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A signal tells you it was Stripe, that a retry would have worked, and that it is not worth waking anyone. Your logs tell you a checkout returned 200. A signal tells you the customer left without an order.",[608,612,613,617],{},[614,615,616],"code",{},"@evlog\u002Fsignals"," asks a decision model one question per event and writes the answer onto the event as a column, with a confidence. You query it like any other field.",[619,620,622],"h2",{"id":621},"what-you-get","What you get",[608,624,625],{},"A signal is a question in English, attached to the events it applies to. When an event matches, the model reads it, answers with a probability for each option, and the answer is written back onto the event as a typed column:",[627,628],"signal-ask",{},[608,630,631,632,635],{},"The question is the whole configuration. There is no prompt to tune and no parser to write: a yes\u002Fno gives a boolean, a list of options gives one of them, an ordered rubric gives a level and a position. Every column carries the model's confidence, so ",[614,633,634],{},"WHERE signals.fault.value = 'upstream' AND signals.fault.confidence > 0.9"," is a query, not a guess.",[608,637,638],{},"Three things that gives you, that a rule on the event's fields could not:",[640,641,642,662,672],"ul",{},[643,644,645,649,650,653,654,657,658,661],"li",{},[646,647,648],"strong",{},"Every error gets a reason."," ",[614,651,652],{},"fault=upstream"," on the Stripe 502, ",[614,655,656],{},"fault=app"," on the null deref. Two 5xx that look identical on a status chart are two rows in a ",[614,659,660],{},"GROUP BY",". Over a week that is a number: how much of your error budget is yours.",[643,663,664,667,668,671],{},[646,665,666],{},"A 200 can be a failure."," A checkout that answered 200 and created no order, a webhook acknowledged and dropped, an agent looping on the same tool call. No field on those events says anything is wrong; a signal with ",[614,669,670],{},"keep"," carries them past sampling, and the next section shows that.",[643,673,674,677,678,681],{},[646,675,676],{},"It costs nothing you would notice."," A decision model answers in one short call, every due signal in it: 15 requests in the demo run came to 14 calls, 1,569 input tokens, $0.00007. ",[679,680,468],"a",{"href":469}," has what that becomes at your traffic.",[619,683,685],{"id":684},"add-your-first-signal","Add your first signal",[687,688,691,694,726],"prompt",{":actions":689,"description":690,"icon":455},"[\"copy\",\"cursor\",\"claude\"]","Add signals to an evlog app",[608,692,693],{},"Add @evlog\u002Fsignals to my evlog app.",[640,695,696,699,707,713,716,723],{},[643,697,698],{},"Install: pnpm add @evlog\u002Fsignals ai (ai 7.0.105 or later)",[643,700,701,702,706],{},"Define signals with defineSignal({ name, when, ask }) plus choice: {...} for a pick-one answer or score: ",[703,704,705],"span",{},"..."," for a rubric; keep: v => ... promotes the event past sampling",[643,708,709,710,712],{},"Register with createSignals({ signals }): on Nuxt or Nitro hook plugin.keep on 'evlog:emit:keep' and plugin.enrich on 'evlog:enrich' in a server plugin; on Next.js or standalone pass it in initLogger({ plugins: ",[703,711,705],{}," }); on Hono, Express, Fastify or Elysia pass it in the middleware's plugins option",[643,714,715],{},"Set AI_GATEWAY_API_KEY (default model typesafe-ai\u002Fjev through AI Gateway)",[643,717,718,719],{},"Verdicts land on event.signals.",[720,721,722],"name",{},".{ value, confidence } in stdout and in every drain",[643,724,725],{},"In tests, pass evaluate from scriptedEvaluate() in @evlog\u002Fsignals\u002Ftesting so no model is called",[608,727,728,729],{},"Docs: ",[679,730,731],{"href":731,"rel":732},"https:\u002F\u002Fwww.evlog.dev\u002Fuse-cases\u002Fsignals\u002Foverview",[733],"nofollow",[735,736,738,743,771,782,786,789,1014,1018,1032,1644,1648,1651,1840],"steps",{"level":737},"3",[739,740,742],"h3",{"id":741},"install","Install",[744,745,751],"pre",{"className":746,"code":747,"filename":748,"language":749,"meta":750,"style":750},"language-bash shiki shiki-themes material-theme-lighter material-theme material-theme-palenight","pnpm add @evlog\u002Fsignals ai\n","Terminal","bash","",[614,752,753],{"__ignoreMap":750},[703,754,757,761,765,768],{"class":755,"line":756},"line",1,[703,758,760],{"class":759},"sBMFI","pnpm",[703,762,764],{"class":763},"sfazB"," add",[703,766,767],{"class":763}," @evlog\u002Fsignals",[703,769,770],{"class":763}," ai\n",[608,772,773,774,777,778,781],{},"The default model is ",[614,775,776],{},"typesafe-ai\u002Fjev"," through Vercel AI Gateway. Set ",[614,779,780],{},"AI_GATEWAY_API_KEY",", or nothing on Vercel, where OIDC is picked up.",[739,783,785],{"id":784},"write-the-question","Write the question",[608,787,788],{},"A signal is a name, a predicate that decides which events it applies to, and the question. This one labels every failure:",[744,790,795],{"className":791,"code":792,"filename":793,"language":794,"meta":750,"style":750},"language-typescript shiki shiki-themes material-theme-lighter material-theme material-theme-palenight","import { defineSignal } from '@evlog\u002Fsignals'\n\nexport const fault = defineSignal({\n  name: 'fault',\n  when: e => (e.status ?? 0) >= 400,\n  ask: 'Who is responsible for this failure?',\n  choice: {\n    client: 'Bad input, expired session, client mistake',\n    app: 'A bug or misconfiguration in our own code',\n    upstream: 'A third-party dependency failed',\n  },\n})\n","server\u002Fsignals.ts","typescript",[614,796,797,825,832,857,878,920,937,948,965,982,999,1005],{"__ignoreMap":750},[703,798,799,803,807,811,814,817,820,822],{"class":755,"line":756},[703,800,802],{"class":801},"s7zQu","import",[703,804,806],{"class":805},"sMK4o"," {",[703,808,810],{"class":809},"sTEyZ"," defineSignal",[703,812,813],{"class":805}," }",[703,815,816],{"class":801}," from",[703,818,819],{"class":805}," '",[703,821,616],{"class":763},[703,823,824],{"class":805},"'\n",[703,826,828],{"class":755,"line":827},2,[703,829,831],{"emptyLinePlaceholder":830},true,"\n",[703,833,835,838,842,845,848,851,854],{"class":755,"line":834},3,[703,836,837],{"class":801},"export",[703,839,841],{"class":840},"spNyl"," const",[703,843,844],{"class":809}," fault ",[703,846,847],{"class":805},"=",[703,849,810],{"class":850},"s2Zo4",[703,852,853],{"class":809},"(",[703,855,856],{"class":805},"{\n",[703,858,860,864,867,869,872,875],{"class":755,"line":859},4,[703,861,863],{"class":862},"swJcz","  name",[703,865,866],{"class":805},":",[703,868,819],{"class":805},[703,870,871],{"class":763},"fault",[703,873,874],{"class":805},"'",[703,876,877],{"class":805},",\n",[703,879,881,884,886,890,893,896,899,902,905,909,912,915,918],{"class":755,"line":880},5,[703,882,883],{"class":850},"  when",[703,885,866],{"class":805},[703,887,889],{"class":888},"sHdIc"," e",[703,891,892],{"class":840}," =>",[703,894,895],{"class":809}," (e",[703,897,898],{"class":805},".",[703,900,901],{"class":809},"status ",[703,903,904],{"class":805},"??",[703,906,908],{"class":907},"sbssI"," 0",[703,910,911],{"class":809},") ",[703,913,914],{"class":805},">=",[703,916,917],{"class":907}," 400",[703,919,877],{"class":805},[703,921,923,926,928,930,933,935],{"class":755,"line":922},6,[703,924,925],{"class":862},"  ask",[703,927,866],{"class":805},[703,929,819],{"class":805},[703,931,932],{"class":763},"Who is responsible for this failure?",[703,934,874],{"class":805},[703,936,877],{"class":805},[703,938,940,943,945],{"class":755,"line":939},7,[703,941,942],{"class":862},"  choice",[703,944,866],{"class":805},[703,946,947],{"class":805}," {\n",[703,949,951,954,956,958,961,963],{"class":755,"line":950},8,[703,952,953],{"class":862},"    client",[703,955,866],{"class":805},[703,957,819],{"class":805},[703,959,960],{"class":763},"Bad input, expired session, client mistake",[703,962,874],{"class":805},[703,964,877],{"class":805},[703,966,968,971,973,975,978,980],{"class":755,"line":967},9,[703,969,970],{"class":862},"    app",[703,972,866],{"class":805},[703,974,819],{"class":805},[703,976,977],{"class":763},"A bug or misconfiguration in our own code",[703,979,874],{"class":805},[703,981,877],{"class":805},[703,983,985,988,990,992,995,997],{"class":755,"line":984},10,[703,986,987],{"class":862},"    upstream",[703,989,866],{"class":805},[703,991,819],{"class":805},[703,993,994],{"class":763},"A third-party dependency failed",[703,996,874],{"class":805},[703,998,877],{"class":805},[703,1000,1002],{"class":755,"line":1001},11,[703,1003,1004],{"class":805},"  },\n",[703,1006,1008,1011],{"class":755,"line":1007},12,[703,1009,1010],{"class":805},"}",[703,1012,1013],{"class":809},")\n",[739,1015,1017],{"id":1016},"register-it","Register it",[608,1019,1020,1023,1024,1027,1028,1031],{},[614,1021,1022],{},"createSignals"," returns an evlog ",[679,1025,1026],{"href":513},"plugin",". Nuxt and Nitro expose the two hooks directly; every other integration takes it in a ",[614,1029,1030],{},"plugins"," array:",[1033,1034,1035,1222,1331,1441,1547],"code-group",{},[744,1036,1039],{"className":791,"code":1037,"filename":1038,"language":794,"meta":750,"style":750},"\u002F\u002F server\u002Fplugins\u002Fevlog-signals.ts\nimport { createSignals } from '@evlog\u002Fsignals'\nimport { fault } from '..\u002Fsignals'\n\nexport default defineNitroPlugin((nitroApp) => {\n  const plugin = createSignals({ signals: [fault] })\n  nitroApp.hooks.hook('evlog:emit:keep', plugin.keep)\n  nitroApp.hooks.hook('evlog:enrich', plugin.enrich)\n})\n","Nuxt \u002F Nitro",[614,1040,1041,1047,1066,1086,1090,1114,1149,1184,1216],{"__ignoreMap":750},[703,1042,1043],{"class":755,"line":756},[703,1044,1046],{"class":1045},"sHwdD","\u002F\u002F server\u002Fplugins\u002Fevlog-signals.ts\n",[703,1048,1049,1051,1053,1056,1058,1060,1062,1064],{"class":755,"line":827},[703,1050,802],{"class":801},[703,1052,806],{"class":805},[703,1054,1055],{"class":809}," createSignals",[703,1057,813],{"class":805},[703,1059,816],{"class":801},[703,1061,819],{"class":805},[703,1063,616],{"class":763},[703,1065,824],{"class":805},[703,1067,1068,1070,1072,1075,1077,1079,1081,1084],{"class":755,"line":834},[703,1069,802],{"class":801},[703,1071,806],{"class":805},[703,1073,1074],{"class":809}," fault",[703,1076,813],{"class":805},[703,1078,816],{"class":801},[703,1080,819],{"class":805},[703,1082,1083],{"class":763},"..\u002Fsignals",[703,1085,824],{"class":805},[703,1087,1088],{"class":755,"line":859},[703,1089,831],{"emptyLinePlaceholder":830},[703,1091,1092,1094,1097,1100,1102,1104,1107,1110,1112],{"class":755,"line":880},[703,1093,837],{"class":801},[703,1095,1096],{"class":801}," default",[703,1098,1099],{"class":850}," defineNitroPlugin",[703,1101,853],{"class":809},[703,1103,853],{"class":805},[703,1105,1106],{"class":888},"nitroApp",[703,1108,1109],{"class":805},")",[703,1111,892],{"class":840},[703,1113,947],{"class":805},[703,1115,1116,1119,1122,1125,1127,1129,1132,1135,1137,1140,1142,1145,1147],{"class":755,"line":922},[703,1117,1118],{"class":840},"  const",[703,1120,1121],{"class":809}," plugin",[703,1123,1124],{"class":805}," =",[703,1126,1055],{"class":850},[703,1128,853],{"class":862},[703,1130,1131],{"class":805},"{",[703,1133,1134],{"class":862}," signals",[703,1136,866],{"class":805},[703,1138,1139],{"class":862}," [",[703,1141,871],{"class":809},[703,1143,1144],{"class":862},"] ",[703,1146,1010],{"class":805},[703,1148,1013],{"class":862},[703,1150,1151,1154,1156,1159,1161,1164,1166,1168,1171,1173,1176,1178,1180,1182],{"class":755,"line":939},[703,1152,1153],{"class":809},"  nitroApp",[703,1155,898],{"class":805},[703,1157,1158],{"class":809},"hooks",[703,1160,898],{"class":805},[703,1162,1163],{"class":850},"hook",[703,1165,853],{"class":862},[703,1167,874],{"class":805},[703,1169,1170],{"class":763},"evlog:emit:keep",[703,1172,874],{"class":805},[703,1174,1175],{"class":805},",",[703,1177,1121],{"class":809},[703,1179,898],{"class":805},[703,1181,670],{"class":809},[703,1183,1013],{"class":862},[703,1185,1186,1188,1190,1192,1194,1196,1198,1200,1203,1205,1207,1209,1211,1214],{"class":755,"line":950},[703,1187,1153],{"class":809},[703,1189,898],{"class":805},[703,1191,1158],{"class":809},[703,1193,898],{"class":805},[703,1195,1163],{"class":850},[703,1197,853],{"class":862},[703,1199,874],{"class":805},[703,1201,1202],{"class":763},"evlog:enrich",[703,1204,874],{"class":805},[703,1206,1175],{"class":805},[703,1208,1121],{"class":809},[703,1210,898],{"class":805},[703,1212,1213],{"class":809},"enrich",[703,1215,1013],{"class":862},[703,1217,1218,1220],{"class":755,"line":967},[703,1219,1010],{"class":805},[703,1221,1013],{"class":809},[744,1223,1225],{"className":791,"code":1224,"filename":245,"language":794,"meta":750,"style":750},"\u002F\u002F lib\u002Fevlog.ts\nimport { initLogger } from 'evlog'\nimport { createSignals } from '@evlog\u002Fsignals'\nimport { fault } from '.\u002Fsignals'\n\ninitLogger({ plugins: [createSignals({ signals: [fault] })] })\n",[614,1226,1227,1232,1252,1270,1289,1293],{"__ignoreMap":750},[703,1228,1229],{"class":755,"line":756},[703,1230,1231],{"class":1045},"\u002F\u002F lib\u002Fevlog.ts\n",[703,1233,1234,1236,1238,1241,1243,1245,1247,1250],{"class":755,"line":827},[703,1235,802],{"class":801},[703,1237,806],{"class":805},[703,1239,1240],{"class":809}," initLogger",[703,1242,813],{"class":805},[703,1244,816],{"class":801},[703,1246,819],{"class":805},[703,1248,1249],{"class":763},"evlog",[703,1251,824],{"class":805},[703,1253,1254,1256,1258,1260,1262,1264,1266,1268],{"class":755,"line":834},[703,1255,802],{"class":801},[703,1257,806],{"class":805},[703,1259,1055],{"class":809},[703,1261,813],{"class":805},[703,1263,816],{"class":801},[703,1265,819],{"class":805},[703,1267,616],{"class":763},[703,1269,824],{"class":805},[703,1271,1272,1274,1276,1278,1280,1282,1284,1287],{"class":755,"line":859},[703,1273,802],{"class":801},[703,1275,806],{"class":805},[703,1277,1074],{"class":809},[703,1279,813],{"class":805},[703,1281,816],{"class":801},[703,1283,819],{"class":805},[703,1285,1286],{"class":763},".\u002Fsignals",[703,1288,824],{"class":805},[703,1290,1291],{"class":755,"line":880},[703,1292,831],{"emptyLinePlaceholder":830},[703,1294,1295,1298,1300,1302,1305,1307,1309,1311,1313,1315,1317,1319,1322,1324,1327,1329],{"class":755,"line":922},[703,1296,1297],{"class":850},"initLogger",[703,1299,853],{"class":809},[703,1301,1131],{"class":805},[703,1303,1304],{"class":862}," plugins",[703,1306,866],{"class":805},[703,1308,1139],{"class":809},[703,1310,1022],{"class":850},[703,1312,853],{"class":809},[703,1314,1131],{"class":805},[703,1316,1134],{"class":862},[703,1318,866],{"class":805},[703,1320,1321],{"class":809}," [fault] ",[703,1323,1010],{"class":805},[703,1325,1326],{"class":809},")] ",[703,1328,1010],{"class":805},[703,1330,1013],{"class":809},[744,1332,1334],{"className":791,"code":1333,"filename":275,"language":794,"meta":750,"style":750},"import { evlog } from 'evlog\u002Fhono'\nimport { createSignals } from '@evlog\u002Fsignals'\nimport { fault } from '.\u002Fsignals'\n\napp.use(evlog({ plugins: [createSignals({ signals: [fault] })] }))\n",[614,1335,1336,1356,1374,1392,1396],{"__ignoreMap":750},[703,1337,1338,1340,1342,1345,1347,1349,1351,1354],{"class":755,"line":756},[703,1339,802],{"class":801},[703,1341,806],{"class":805},[703,1343,1344],{"class":809}," evlog",[703,1346,813],{"class":805},[703,1348,816],{"class":801},[703,1350,819],{"class":805},[703,1352,1353],{"class":763},"evlog\u002Fhono",[703,1355,824],{"class":805},[703,1357,1358,1360,1362,1364,1366,1368,1370,1372],{"class":755,"line":827},[703,1359,802],{"class":801},[703,1361,806],{"class":805},[703,1363,1055],{"class":809},[703,1365,813],{"class":805},[703,1367,816],{"class":801},[703,1369,819],{"class":805},[703,1371,616],{"class":763},[703,1373,824],{"class":805},[703,1375,1376,1378,1380,1382,1384,1386,1388,1390],{"class":755,"line":834},[703,1377,802],{"class":801},[703,1379,806],{"class":805},[703,1381,1074],{"class":809},[703,1383,813],{"class":805},[703,1385,816],{"class":801},[703,1387,819],{"class":805},[703,1389,1286],{"class":763},[703,1391,824],{"class":805},[703,1393,1394],{"class":755,"line":859},[703,1395,831],{"emptyLinePlaceholder":830},[703,1397,1398,1401,1403,1406,1408,1410,1412,1414,1416,1418,1420,1422,1424,1426,1428,1430,1432,1434,1436,1438],{"class":755,"line":880},[703,1399,1400],{"class":809},"app",[703,1402,898],{"class":805},[703,1404,1405],{"class":850},"use",[703,1407,853],{"class":809},[703,1409,1249],{"class":850},[703,1411,853],{"class":809},[703,1413,1131],{"class":805},[703,1415,1304],{"class":862},[703,1417,866],{"class":805},[703,1419,1139],{"class":809},[703,1421,1022],{"class":850},[703,1423,853],{"class":809},[703,1425,1131],{"class":805},[703,1427,1134],{"class":862},[703,1429,866],{"class":805},[703,1431,1321],{"class":809},[703,1433,1010],{"class":805},[703,1435,1326],{"class":809},[703,1437,1010],{"class":805},[703,1439,1440],{"class":809},"))\n",[744,1442,1444],{"className":791,"code":1443,"filename":270,"language":794,"meta":750,"style":750},"import { evlog } from 'evlog\u002Fexpress'\nimport { createSignals } from '@evlog\u002Fsignals'\nimport { fault } from '.\u002Fsignals'\n\napp.use(evlog({ plugins: [createSignals({ signals: [fault] })] }))\n",[614,1445,1446,1465,1483,1501,1505],{"__ignoreMap":750},[703,1447,1448,1450,1452,1454,1456,1458,1460,1463],{"class":755,"line":756},[703,1449,802],{"class":801},[703,1451,806],{"class":805},[703,1453,1344],{"class":809},[703,1455,813],{"class":805},[703,1457,816],{"class":801},[703,1459,819],{"class":805},[703,1461,1462],{"class":763},"evlog\u002Fexpress",[703,1464,824],{"class":805},[703,1466,1467,1469,1471,1473,1475,1477,1479,1481],{"class":755,"line":827},[703,1468,802],{"class":801},[703,1470,806],{"class":805},[703,1472,1055],{"class":809},[703,1474,813],{"class":805},[703,1476,816],{"class":801},[703,1478,819],{"class":805},[703,1480,616],{"class":763},[703,1482,824],{"class":805},[703,1484,1485,1487,1489,1491,1493,1495,1497,1499],{"class":755,"line":834},[703,1486,802],{"class":801},[703,1488,806],{"class":805},[703,1490,1074],{"class":809},[703,1492,813],{"class":805},[703,1494,816],{"class":801},[703,1496,819],{"class":805},[703,1498,1286],{"class":763},[703,1500,824],{"class":805},[703,1502,1503],{"class":755,"line":859},[703,1504,831],{"emptyLinePlaceholder":830},[703,1506,1507,1509,1511,1513,1515,1517,1519,1521,1523,1525,1527,1529,1531,1533,1535,1537,1539,1541,1543,1545],{"class":755,"line":880},[703,1508,1400],{"class":809},[703,1510,898],{"class":805},[703,1512,1405],{"class":850},[703,1514,853],{"class":809},[703,1516,1249],{"class":850},[703,1518,853],{"class":809},[703,1520,1131],{"class":805},[703,1522,1304],{"class":862},[703,1524,866],{"class":805},[703,1526,1139],{"class":809},[703,1528,1022],{"class":850},[703,1530,853],{"class":809},[703,1532,1131],{"class":805},[703,1534,1134],{"class":862},[703,1536,866],{"class":805},[703,1538,1321],{"class":809},[703,1540,1010],{"class":805},[703,1542,1326],{"class":809},[703,1544,1010],{"class":805},[703,1546,1440],{"class":809},[744,1548,1550],{"className":791,"code":1549,"filename":300,"language":794,"meta":750,"style":750},"import { initLogger } from 'evlog'\nimport { createSignals } from '@evlog\u002Fsignals'\nimport { fault } from '.\u002Fsignals'\n\ninitLogger({ plugins: [createSignals({ signals: [fault] })] })\n",[614,1551,1552,1570,1588,1606,1610],{"__ignoreMap":750},[703,1553,1554,1556,1558,1560,1562,1564,1566,1568],{"class":755,"line":756},[703,1555,802],{"class":801},[703,1557,806],{"class":805},[703,1559,1240],{"class":809},[703,1561,813],{"class":805},[703,1563,816],{"class":801},[703,1565,819],{"class":805},[703,1567,1249],{"class":763},[703,1569,824],{"class":805},[703,1571,1572,1574,1576,1578,1580,1582,1584,1586],{"class":755,"line":827},[703,1573,802],{"class":801},[703,1575,806],{"class":805},[703,1577,1055],{"class":809},[703,1579,813],{"class":805},[703,1581,816],{"class":801},[703,1583,819],{"class":805},[703,1585,616],{"class":763},[703,1587,824],{"class":805},[703,1589,1590,1592,1594,1596,1598,1600,1602,1604],{"class":755,"line":834},[703,1591,802],{"class":801},[703,1593,806],{"class":805},[703,1595,1074],{"class":809},[703,1597,813],{"class":805},[703,1599,816],{"class":801},[703,1601,819],{"class":805},[703,1603,1286],{"class":763},[703,1605,824],{"class":805},[703,1607,1608],{"class":755,"line":859},[703,1609,831],{"emptyLinePlaceholder":830},[703,1611,1612,1614,1616,1618,1620,1622,1624,1626,1628,1630,1632,1634,1636,1638,1640,1642],{"class":755,"line":880},[703,1613,1297],{"class":850},[703,1615,853],{"class":809},[703,1617,1131],{"class":805},[703,1619,1304],{"class":862},[703,1621,866],{"class":805},[703,1623,1139],{"class":809},[703,1625,1022],{"class":850},[703,1627,853],{"class":809},[703,1629,1131],{"class":805},[703,1631,1134],{"class":862},[703,1633,866],{"class":805},[703,1635,1321],{"class":809},[703,1637,1010],{"class":805},[703,1639,1326],{"class":809},[703,1641,1010],{"class":805},[703,1643,1013],{"class":809},[739,1645,1647],{"id":1646},"read-the-column","Read the column",[608,1649,1650],{},"The next 500 that reaches your drain carries the answer:",[744,1652,1657],{"className":1653,"code":1654,"filename":1655,"language":1656,"meta":750,"style":750},"language-json shiki shiki-themes material-theme-lighter material-theme material-theme-palenight","{\n  \"method\": \"POST\",\n  \"path\": \"\u002Fapi\u002Fcheckout\",\n  \"status\": 502,\n  \"error\": { \"name\": \"FetchError\", \"message\": \"request to https:\u002F\u002Fapi.stripe.com\u002F... failed, reason: read ECONNRESET\" },\n  \"signals\": {\n    \"fault\": { \"value\": \"upstream\", \"confidence\": 0.93 }\n  }\n}\n","Wide Event","json",[614,1658,1659,1663,1686,1706,1722,1771,1784,1830,1835],{"__ignoreMap":750},[703,1660,1661],{"class":755,"line":756},[703,1662,856],{"class":805},[703,1664,1665,1668,1671,1674,1676,1679,1682,1684],{"class":755,"line":827},[703,1666,1667],{"class":805},"  \"",[703,1669,1670],{"class":840},"method",[703,1672,1673],{"class":805},"\"",[703,1675,866],{"class":805},[703,1677,1678],{"class":805}," \"",[703,1680,1681],{"class":763},"POST",[703,1683,1673],{"class":805},[703,1685,877],{"class":805},[703,1687,1688,1690,1693,1695,1697,1699,1702,1704],{"class":755,"line":834},[703,1689,1667],{"class":805},[703,1691,1692],{"class":840},"path",[703,1694,1673],{"class":805},[703,1696,866],{"class":805},[703,1698,1678],{"class":805},[703,1700,1701],{"class":763},"\u002Fapi\u002Fcheckout",[703,1703,1673],{"class":805},[703,1705,877],{"class":805},[703,1707,1708,1710,1713,1715,1717,1720],{"class":755,"line":859},[703,1709,1667],{"class":805},[703,1711,1712],{"class":840},"status",[703,1714,1673],{"class":805},[703,1716,866],{"class":805},[703,1718,1719],{"class":907}," 502",[703,1721,877],{"class":805},[703,1723,1724,1726,1729,1731,1733,1735,1737,1739,1741,1743,1745,1748,1750,1752,1754,1757,1759,1761,1763,1766,1768],{"class":755,"line":880},[703,1725,1667],{"class":805},[703,1727,1728],{"class":840},"error",[703,1730,1673],{"class":805},[703,1732,866],{"class":805},[703,1734,806],{"class":805},[703,1736,1678],{"class":805},[703,1738,720],{"class":759},[703,1740,1673],{"class":805},[703,1742,866],{"class":805},[703,1744,1678],{"class":805},[703,1746,1747],{"class":763},"FetchError",[703,1749,1673],{"class":805},[703,1751,1175],{"class":805},[703,1753,1678],{"class":805},[703,1755,1756],{"class":759},"message",[703,1758,1673],{"class":805},[703,1760,866],{"class":805},[703,1762,1678],{"class":805},[703,1764,1765],{"class":763},"request to https:\u002F\u002Fapi.stripe.com\u002F... failed, reason: read ECONNRESET",[703,1767,1673],{"class":805},[703,1769,1770],{"class":805}," },\n",[703,1772,1773,1775,1778,1780,1782],{"class":755,"line":922},[703,1774,1667],{"class":805},[703,1776,1777],{"class":840},"signals",[703,1779,1673],{"class":805},[703,1781,866],{"class":805},[703,1783,947],{"class":805},[703,1785,1786,1789,1791,1793,1795,1797,1799,1802,1804,1806,1808,1811,1813,1815,1817,1820,1822,1824,1827],{"class":755,"line":939},[703,1787,1788],{"class":805},"    \"",[703,1790,871],{"class":759},[703,1792,1673],{"class":805},[703,1794,866],{"class":805},[703,1796,806],{"class":805},[703,1798,1678],{"class":805},[703,1800,1801],{"class":907},"value",[703,1803,1673],{"class":805},[703,1805,866],{"class":805},[703,1807,1678],{"class":805},[703,1809,1810],{"class":763},"upstream",[703,1812,1673],{"class":805},[703,1814,1175],{"class":805},[703,1816,1678],{"class":805},[703,1818,1819],{"class":907},"confidence",[703,1821,1673],{"class":805},[703,1823,866],{"class":805},[703,1825,1826],{"class":907}," 0.93",[703,1828,1829],{"class":805}," }\n",[703,1831,1832],{"class":755,"line":950},[703,1833,1834],{"class":805},"  }\n",[703,1836,1837],{"class":755,"line":967},[703,1838,1839],{"class":805},"}\n",[608,1841,1842,1844,1845,1847,1848,898],{},[614,1843,1801],{}," is the answer, ",[614,1846,1819],{}," is its probability (always on a yes\u002Fno, on choice and score when the model returns a distribution). Columns are written before the console line, so they show in the dev terminal, in platform logs such as Vercel, and in every ",[679,1849,1850],{"href":153},"drain",[619,1852,1854],{"id":1853},"then-keep-what-sampling-drops","Then keep what sampling drops",[608,1856,1857,1858,1860,1861,1864,1865,1868],{},"Add ",[614,1859,670],{}," to a signal and a ",[614,1862,1863],{},"true"," verdict forces the event past sampling. Six requests on a production rule, ",[614,1866,1867],{},"info"," kept at 0%: sampling keeps the two errors, and three of the four 200s come back because a signal said so:",[1870,1871],"signals-judge",{},[608,1873,1874],{},"This is the signal that rescued the silent checkout:",[744,1876,1878],{"className":791,"code":1877,"filename":793,"language":794,"meta":750,"style":750},"export const silentFailure = defineSignal({\n  name: 'silent-failure',\n  when: e => e.status === 200 && e.path === '\u002Fapi\u002Fcheckout',\n  ask: 'Returned 200, but the customer did not get what they came for',\n  keep: v => v.value && v.confidence > 0.8,\n})\n",[614,1879,1880,1897,1912,1954,1969,2006],{"__ignoreMap":750},[703,1881,1882,1884,1886,1889,1891,1893,1895],{"class":755,"line":756},[703,1883,837],{"class":801},[703,1885,841],{"class":840},[703,1887,1888],{"class":809}," silentFailure ",[703,1890,847],{"class":805},[703,1892,810],{"class":850},[703,1894,853],{"class":809},[703,1896,856],{"class":805},[703,1898,1899,1901,1903,1905,1908,1910],{"class":755,"line":827},[703,1900,863],{"class":862},[703,1902,866],{"class":805},[703,1904,819],{"class":805},[703,1906,1907],{"class":763},"silent-failure",[703,1909,874],{"class":805},[703,1911,877],{"class":805},[703,1913,1914,1916,1918,1920,1922,1924,1926,1928,1931,1934,1937,1939,1941,1944,1946,1948,1950,1952],{"class":755,"line":834},[703,1915,883],{"class":850},[703,1917,866],{"class":805},[703,1919,889],{"class":888},[703,1921,892],{"class":840},[703,1923,889],{"class":809},[703,1925,898],{"class":805},[703,1927,901],{"class":809},[703,1929,1930],{"class":805},"===",[703,1932,1933],{"class":907}," 200",[703,1935,1936],{"class":805}," &&",[703,1938,889],{"class":809},[703,1940,898],{"class":805},[703,1942,1943],{"class":809},"path ",[703,1945,1930],{"class":805},[703,1947,819],{"class":805},[703,1949,1701],{"class":763},[703,1951,874],{"class":805},[703,1953,877],{"class":805},[703,1955,1956,1958,1960,1962,1965,1967],{"class":755,"line":859},[703,1957,925],{"class":862},[703,1959,866],{"class":805},[703,1961,819],{"class":805},[703,1963,1964],{"class":763},"Returned 200, but the customer did not get what they came for",[703,1966,874],{"class":805},[703,1968,877],{"class":805},[703,1970,1971,1974,1976,1979,1981,1983,1985,1988,1991,1993,1995,1998,2001,2004],{"class":755,"line":880},[703,1972,1973],{"class":850},"  keep",[703,1975,866],{"class":805},[703,1977,1978],{"class":888}," v",[703,1980,892],{"class":840},[703,1982,1978],{"class":809},[703,1984,898],{"class":805},[703,1986,1987],{"class":809},"value ",[703,1989,1990],{"class":805},"&&",[703,1992,1978],{"class":809},[703,1994,898],{"class":805},[703,1996,1997],{"class":809},"confidence ",[703,1999,2000],{"class":805},">",[703,2002,2003],{"class":907}," 0.8",[703,2005,877],{"class":805},[703,2007,2008,2010],{"class":755,"line":922},[703,2009,1010],{"class":805},[703,2011,1013],{"class":809},[608,2013,2014,2016,2017,2020,2021,2024],{},[614,2015,670],{}," only promotes. It never drops an event a ",[679,2018,2019],{"href":67},"sampling rule"," would have kept, and the promoted event carries ",[614,2022,2023],{},"kept: true"," on the column so your counts stay honest.",[619,2026,2028],{"id":2027},"where-to-next","Where to next",[2030,2031,2032,2036,2039,2053],"card-group",{},[2033,2034,2035],"card",{"icon":466,"title":463,"to":464},"Yes\u002Fno, pick one, or a rubric. Which shape gives you which column, and how to write a question the model can actually answer.",[2033,2037,2038],{"icon":471,"title":468,"to":469},"Price per event, the rate limit that binds first, latency on the keep path, and what leaves your process.",[2033,2040,2041,2042,2045,2046,2048,2049,2052],{"icon":84,"title":436,"to":473},"Every option of ",[614,2043,2044],{},"defineSignal"," and ",[614,2047,1022],{},", the column format, ",[614,2050,2051],{},"stats()",", and the test helpers, on one page.",[2033,2054,2055],{"icon":478,"title":415,"to":476},"Three signals most apps want on day one, and nine more to copy from.",[2057,2058,2059],"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);}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 .spNyl, html code.shiki .spNyl{--shiki-light:#9C3EDA;--shiki-default:#C792EA;--shiki-dark:#C792EA}html pre.shiki code .s2Zo4, html code.shiki .s2Zo4{--shiki-light:#6182B8;--shiki-default:#82AAFF;--shiki-dark:#82AAFF}html pre.shiki code .swJcz, html code.shiki .swJcz{--shiki-light:#E53935;--shiki-default:#F07178;--shiki-dark:#F07178}html pre.shiki code .sHdIc, html code.shiki .sHdIc{--shiki-light:#90A4AE;--shiki-light-font-style:italic;--shiki-default:#EEFFFF;--shiki-default-font-style:italic;--shiki-dark:#BABED8;--shiki-dark-font-style:italic}html pre.shiki code .sbssI, html code.shiki .sbssI{--shiki-light:#F76D47;--shiki-default:#F78C6C;--shiki-dark:#F78C6C}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}",{"title":750,"searchDepth":827,"depth":827,"links":2061},[2062,2063,2069,2070],{"id":621,"depth":827,"text":622},{"id":684,"depth":827,"text":685,"children":2064},[2065,2066,2067,2068],{"id":741,"depth":834,"text":742},{"id":784,"depth":834,"text":785},{"id":1016,"depth":834,"text":1017},{"id":1646,"depth":834,"text":1647},{"id":1853,"depth":827,"text":1854},{"id":2027,"depth":827,"text":2028},"Ask a model one question about each request and get the answer back as a column: who broke it, is it worth paging, did the customer get what they came for.","md",[2074,2077,2078],{"label":463,"icon":466,"to":464,"color":2075,"variant":2076},"neutral","subtle",{"label":468,"icon":471,"to":469,"color":2075,"variant":2076},{"label":436,"icon":84,"to":473,"color":2075,"variant":2076},{},{"title":41,"icon":44},{"title":454,"description":2071},"8hTCRMArHeJ1ZamFRZl2j5AYq-afsWuC5sukWl2Jf-k",[2084,2086],{"title":450,"path":451,"stem":452,"description":2085,"icon":434,"children":-1},"Build a Node.js HTTP handler with structured request logs, explicit outcomes, error context, and a JSON event you can query.",{"title":463,"path":464,"stem":465,"description":2087,"icon":466,"children":-1},"Three question shapes, each with the column it produces: a yes\u002Fno with a probability, one option out of a list, or a position on a rubric.",1791034604121]