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This page measures the difference and lets you price it against your own traffic.",[595,596,598],"h2",{"id":597},"try-it-against-your-numbers","Try it against your numbers",[600,601],"log-cost-calculator",{},[595,603,605],{"id":604},"where-the-byte-counts-come-from","Where the byte counts come from",[588,607,608,609,612],{},"Both shapes are the checkout request documented on ",[610,611,383],"a",{"href":531},", serialized through the real libraries rather than estimated.",[614,615,616,884],"code-group",{},[617,618,624],"pre",{"className":619,"code":620,"filename":621,"language":622,"meta":623,"style":623},"language-typescript shiki shiki-themes material-theme-lighter material-theme material-theme-palenight","const log = createLogger({ method: 'POST', path: '\u002Fapi\u002Fcheckout', requestId: 'req_abc' })\nlog.set({ user: { id: 'usr_123', plan: 'pro' } })\nlog.set({ cart: { items: 3, total: 9999 } })\nlog.set({ payment: { method: 'card', last4: '4242' } })\nlog.emit({ status: 200 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",[625,1196,1197],{},"level",", ",[625,1200,1201],{},"time",[625,1203,1204],{},"pid",[625,1206,1207],{},"hostname",[625,1209,1210],{},"method",[625,1212,1213],{},"path",", and ",[625,1216,1217],{},"requestId"," are written four times by pino and once by evlog, and the four ",[625,1220,1221],{},"msg"," strings disappear entirely. The fields you actually set are written once either way.",[1224,1225,1228,1229,1232],"callout",{"color":1226,"icon":1227},"warning","i-lucide-alert-triangle","Your ratio is not this ratio. A handler that logs two lines saves less; one that repeats a large ",[625,1230,1231],{},"user"," object on every line saves more. The method transfers, the number does not.",[595,1234,1236],{"id":1235},"which-number-moves-your-bill","Which number moves your bill",[588,1238,1239],{},"Providers meter logs in one of two ways, and that decides which saving you actually collect.",[1132,1241,1242,1255],{},[1135,1243,1244],{},[1138,1245,1246,1249,1252],{},[1141,1247,1248],{},"Metered by",[1141,1250,1251],{},"Saving you collect",[1141,1253,1254],{},"Providers",[1151,1256,1257,1272],{},[1138,1258,1259,1262,1269],{},[1156,1260,1261],{},"Gigabytes ingested",[1156,1263,1264,1265,1268],{},"The ",[1184,1266,1267],{},"56%"," byte figure",[1156,1270,1271],{},"Grafana Cloud, Sentry, PostHog, Better Stack, Axiom",[1138,1273,1274,1281,1287],{},[1156,1275,1276,1277,1280],{},"Gigabytes ",[1184,1278,1279],{},"and"," indexed events",[1156,1282,1264,1283,1286],{},[1184,1284,1285],{},"75%"," event figure, on the line item that usually dominates",[1156,1288,181],{},[588,1290,1291],{},"Per-gigabyte billing is the common case, so most teams collect the byte saving. Datadog is the outlier worth checking: it bills ingestion per gigabyte and indexing per million events, and at production volumes the indexing line is the larger of the two, so the event count is what moves.",[588,1293,1294],{},"Rates were read on 14 August 2026 and are list prices, before free tiers, committed-use discounts, and retention add-ons. They are inputs in the calculator above for exactly that reason.",[595,1296,1298],{"id":1297},"sampling-moves-both-columns","Sampling moves both columns",[588,1300,1301],{},"The calculator applies sampling to both shapes, which is the only fair way to model it. Dropping events is not something evlog does and other loggers cannot: you can filter by level in any logger, or sample in the transport. Applying it to one side only would flatter evlog with a saving that is not evlog's. Pull the slider down and both bills fall together while the gap between them holds.",[588,1303,1304,1305,1307],{},"It is still the larger lever. Consolidation is bounded, because you cannot send fewer than one event per request. ",[610,1306,66],{"href":67}," is not: head sampling drops events by level at emit time, and tail sampling force-keeps the ones you would have wanted, so errors and slow requests survive a rule that discards the rest. Volume stops tracking traffic and starts tracking signal, which is the only version of this that keeps working as you grow.",[588,1309,1310],{},"What evlog changes is the unit sampling operates on. Dropping a line loses part of a request; dropping an event loses a whole one, and keeping an event keeps all of it.",[595,1312,1314],{"id":1313},"ask-it-from-your-editor","Ask it from your editor",[588,1316,1317,1318,1321],{},"The same calculation is an MCP tool on this site's server, so an assistant connected to ",[625,1319,1320],{},"https:\u002F\u002Fevlog.dev\u002Fmcp"," can answer it directly:",[617,1323,1328],{"className":1324,"code":1326,"language":1327},[1325],"language-text","estimate-log-cost({ requestsPerMonth: 10000000, linesPerRequest: 4, provider: \"datadog\" })\n","text",[625,1329,1326],{"__ignoreMap":623},[588,1331,1332,1333,1336,1337,1340],{},"It returns both shapes, the saving, and the basis it used: the measured byte counts, which rates it applied, and the date those rates were read. Pass ",[625,1334,1335],{},"perGb"," and ",[625,1338,1339],{},"perMillionIndexed"," to price a provider that is not in the list, or to correct one whose pricing has moved.",[595,1342,1344],{"id":1343},"next","Next",[1346,1347,1348,1354,1359],"ul",{},[1349,1350,1351,1353],"li",{},[610,1352,66],{"href":67},": the two tiers, and what each one costs you in visibility",[1349,1355,1356,1358],{},[610,1357,383],{"href":531},": the benchmarks these byte counts come from",[1349,1360,1361,1364],{},[610,1362,1363],{"href":153},"Drain adapters",": every destination, and how to change your mind later",[1366,1367,1368],"style",{},"html pre.shiki code .spNyl, html code.shiki .spNyl{--shiki-light:#9C3EDA;--shiki-default:#C792EA;--shiki-dark:#C792EA}html pre.shiki code .sTEyZ, html code.shiki .sTEyZ{--shiki-light:#90A4AE;--shiki-default:#EEFFFF;--shiki-dark:#BABED8}html pre.shiki code .sMK4o, html code.shiki .sMK4o{--shiki-light:#39ADB5;--shiki-default:#89DDFF;--shiki-dark:#89DDFF}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 .sfazB, html code.shiki .sfazB{--shiki-light:#91B859;--shiki-default:#C3E88D;--shiki-dark:#C3E88D}html pre.shiki code .sbssI, html code.shiki .sbssI{--shiki-light:#F76D47;--shiki-default:#F78C6C;--shiki-dark:#F78C6C}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":623,"searchDepth":708,"depth":708,"links":1370},[1371,1372,1373,1374,1375,1376],{"id":597,"depth":708,"text":598},{"id":604,"depth":708,"text":605},{"id":1235,"depth":708,"text":1236},{"id":1297,"depth":708,"text":1298},{"id":1313,"depth":708,"text":1314},{"id":1343,"depth":708,"text":1344},"One request leaves one event instead of four lines: 56% fewer bytes, 75% fewer events. Which number moves your bill depends on your provider.","md",[1380,1383],{"label":383,"icon":112,"to":531,"color":1381,"variant":1382},"neutral","subtle",{"label":66,"icon":69,"to":67,"color":1381,"variant":1382},{},{"title":552,"icon":555},{"title":583,"description":1377},"w2zIB3Tb0pcig-UrCNo5CGO0unYGjQpcMHLEkXmcDI8",[1389,1391],{"title":548,"path":549,"stem":550,"description":1390,"icon":443,"children":-1},"AI-assisted code review and evlog adoption using Agent Skills. Let AI review your logging patterns and guide migration to wide events.",{"title":562,"path":563,"stem":564,"description":1392,"icon":546,"children":-1},"Compare request context, serializers, transports, and migration costs before moving a Pino application to evlog.",1789074366408]