Releases

OTel Collector v0.154.0 fixes a startup crash in exporterhelper and changes --skip-get-modules behavior. Two minor enhancements add TLS and CORS config options.

• securityinclude_insecure_cipher_suites is opt-in — keep it that way

  The new configtls option lets you re-enable weak cipher suites, but they stay disabled by default. Do not set include_insecure_cipher_suites: true in production unless you're forced to by a legacy peer — and if you are, treat it as a temporary workaround and track it.

• breakingCheck custom build pipelines using --skip-get-modules

  If your OCB-based build scripts pass --skip-get-modules expecting go.mod to be regenerated as a side effect, that no longer happens. Audit any CI pipelines that relied on this implicit behavior and add an explicit go mod tidy step if needed.

• enhancementUpgrade if you use sending_queue with sizer enabled

  The nil-pointer panic fix in exporterhelper is critical for anyone who sets sending_queue.sizer alongside batch.enabled: false. If your collector was crashing on startup in this config, v0.154.0 resolves it — upgrade directly.

v0.153.0 stabilizes seven feature gates (breaking), fixes a critical memory corruption bug in gRPC Snappy compression, and ships several mdatagen enhancements for component authors.

• securityUpgrade immediately if you use gRPC with Snappy compression

  The Snappy fix in configgrpc addresses memory corruption that can cause fatal errors — this is a process-crash-level issue, not just a performance concern. If your exporters or receivers use gRPC with Snappy compression enabled, treat this as a priority upgrade. Check your exporter configs for compression: snappy settings.

• breakingAudit your feature gate overrides before upgrading

  All seven stabilized gates are now permanent behavior — you can no longer toggle them. If your collector config or startup flags reference configoptional.AddEnabledField, confmap.newExpandedValueSanitizer, exporter.PersistRequestContext, otelcol.printInitialConfig, pdata.useCustomProtoEncoding, telemetry.UseLocalHostAsDefaultMetricsAddress, or pdata.enableRefCounting, remove those references or the collector will fail to start. The metrics address change (UseLocalHostAsDefaultMetricsAddress) is the one most likely to surprise teams — your metrics endpoint is now localhost-bound by default.

• breakingmdatagen reaggregation config is now on by default

  If you maintain custom collector components using mdatagen, the reaggregation config fields are now generated by default. To preserve the old behavior (metrics config with only the enabled field), explicitly set reaggregation_enabled: false in your metadata.yaml. Run mdatagen on your components after upgrading and review the generated output before committing.

v0.152.1 is a bug-fix-heavy release with one useful new metric. The most operationally impactful changes are snappy decompression security fixes and a Prometheus metric naming regression fix.

• securityconfighttp snappy fixes limit memory exposure from compressed payloads

  Three snappy decompression fixes land in `pkg/confighttp`: body is now closed after reading, panics in decompression libraries return HTTP 400 instead of crashing with 500, and `max_request_body_size` is enforced before the decoded buffer is allocated. The size-check fix in particular prevents a potential memory spike from a maliciously crafted compressed payload. If you accept compressed OTLP over HTTP from untrusted sources, upgrade.

• breakingPrometheus metric name format may change if you customized telemetry host

  If you explicitly set the `host` field in the telemetry metrics section of your collector config, check whether your Prometheus metric names changed after upgrading to recent versions. The bug caused `WithoutScopeInfo`, `WithoutUnits`, and `WithoutTypeSuffix` to default to false instead of true in that code path, which means your metrics may have had unexpected suffixes or scope labels. This release restores the correct defaults — metric names may shift again on upgrade, so update dashboards and alerts accordingly.

• enhancementAdd in-flight exporter metric to your dashboards

  The new `otelcol_exporter_in_flight_requests` UpDownCounter metric is available in `pkg/exporterhelper`. Add it to your dashboards to see when exporters are queuing up requests or saturating worker pools — it's a direct signal of export backpressure that was previously hard to observe without custom instrumentation.

v0.150.0 is a maintenance release with targeted bug fixes: corrects the print-config unredacted output, redacts internal telemetry OTLP headers in marshaled config, and fixes a bounds-check crash in the debug exporter.

• securityTelemetry exporter headers now redacted in marshaled config

  Internal telemetry OTLP exporter headers are now redacted when configuration is marshaled. If you log or store marshaled config output anywhere, headers (which may contain auth tokens) were previously exposed in plaintext. Upgrade and audit any stored config snapshots.

• enhancementFix print-config unredacted mode to show defaults

  The print-config command's unredacted mode previously dropped all default-valued options from output. Fixed by introducing confmap.WithUnredacted MarshalOption. If your team uses print-config for auditing or debugging configuration, re-run it after upgrading — the output is now complete and trustworthy.