLI authors usually guess at:",[698,1208,1209,1220,1231,1238,1245],{},[701,1210,1211,1212,1214,1215,1214,1218,715],{},"Which commands are actually used (",[590,1213,119],{}," vs ",[590,1216,1217],{},"sync",[590,1219,1181],{},[701,1221,1222,1223,1226,1227,1230],{},"Where runs fail (",[590,1224,1225],{},"outcome",", ",[590,1228,1229],{},"errorCode",", version breakdown)",[701,1232,1233,1234,1237],{},"How long operations take (",[590,1235,1236],{},"durationMs"," per command)",[701,1239,1240,1241,1244],{},"Which versions are still in the wild (",[590,1242,1243],{},"tool.version"," on every event)",[701,1246,1247,1248,1226,1251,1226,1254,715],{},"Whether CI or local dev dominates (",[590,1249,1250],{},"env.ci",[590,1252,1253],{},"env.agent",[590,1255,1256],{},"env.tty",[587,1258,1259],{},"All from one wide event per run, the same mental model as evlog on the server, without bolting a browser analytics stack onto a terminal tool.",[1261,1262,1264,1265,882,1272,1226,1275,1278,1279,1281],"callout",{"color":1263,"icon":457},"neutral","Try it locally: ",[595,1266,1269],{"href":1267,"rel":1268},"https:\u002F\u002Fgithub.com\u002Fevloghq\u002Fevlog\u002Ftree\u002Fmain\u002Fexamples\u002Ftelemetry-playground",[599],[590,1270,1271],{},"examples\u002Ftelemetry-playground",[590,1273,1274],{},"pnpm run cli -- doctor",[590,1276,1277],{},"EVLOG_TELEMETRY_DEBUG=1"," to inspect payloads, ",[590,1280,1181],{}," for disclosure.",[855,1283,1285],{"id":1284},"see-also","See also",[698,1287,1288,1293,1298,1303,1309],{},[701,1289,1290,1292],{},[595,1291,426],{"href":427},": citty, scripts, GitHub Actions, delivery config",[701,1294,1295,1297],{},[595,1296,431],{"href":432},": server endpoint, validation, storage",[701,1299,1300,1302],{},[595,1301,436],{"href":437},": envelope, schema extensions, disclosure, consent",[701,1304,1305,1308],{},[595,1306,1307],{"href":393},"Audit",": wide events for security-sensitive actions",[701,1310,1311,1313],{},[595,1312,513],{"href":514},": forward ingested events into Axiom, Datadog, OTLP, or a custom store",[1315,1316,1317],"style",{},"html pre.shiki code .sBMFI, html code.shiki .sBMFI{--shiki-light:#E2931D;--shiki-default:#FFCB6B;--shiki-dark:#FFCB6B}html pre.shiki code .sfazB, html code.shiki .sfazB{--shiki-light:#91B859;--shiki-default:#C3E88D;--shiki-dark:#C3E88D}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);}",{"title":617,"searchDepth":1319,"depth":1319,"links":1320},2,[1321,1322,1329],{"id":857,"depth":1319,"text":858},{"id":958,"depth":1319,"text":959,"children":1323},[1324,1326,1327,1328],{"id":966,"depth":1325,"text":967},3,{"id":1052,"depth":1325,"text":1053},{"id":1153,"depth":1325,"text":1154},{"id":1202,"depth":1325,"text":1203},{"id":1284,"depth":1319,"text":1285},"One event per run for CLIs and automation, with privacy-safe flags, consent, an outbox, and disclosure generated from the same config.","md",[1333,1335,1336],{"label":426,"icon":429,"to":427,"color":1263,"variant":1334},"subtle",{"label":431,"icon":434,"to":432,"color":1263,"variant":1334},{"label":436,"icon":84,"to":437,"color":1263,"variant":1334},{},{"title":41,"icon":44},{"title":124,"description":1330},"Gb7FHqy5yh1KpnsU8Ghkee_rw-LOn-NRxW1nZ6xcYk8",[1342,1344],{"title":415,"path":416,"stem":417,"description":1343,"icon":84,"children":-1},"File system, Axiom, and Postgres recipes for audit logs, plus mockAudit for tests and the full API reference.",{"title":426,"path":427,"stem":428,"description":1345,"icon":429,"children":-1},"Wire @evlog\u002Ftelemetry into citty CLIs, standalone scripts, and GitHub Actions — delivery config, automatic flag capture, telemetry.set(), and debug mode.",1789074371274]