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same request context over and over. Every line carries its own level, timestamp, host, and request bindings. Four lines, four copies.",[609,613,614],{},"evlog emits one event per request instead, so that context is written once. This page measures the difference and lets you price it against your own traffic.",[616,617,619],"h2",{"id":618},"try-it-against-your-numbers","Try it against your numbers",[621,622],"log-cost-calculator",{},[616,624,626],{"id":625},"where-the-byte-counts-come-from","Where the byte counts come from",[609,628,629,630,633],{},"Both shapes are the checkout request documented on ",[631,632,383],"a",{"href":552},", serialized through the real libraries rather than estimated.",[635,636,637,905],"code-group",{},[638,639,645],"pre",{"className":640,"code":641,"filename":642,"language":643,"meta":644,"style":644},"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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",[646,1217,1218],{},"level",", ",[646,1221,1222],{},"time",[646,1224,1225],{},"pid",[646,1227,1228],{},"hostname",[646,1230,1231],{},"method",[646,1233,1234],{},"path",", and ",[646,1237,1238],{},"requestId"," are written four times by pino and once by evlog, and the four ",[646,1241,1242],{},"msg"," strings disappear entirely. The fields you actually set are written once either way.",[1245,1246,1249,1250,1253],"callout",{"color":1247,"icon":1248},"warning","i-lucide-alert-triangle","Your ratio is not this ratio. A handler that logs two lines saves less; one that repeats a large ",[646,1251,1252],{},"user"," object on every line saves more. The method transfers, the number does not.",[616,1255,1257],{"id":1256},"which-number-moves-your-bill","Which number moves your bill",[609,1259,1260],{},"Providers meter logs in one of two ways, and that decides which saving you actually collect.",[1153,1262,1263,1276],{},[1156,1264,1265],{},[1159,1266,1267,1270,1273],{},[1162,1268,1269],{},"Metered by",[1162,1271,1272],{},"Saving you collect",[1162,1274,1275],{},"Providers",[1172,1277,1278,1293],{},[1159,1279,1280,1283,1290],{},[1177,1281,1282],{},"Gigabytes ingested",[1177,1284,1285,1286,1289],{},"The ",[1205,1287,1288],{},"56%"," byte figure",[1177,1291,1292],{},"Grafana Cloud, Sentry, PostHog, Better Stack, Axiom",[1159,1294,1295,1302,1308],{},[1177,1296,1297,1298,1301],{},"Gigabytes ",[1205,1299,1300],{},"and"," indexed events",[1177,1303,1285,1304,1307],{},[1205,1305,1306],{},"75%"," event figure, on the line item that usually dominates",[1177,1309,181],{},[609,1311,1312],{},"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.",[609,1314,1315],{},"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.",[616,1317,1319],{"id":1318},"sampling-moves-both-columns","Sampling moves both columns",[609,1321,1322],{},"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.",[609,1324,1325,1326,1328],{},"It is still the larger lever. Consolidation is bounded, because you cannot send fewer than one event per request. ",[631,1327,66],{"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.",[609,1330,1331],{},"What evlog changes is the unit sampling operates on. 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Pass ",[646,1355,1356],{},"perGb"," and ",[646,1359,1360],{},"perMillionIndexed"," to price a provider that is not in the list, or to correct one whose pricing has moved.",[616,1363,1365],{"id":1364},"next","Next",[1367,1368,1369,1375,1380],"ul",{},[1370,1371,1372,1374],"li",{},[631,1373,66],{"href":67},": the two tiers, and what each one costs you in visibility",[1370,1376,1377,1379],{},[631,1378,383],{"href":552},": the benchmarks these byte counts come from",[1370,1381,1382,1385],{},[631,1383,1384],{"href":153},"Drain adapters",": every destination, and how to change your mind later",[1387,1388,1389],"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":644,"searchDepth":729,"depth":729,"links":1391},[1392,1393,1394,1395,1396,1397],{"id":618,"depth":729,"text":619},{"id":625,"depth":729,"text":626},{"id":1256,"depth":729,"text":1257},{"id":1318,"depth":729,"text":1319},{"id":1334,"depth":729,"text":1335},{"id":1364,"depth":729,"text":1365},"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",[1401,1404],{"label":383,"icon":112,"to":552,"color":1402,"variant":1403},"neutral","subtle",{"label":66,"icon":69,"to":67,"color":1402,"variant":1403},{},{"title":573,"icon":576},{"title":604,"description":1398},"w2zIB3Tb0pcig-UrCNo5CGO0unYGjQpcMHLEkXmcDI8",[1410,1412],{"title":569,"path":570,"stem":571,"description":1411,"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":583,"path":584,"stem":585,"description":1413,"icon":567,"children":-1},"Compare request context, serializers, transports, and migration costs before moving a Pino application to evlog.",1791058661510]