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This page measures the difference and lets you price it against your own traffic.",[612,613,615],"h2",{"id":614},"try-it-against-your-numbers","Try it against your numbers",[617,618],"log-cost-calculator",{},[612,620,622],{"id":621},"where-the-byte-counts-come-from","Where the byte counts come from",[605,624,625,626,629],{},"Both shapes are the checkout request documented on ",[627,628,383],"a",{"href":548},", serialized through the real libraries rather than estimated.",[631,632,633,901],"code-group",{},[634,635,641],"pre",{"className":636,"code":637,"filename":638,"language":639,"meta":640,"style":640},"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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",[642,1213,1214],{},"level",", ",[642,1217,1218],{},"time",[642,1220,1221],{},"pid",[642,1223,1224],{},"hostname",[642,1226,1227],{},"method",[642,1229,1230],{},"path",", and ",[642,1233,1234],{},"requestId"," are written four times by pino and once by evlog, and the four ",[642,1237,1238],{},"msg"," strings disappear entirely. The fields you actually set are written once either way.",[1241,1242,1245,1246,1249],"callout",{"color":1243,"icon":1244},"warning","i-lucide-alert-triangle","Your ratio is not this ratio. A handler that logs two lines saves less; one that repeats a large ",[642,1247,1248],{},"user"," object on every line saves more. The method transfers, the number does not.",[612,1251,1253],{"id":1252},"which-number-moves-your-bill","Which number moves your bill",[605,1255,1256],{},"Providers meter logs in one of two ways, and that decides which saving you actually collect.",[1149,1258,1259,1272],{},[1152,1260,1261],{},[1155,1262,1263,1266,1269],{},[1158,1264,1265],{},"Metered by",[1158,1267,1268],{},"Saving you collect",[1158,1270,1271],{},"Providers",[1168,1273,1274,1289],{},[1155,1275,1276,1279,1286],{},[1173,1277,1278],{},"Gigabytes ingested",[1173,1280,1281,1282,1285],{},"The ",[1201,1283,1284],{},"56%"," byte figure",[1173,1287,1288],{},"Grafana Cloud, Sentry, PostHog, Better Stack, Axiom",[1155,1290,1291,1298,1304],{},[1173,1292,1293,1294,1297],{},"Gigabytes ",[1201,1295,1296],{},"and"," indexed events",[1173,1299,1281,1300,1303],{},[1201,1301,1302],{},"75%"," event figure, on the line item that usually dominates",[1173,1305,181],{},[605,1307,1308],{},"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.",[605,1310,1311],{},"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.",[612,1313,1315],{"id":1314},"sampling-moves-both-columns","Sampling moves both columns",[605,1317,1318],{},"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.",[605,1320,1321,1322,1324],{},"It is still the larger lever. Consolidation is bounded, because you cannot send fewer than one event per request. ",[627,1323,66],{"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.",[605,1326,1327],{},"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.",[612,1329,1331],{"id":1330},"ask-it-from-your-editor","Ask it from your editor",[605,1333,1334,1335,1338],{},"The same calculation is an MCP tool on this site's server, so an assistant connected to ",[642,1336,1337],{},"https:\u002F\u002Fevlog.dev\u002Fmcp"," can answer it directly:",[634,1340,1345],{"className":1341,"code":1343,"language":1344},[1342],"language-text","estimate-log-cost({ requestsPerMonth: 10000000, linesPerRequest: 4, provider: \"datadog\" })\n","text",[642,1346,1343],{"__ignoreMap":640},[605,1348,1349,1350,1353,1354,1357],{},"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 ",[642,1351,1352],{},"perGb"," and ",[642,1355,1356],{},"perMillionIndexed"," to price a provider that is not in the list, or to correct one whose pricing has moved.",[612,1359,1361],{"id":1360},"next","Next",[1363,1364,1365,1371,1376],"ul",{},[1366,1367,1368,1370],"li",{},[627,1369,66],{"href":67},": the two tiers, and what each one costs you in visibility",[1366,1372,1373,1375],{},[627,1374,383],{"href":548},": the benchmarks these byte counts come from",[1366,1377,1378,1381],{},[627,1379,1380],{"href":153},"Drain adapters",": every destination, and how to change your mind later",[1383,1384,1385],"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":640,"searchDepth":725,"depth":725,"links":1387},[1388,1389,1390,1391,1392,1393],{"id":614,"depth":725,"text":615},{"id":621,"depth":725,"text":622},{"id":1252,"depth":725,"text":1253},{"id":1314,"depth":725,"text":1315},{"id":1330,"depth":725,"text":1331},{"id":1360,"depth":725,"text":1361},"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",[1397,1400],{"label":383,"icon":112,"to":548,"color":1398,"variant":1399},"neutral","subtle",{"label":66,"icon":69,"to":67,"color":1398,"variant":1399},{},{"title":569,"icon":572},{"title":600,"description":1394},"EdRzz6H7qYHW5sOZZwDE7ZrU2iOsCuQgSdtNb3sBnVw",[1406,1408],{"title":565,"path":566,"stem":567,"description":1407,"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":579,"path":580,"stem":581,"description":1409,"icon":563,"children":-1},"Compare request context, serializers, transports, and migration costs before moving a Pino application to evlog.",1789076902358]