We are happy to release KEDA 2.5.0 🎉

Here are some highlights:

• Introducing a new Cassandra scaler
• Introducing a new Elasticsearch scaler
• Introducing a new Graphite scaler
• GCP PubSub Scaler: subscriptionSize is deprecated in favor of mode and value
• Performance improvements
• Lot of improvements in several scalers

Learn how to deploy KEDA by reading our documentation.

New

• Add Cassandra Scaler (#2211)
• Add Elasticsearch Scaler (#2311)
• Add Graphite Scaler (#1628)
• ScaledJob: introduce MultipleScalersCalculation (#2016)
• ScaledJob: introduce RolloutStrategy (#2164)
• Add ScalersCache to reuse scalers unless they need changing (#2187)
• Cache metric names provided by KEDA Metrics Server (#2279)

Improvements

• Artemis Scaler: parse out broker config parameters in case restAPITemplate is given (#2104)
• AWS Cloudwatch Scaler: improve metric exporting logic (#2243)
• AWS Cloudwatch Scaler: return minimum value for the metric when cloudwatch returns empty list (#2345)
• Azure Log Analytics Scaler: add support to provide the metric name(#2106)
• Azure Pipelines Scaler: improve logs (#2297)
• Cron Scaler: improve validation in case start & end input is same (#2032)
• Cron Scaler: improve the cron validation (#2038)
• GCP PubSub Scaler: introduce SubscriptionSize and OldestUnackedMessageAge modes (#2266)
• GCP PubSub Scaler: add GCP identity authentication when using (#2225)
• GCP PubSub Scaler: add possibility to reference a GCP PubSub subscription by full link, including project ID (#2269)
• InfluxDB Scaler: add unsafeSsl parameter (#2157|#2320)
• Metrics API Scaler: add Bearer auth (#2028)
• MongoDB Scaler: add support to get connection data from Trigger Authorization (#2115)
• MSSQL Scaler: add support to get connection data from Trigger Authorization (#2112)
• MySQL Scaler: add support to get connection data from Trigger Authorization (#2113)
• MySQL Scaler: don't expose connection string in metricName (#2171)
• PostgreSQL Scaler: add support to get connection data from Trigger Authorization (#2114)
• Prometheus Scaler: validating values length in Prometheus query response (#2264)
• Prometheus Scaler: omit serverAddress from generated metric name (#2099)
• RabbitMQ Scaler: anonymize the host in case of HTTP failure (#2041)
• RabbitMQ Scaler: escape queueName and vhostName before use them in query string (bug fix) (#2055)
• RabbitMQ Scaler: add custom http timeout (#2086)
• RabbitMQ Scaler: add pageSize (using regex) (#2162|#2319)
• Redis Scaler: upgrade library, add username and Sentinel support (#2181)
• SeleniumGrid Scaler: add unsafeSsl parameter (#2157)
• Stan Scaler: provide support for configuring authentication through TriggerAuthentication (#2167)
• Allow setting MaxConcurrentReconciles for controllers (#2272)
• Cleanup metric names inside scalers (#2260)
• Drop support to ValueMetricType using cpu_memory_scaler (#2218)
• Improve metric name creation to be unique using scaler index inside the scaler (#2161)
• Improve error message if IdleReplicaCount are equal to MinReplicaCount to be the same as the check (#2212)
• TriggerAuthentication/Vault: add support for HashiCorp Vault namespace (Vault Enterprise) (#2085)

Deprecations

• GCP PubSub Scaler: subscriptionSize is deprecated in favor of mode and value (#2266)

Breaking Changes

• None

Other

• Ensure that context.Context values are properly passed down the stack (#2202|#2249)
• Refactor AWS related scalers to reuse the AWS clients instead of creating a new one for every GetMetrics call (#2255)
• Improve context handling in appropriate functionality in which we instantiate scalers (#2267)
• Migrate to Kubebuilder v3 (#2082)
  • API path has been changed: github.com/kedacore/keda/v2/api/v1alpha1 -> github.com/kedacore/keda/v2/apis/keda/v1alpha1
• Use Patch to set FallbackCondition on ScaledObject.Status (#2037)
• Bump Golang to 1.17.3 (#2329)
• Add Makefile mockgen targets (#2090|#2184)
• Add github action to run e2e command "on-demand" (#2241)
• Add execution url in the pr-e2e triggering comment and fix problem related with not starting with (#2306)

New Contributors

• @fbalicchia made their first contribution in https://github.com/kedacore/keda/pull/2051
• @chapurlatn made their first contribution in https://github.com/kedacore/keda/pull/2085
• @bpinske made their first contribution in https://github.com/kedacore/keda/pull/2092
• @mihaitodor made their first contribution in https://github.com/kedacore/keda/pull/2137
• @dtsioumas made their first contribution in https://github.com/kedacore/keda/pull/2157
• @Deichindianer made their first contribution in https://github.com/kedacore/keda/pull/2212
• @jerbob92 made their first contribution in https://github.com/kedacore/keda/pull/2181
• @etamarw made their first contribution in https://github.com/kedacore/keda/pull/2164
• @jmalvarezf-lmes made their first contribution in https://github.com/kedacore/keda/pull/2225
• @fivesheep made their first contribution in https://github.com/kedacore/keda/pull/2243
• @sosoftmandruszak made their first contribution in https://github.com/kedacore/keda/pull/2264
• @Friedrich42 made their first contribution in https://github.com/kedacore/keda/pull/2266
• @endersonmenezes made their first contribution in https://github.com/kedacore/keda/pull/2297
• @orphaner made their first contribution in https://github.com/kedacore/keda/pull/2311
• @allupaku made their first contribution in https://github.com/kedacore/keda/pull/2345

Full Changelog: https://github.com/kedacore/keda/compare/v2.4.0...v2.5.0