feat(metrics): allow overriding metrics collector configuration

(cherry picked from commit 5dc06a5)

.changelog/3314.added.txt

@@ -0,0 +1 @@
+feat(metrics): allow overriding metrics collector configuration

deploy/helm/sumologic/README.md

@@ -142,6 +142,8 @@ The following table lists the configurable parameters of the Sumo Logic chart an
 | `sumologic.metrics.collector.otelcol.cAdvisor.enabled`                                | Enable collection of cAdvisor metrics.                                                                                                                                                                                                                                                                                                                               | `true`                                                                                                                                                                               |
 | `sumologic.metrics.collector.otelcol.annotatedPods.enabled`                           | Enable collection of metrics from Pods annotated with prometheus.io/\* keys. See [docs/collecting-application-metrics.md](/docs/collecting-application-metrics.md#application-metrics-are-exposed-one-endpoint-scenario) for more information.                                                                                                                       | `true`                                                                                                                                                                               |
 | `sumologic.metrics.collector.otelcol.allocationStrategy`                              | Allocation strategy for the scrape target allocator. Valid values are: least-weighted and consistent-hashing. See: https://github.com/open-telemetry/opentelemetry-operator/blob/main/docs/api.md#opentelemetrycollectorspectargetallocator                                                                                                                          | `least-weighted`                                                                                                                                                                     |
+| `sumologic.metrics.collector.otelcol.config.merge`                                    | Configuration for otelcol metrics collector, merged with defaults. See also https://github.com/SumoLogic/sumologic-otel-collector/blob/main/docs/configuration.md.                                                                                                                                                                                                   | {}                                                                                                                                                                                   |
+| `sumologic.metrics.collector.otelcol.config.override`                                 | Configuration for otelcol metrics collector, replaces defaults. See also https://github.com/SumoLogic/sumologic-otel-collector/blob/main/docs/configuration.md.                                                                                                                                                                                                      | {}                                                                                                                                                                                   |
 | `sumologic.metrics.dropHistogramBuckets`                                              | Drop buckets from select high-cardinality histogram metrics, leaving only the sum and count components.                                                                                                                                                                                                                                                              | `true`                                                                                                                                                                               |
 | `sumologic.metrics.sourceType`                                                        | The type of the Sumo Logic source being used for metrics ingestion. Can be `http` or `otlp`.                                                                                                                                                                                                                                                                         | `http`                                                                                                                                                                               |
 | `sumologic.traces.enabled`                                                            | Set the enabled flag to true to enable tracing ingestion. _Tracing must be enabled for the account first. Please contact your Sumo representative for activation details_                                                                                                                                                                                            | `true`                                                                                                                                                                               |

deploy/helm/sumologic/templates/metrics/collector/otelcol/opentelemetrycollector.yaml

@@ -1,4 +1,13 @@
 {{- if and (eq (include "metrics.otelcol.enabled" .) "true") .Values.sumologic.metrics.collector.otelcol.enabled }}
+{{ $baseConfig := (tpl (.Files.Get "conf/metrics/collector/otelcol/config.yaml") .) | fromYaml }}
+{{ $mergeConfig := .Values.sumologic.metrics.collector.otelcol.config.merge }}
+{{ $overrideConfig := .Values.sumologic.metrics.collector.otelcol.config.override }}
+{{ $finalConfig := "" }}
+{{ if $overrideConfig }}
+{{ $finalConfig = $overrideConfig }}
+{{ else }}
+{{ $finalConfig = mergeOverwrite $baseConfig $mergeConfig }}
+{{ end }}
 apiVersion: opentelemetry.io/v1alpha1
 kind: OpenTelemetryCollector
 metadata:
@@ -98,5 +107,5 @@ spec:
   - name: file-storage
     mountPath: /var/lib/storage/otc
   config: |
-{{- (tpl (.Files.Get "conf/metrics/collector/otelcol/config.yaml") .) | nindent 4 }}
+{{- $finalConfig | toYaml | nindent 4 }}
 {{- end }}

deploy/helm/sumologic/values.yaml

@@ -548,6 +548,25 @@ sumologic:
         ## See: https://github.com/open-telemetry/opentelemetry-operator/blob/main/docs/api.md#opentelemetrycollectorspectargetallocator
         # allocationStrategy: least-weighted
 
+        config:
+          ## Directly alter the OT configuration. The value of this key should be a dictionary, that will
+          ## be directly merged with the generated configuration, overriding existing values.
+          ## For example:
+          # override:
+          #   processors:
+          #     batch:
+          #       send_batch_size: 512
+          ## will change the batch size of the pipeline.
+          ##
+          ## WARNING: This field is not subject to backwards-compatibility guarantees offered by the rest
+          ## of this chart. It involves implementation details that may change even in minor versions.
+          ## Use with caution, and consider opening an issue, so your customization can be added in a safer way.
+          merge: {}
+          ## Completely override existing config and replace it with the contents of this value.
+          ## The value of this key should be a dictionary, that will replace the normal configuration.
+          ## This is an advanced feature, use with caution, and review the generated configuration first.
+          override: {}
+
     ## Default metric filters for Sumo Apps
     enableDefaultFilters: false