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chore(webapp): reduce telemetry ingestion log volume #3832

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Merged
ericallam merged 1 commit into from
Jun 4, 2026
+21 −6
Merged

chore(webapp): reduce telemetry ingestion log volume #3832

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6 changes: 6 additions & 0 deletions .server-changes/reduce-otel-ingestion-log-volume.md
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Original file line number Diff line number Diff line change
@@ -0,0 +1,6 @@
---
area: webapp
type: improvement
---

Move per-batch ClickHouse event-insert logs to the debug level to cut default log volume, and add an `HTTP_ACCESS_LOG_DISABLED` env var that suppresses successful (2xx) HTTP access logs while still logging errors.
2 changes: 1 addition & 1 deletion apps/webapp/app/eventLoopMonitor.server.ts
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Expand Up @@ -124,7 +124,7 @@ function startEventLoopUtilizationMonitoring() {
const utilization = Number.isFinite(diff.utilization) ? diff.utilization : 0;

if (Math.random() < env.EVENT_LOOP_MONITOR_UTILIZATION_SAMPLE_RATE) {
logger.info("nodejs.event_loop.utilization", { utilization });
logger.debug("nodejs.event_loop.utilization", { utilization });
}

lastEventLoopUtilization = currentEventLoopUtilization;
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2 changes: 1 addition & 1 deletion apps/webapp/app/v3/dynamicFlushScheduler.server.ts
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Expand Up @@ -310,7 +310,7 @@ export class DynamicFlushScheduler<T> {
if (newConcurrency !== currentConcurrency) {
this.limiter = pLimit(newConcurrency);

this.logger.info("Adjusted flush concurrency", {
this.logger.debug("Adjusted flush concurrency", {
previousConcurrency: currentConcurrency,
newConcurrency,
queuePressure,
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6 changes: 3 additions & 3 deletions apps/webapp/app/v3/eventRepository/clickhouseEventRepository.server.ts
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Expand Up @@ -269,7 +269,7 @@ export class ClickhouseEventRepository implements IEventRepository {
return;
}

logger.info("ClickhouseEventRepository.flushBatch Inserted batch into clickhouse", {
logger.debug("ClickhouseEventRepository.flushBatch Inserted batch into clickhouse", {
events: events.length,
insertResult: outcome.insertResult,
sanitized: outcome.kind === "sanitized",
Expand Down Expand Up @@ -302,7 +302,7 @@ export class ClickhouseEventRepository implements IEventRepository {
return;
}

logger.info("ClickhouseEventRepository.flushLlmMetricsBatch Inserted LLM metrics batch", {
logger.debug("ClickhouseEventRepository.flushLlmMetricsBatch Inserted LLM metrics batch", {
rows: rows.length,
sanitized: outcome.kind === "sanitized",
});
Expand Down Expand Up @@ -421,7 +421,7 @@ export class ClickhouseEventRepository implements IEventRepository {
throw insertError;
}

logger.info("ClickhouseEventRepository.flushOtelMetricsBatch Inserted OTLP metrics batch", {
logger.debug("ClickhouseEventRepository.flushOtelMetricsBatch Inserted OTLP metrics batch", {
rows: rows.length,
});
});
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11 changes: 10 additions & 1 deletion apps/webapp/server.ts
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Expand Up @@ -108,7 +108,16 @@ if (ENABLE_CLUSTER && cluster.isPrimary) {
// more aggressive with this caching.
app.use(express.static("public", { maxAge: "1h" }));

app.use(morgan("tiny"));
// On high-volume machine-ingest services (e.g. otel) the per-request access
// log dominates log volume. HTTP_ACCESS_LOG_DISABLED suppresses successful
// (2xx) access logs; non-2xx responses are always logged so errors stay visible.
const suppressSuccessfulAccessLogs = process.env.HTTP_ACCESS_LOG_DISABLED === "1";
app.use(
morgan("tiny", {
skip: (_req, res) =>
suppressSuccessfulAccessLogs && res.statusCode >= 200 && res.statusCode < 300,
})
);

process.title = ENABLE_CLUSTER
? `node webapp-worker-${cluster.isWorker ? cluster.worker?.id : "solo"}`
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