Prepare Changelog for 0.109.0 release (#5382)

* Prepace Changelog for 0.109.0 release

Co-authored-by: Antoine Toulme <atoulme@splunk.com>

CHANGELOG.md

@@ -2,9 +2,14 @@
 
 ## Unreleased
 
+## v0.109.0
+
 ### 🛑 Breaking changes 🛑
 
 - (Splunk) Update Python to 3.12.5 in the Smart Agent bundle for Linux and Windows. Check [What’s New In Python 3.12](https://docs.python.org/3/whatsnew/3.12.html) for details. ([#5298](https://github.com/signalfx/splunk-otel-collector/pull/5298))
+- (Contrib) `spanmetricsconnector`: Improve consistency between metrics generated by spanmetricsconnector. Added traces.span.metrics as default namespace ([#33227](https://github.com/open-telemetry/opentelemetry-collector-contrib/issues/33227)
+  Default namespace for the generated metrics is traces.span.metrics now. | The deprecated metrics are: calls, duration and events. | The feature flag connector.spanmetrics.legacyLatencyMetricNames was added to revert the behavior.
+- (Contrib) `ottl`: Remove tracing from OTTL due to performance concerns ([#34910](https://github.com/open-telemetry/opentelemetry-collector-contrib/issues/34910)
 
 ### 🚀 New components 🚀
 
@@ -15,6 +20,57 @@
 
 - (Splunk) Apache Web Server Auto Discovery: set the default discovered endpoint to match the OpenTelemetry `apachereceiver` default: `http://`endpoint`/server-status?auto` ([#5353](https://github.com/signalfx/splunk-otel-collector/pull/5353))
   If the collector is running as a process on the host OS and the Apache Web Server is in a Docker container add `--set=splunk.discovery.extensions.docker_observer.config.use_host_bindings=true` to the command-line arguments for the discovery to create the correct endpoint.
+- (Splunk) Introduce continuous service discovery mode. This mode can be enabled with a feature gate by adding `--feature-gates=splunk.continuousDiscovery` command line argument. ([#5363](https://github.com/signalfx/splunk-otel-collector/pull/5363))
+  The new mode does the following:
+  - It allows discovering new services that were not available at the time of the collector startup. If discovery is 
+    successful, the metrics collection will be started.
+  - Information about discovered services is being sent to Splunk Observability Cloud. The information will include 
+    instructions to complete discovery for particular services if the discovery was not successful out of the box.
+- (Core) `service`: move `useOtelWithSDKConfigurationForInternalTelemetry` gate to beta ([#11091](https://github.com/open-telemetry/opentelemetry-collector/issues/11091))
+- (Core) `service`: implement a no-op tracer provider that doesn't propagate the context ([#11026](https://github.com/open-telemetry/opentelemetry-collector/issues/11026))
+  The no-op tracer provider supported by the SDK incurs a memory cost of propagating the context no matter
+  what. This is not needed if tracing is not enabled in the Collector. This implementation of the no-op tracer
+  provider removes the need to allocate memory when tracing is disabled.
+- (Core) `processor`: Add incoming and outgoing counts for processors using processorhelper. ([#10910](https://github.com/open-telemetry/opentelemetry-collector/issues/10910))
+  Any processor using the processorhelper package (this is most processors) will automatically report
+  incoming and outgoing item counts. The new metrics are:
+  - otelcol_processor_incoming_spans
+  - otelcol_processor_outgoing_spans
+  - otelcol_processor_incoming_metric_points
+  - otelcol_processor_outgoing_metric_points
+  - otelcol_processor_incoming_log_records
+  - otelcol_processor_outgoing_log_records
+- (Contrib) `pkg/ottl`: Added Decode() converter function ([#32493](https://github.com/open-telemetry/opentelemetry-collector-contrib/issues/32493)
+- (Contrib) `filestorage`: Add directory validation for compaction on-rebound ([#35114](https://github.com/open-telemetry/opentelemetry-collector-contrib/issues/35114)
+- (Contrib) `windowseventlogreceiver`: Avoid rendering the whole event to obtain the provider name ([#34755](https://github.com/open-telemetry/opentelemetry-collector-contrib/issues/34755)
+- (Contrib) `splunkhecexporter`: Drop empty log events ([#34871](https://github.com/open-telemetry/opentelemetry-collector-contrib/issues/34871)
+  Log records with no body are dropped by Splunk on reception as they contain no log message, albeit they may have attributes.
+  This is in tune with the behavior of splunkhecreceiver, which refuses HEC events with no event ([#19769](https://github.com/open-telemetry/opentelemetry-collector-contrib/issues/19769)
+- (Contrib) `transformprocessor`: Support aggregating metrics based on their attribute values and substituting the values with a new value. ([#16224](https://github.com/open-telemetry/opentelemetry-collector-contrib/issues/16224)
+- (Contrib) `kafkareceiver`: Adds tunable fetch sizes to Kafka Receiver ([#22741](https://github.com/open-telemetry/opentelemetry-collector-contrib/issues/22741)
+  Adds the ability to tune the minumum, default and maximum fetch sizes for the Kafka Receiver
+- (Contrib) `kafkareceiver`: Add support for encoding extensions in the Kafka receiver. ([#33888](https://github.com/open-telemetry/opentelemetry-collector-contrib/issues/33888)
+  This change adds support for encoding extensions in the Kafka receiver. Loading extensions takes precedence over the internally supported encodings.
+- (Contrib) `pkg/ottl`: Add `Sort` function to sort array to ascending order or descending order ([#34200](https://github.com/open-telemetry/opentelemetry-collector-contrib/issues/34200)
+- (Contrib) `redactionprocessor`: Add support for logs and metrics ([#34479](https://github.com/open-telemetry/opentelemetry-collector-contrib/issues/34479)
+- (Contrib) `spanmetricsconnector`: Extract the `getDimensionValue` function as a common function. ([#34627](https://github.com/open-telemetry/opentelemetry-collector-contrib/issues/34627)
+- (Contrib) `sqlqueryreceiver`: Support populating log attributes from sql query ([#24459](https://github.com/open-telemetry/opentelemetry-collector-contrib/issues/24459)
+
+### 🧰 Bug fixes 🧰
+
+- (Core) `configgrpc`: Change the value of max_recv_msg_size_mib from uint64 to int to avoid a case where misconfiguration caused an integer overflow. ([#10948](https://github.com/open-telemetry/opentelemetry-collector/issues/10948))
+- (Core) `exporterqueue`: Fix a bug in persistent queue that Offer can becomes deadlocked when queue is almost full ([#11015](https://github.com/open-telemetry/opentelemetry-collector/issues/11015))
+- (Contrib) `apachereceiver`: Fix panic on invalid endpoint configuration ([#34992](https://github.com/open-telemetry/opentelemetry-collector-contrib/issues/34992)
+- (Contrib) `fileconsumer`: Fix bug where max_concurrent_files could not be set to 1. ([#35080](https://github.com/open-telemetry/opentelemetry-collector-contrib/issues/35080)
+- (Contrib) `hostmetricsreceiver`: In filesystem scraper, do not prefix partitions when using the environment variable HOST_PROC_MOUNTINFO ([#35043](https://github.com/open-telemetry/opentelemetry-collector-contrib/issues/35043)
+- (Contrib) `splunkhecreceiver`: Fix memory leak when the receiver is used for both metrics and logs at the same time ([#34886](https://github.com/open-telemetry/opentelemetry-collector-contrib/issues/34886)
+- (Contrib) `pkg/stanza`: Synchronize shutdown in stanza adapter ([#31074](https://github.com/open-telemetry/opentelemetry-collector-contrib/issues/31074)
+  Stanza-based receivers should now flush all data before shutting down
+- (Contrib) `sqlserverreceiver`: Fix bug where metrics were being emitted with the wrong database name resource attribute ([#35036](https://github.com/open-telemetry/opentelemetry-collector-contrib/issues/35036)
+- (Contrib) `signalfxexporter`: Fix memory leak by re-organizing the exporter's functionality lifecycle ([#32781](https://github.com/open-telemetry/opentelemetry-collector-contrib/issues/32781)
+- (Contrib) `otlpjsonconnector`: Handle OTLPJSON unmarshal error ([#34782](https://github.com/open-telemetry/opentelemetry-collector-contrib/issues/34782)
+- (Contrib) `mysqlreceiver`: mysql client raise error when the TABLE_ROWS column is NULL, convert NULL to int64 ([#34195](https://github.com/open-telemetry/opentelemetry-collector-contrib/issues/34195)
+- (Contrib) `pkg/stanza`: An operator configured with silent errors shouldn't log errors while processing log entries. ([#35008](https://github.com/open-telemetry/opentelemetry-collector-contrib/issues/35008)
 
 ## v0.108.1