docs(changelog): document echo's new pipelineCache.filterFront50Pipel…

…ines flag (#337)

and the front50 changes to support it.

content/en/docs/releases/next-release-preview/index.md

@@ -14,12 +14,18 @@ changelog.
 ### [doNotEval SpEL helper](https://spinnaker.io/changelogs/1.30.0-changelog/#donoteval-spel-helper)
 This feature is now enabled by default
 
+### Echo
+
+https://github.com/spinnaker/echo/pull/1292 adds a new configuration flag: `pipelineCache.filterFront50Pipelines` that defaults to false. When false, echo caches all pipelines front50. When true, it only caches enabled pipelines with enabled triggers of specific types -- the types that echo knows how to trigger, along with some changes to the logic for handling manual executions so they continue to function. This is typically a very small subset of all pipelines.
+
 ### Orca
 
 https://github.com/spinnaker/orca/pull/4448 adds a new configuration flag: `front50.useTriggeredByEndpoint` that defaults to false. When false, orca queries front50 for all pipelines each time a pipeline execution completes. When true, orca only queries for pipelines triggered when a specific pipeline completes which is potentially a very small subset of all pipelines.
 
 ### Front50
 
+https://github.com/spinnaker/front50/pull/1252 adds optional query parameters for enabledPipelines (boolean), enabledTriggers (boolean), and triggerTypes (string) to the GET /pipelines endpoint and a new GET /pipelines/{application:.+}/name/{name:.+} endpoint to get one pipeline by application and name.
+
 https://github.com/spinnaker/front50/pull/1251 adds a new GET /pipelines/triggeredBy/{id:.+}/{status} endpoint.
 
 https://github.com/spinnaker/front50/pull/1249 adds three new configuration flags for [each object type under service-storage](https://github.com/spinnaker/front50/blob/568743732dcb47cc576a178795b6a992923f1d3c/front50-core/src/main/java/com/netflix/spinnaker/front50/config/StorageServiceConfigurationProperties.java#L8).