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Changelog

All notable changes to this project will be documented in this file.

The format is based on Keep a Changelog and this project adheres to Semantic Versioning.

v1.12.0 (2026-03-12)

  • Add logging for all SSM service check outcomes in dangling instance detection #303 (petetomasik)
  • Add a Renovate config #301 (mcncl)
  • chore(deps): bump the aws group across 1 directory with 7 updates #296 (dependabot[bot])
  • Detect dangling instances when agents report zero but instances are running #300 (omehegan)
  • chore: add support to codeowners #299 (CerealBoy)

v1.11.2 (2026-03-09)

  • Bump Go to 1.26.1, and gotestsum to 1.13.0 #295 (scadu)

v1.11.1 (2026-03-04)

Full Changelog

Dependencies

  • chore(deps): bump the aws group across 1 directory with 6 updates #290 (@dependabot[bot]

Internal

  • chore: remove support from codeowners #292 (@mcncl)

v1.11.0 (2026-02-10)

Fixed

Changed

  • Add dangling instance check for Windows by @scadu in buildkite#280

Dependencies

  • chore(deps): bump the aws group with 5 updates by @dependabot[bot] in buildkite#272
  • chore(deps): bump the aws group with 7 updates by @dependabot[bot] in buildkite#273
  • SUP-2919: Add ManagedPolicyARNs to Lambda Scaler by @Mykematt in buildkite#274
  • chore(deps): bump the aws group with 5 updates by @dependabot[bot] in buildkite#275
  • chore(deps): bump the aws group with 3 updates by @dependabot[bot] in buildkite#276
  • chore(deps): bump the aws group with 7 updates by @dependabot[bot] in buildkite#277
  • chore(deps): bump the aws group with 2 updates by @dependabot[bot] in buildkite#278
  • chore(deps): bump the aws group with 2 updates by @dependabot[bot] in buildkite#279
  • chore(deps): bump github.com/aws/aws-sdk-go-v2/service/ec2 from 1.282.0 to 1.285.0 in the aws group by @dependabot[bot] in buildkite#281

Internal

v1.10.1 (2025-12-10)

Full Changelog

Changed

v1.10.0 (2025-12-01)

Full Changelog

Changed

  • SUP-5647: Make instance cap configurable via MAX_INSTANCE_CAP #270 (@Mykematt)
  • chore(deps): bump the aws group with 6 updates #268 (@dependabot[bot])

v1.9.9 (2025-11-19)

Changed

  • Fix availability-based scaling and simplify threshold logic by @scadu in buildkite#257

Dependencies

  • chore(deps): bump github.com/aws/aws-sdk-go-v2/config from 1.31.12 to 1.31.19 by @dependabot[bot] in buildkite#259
  • chore(deps): bump github.com/aws/aws-sdk-go-v2/service/ec2 from 1.261.0 to 1.266.0 by @dependabot[bot] in buildkite#260
  • chore(deps): bump github.com/aws/aws-sdk-go-v2/service/ssm from 1.66.3 to 1.67.1 by @dependabot[bot] in buildkite#262
  • chore(deps): bump github.com/aws/aws-sdk-go-v2/service/cloudwatch from 1.52.0 to 1.52.2 by @dependabot[bot] in buildkite#261
  • chore(deps): bump github.com/aws/aws-sdk-go-v2/service/autoscaling from 1.60.2 to 1.60.4 by @dependabot[bot] in buildkite#264
  • chore(deps): bump the aws group with 5 updates by @dependabot[bot] in buildkite#266

Internal

  • Dependabot weekly, add agent-stewards to CODEOWNERS by @DrJosh9000 in buildkite#258
  • Group AWS library updates together by @DrJosh9000 in buildkite#265

v1.9.8 (2025-11-06)

Changed

Dependencies

  • chore(deps): bump github.com/aws/aws-sdk-go-v2/service/cloudwatch from 1.51.1 to 1.52.0 by @dependabot[bot] in buildkite#253
  • chore(deps): bump github.com/aws/aws-lambda-go from 1.49.0 to 1.50.0 by @dependabot[bot] in buildkite#252
  • chore(deps): bump github.com/aws/aws-sdk-go-v2/service/ssm from 1.61.1 to 1.66.3 by @dependabot[bot] in buildkite#249
  • chore(deps): bump github.com/aws/aws-sdk-go-v2/service/autoscaling from 1.59.3 to 1.60.2 by @dependabot[bot] in buildkite#250
  • chore(deps): bump github.com/aws/aws-sdk-go-v2/service/ec2 from 1.254.1 to 1.260.0 by @dependabot[bot] in buildkite#251

v1.9.7 (2025-10-30)

  • Update Go Version to 1.25.1 #247 (lizrabuya)
  • chore(deps): bump github.com/aws/aws-sdk-go-v2/service/autoscaling from 1.55.1 to 1.59.3 #240 (dependabot[bot])
  • chore(deps): bump github.com/aws/aws-sdk-go-v2/config from 1.30.2 to 1.31.12 #242 (dependabot[bot])
  • chore(deps): bump github.com/aws/aws-sdk-go-v2 from 1.37.1 to 1.39.2 #244 (dependabot[bot])

v1.9.6 (2025-08-27)

v1.9.5 (2025-06-23)

  • fix: scope down ElasticCIModeSSMAndEC2 policy #221

v1.9.4 (2025-06-11)

  • fix: correct permissions to handle instances in ElasticCIMode #219 (scadu)
  • fix: bump Go to 1.24 to mitigate CVE-2025-22871 #218 (scadu)

v1.9.3 (2025-06-06)

  • feat: graceful scale-in for Elastic CI Stack #212 (scadu)

v1.9.2 (2025-06-02)

1.9.1 (2025-01-20)

Full Changelog

Changed

  • Add an option to override the agent endpoint URL via flag and env var #203 (@wolfeidau)

Fixed

  • Fix errors in README #196 (@DrJosh9000)

Internal

  • Assume an IAM role for publishing to SAR S3 bucket #201 (@yob)
  • Update release process to assume new IAM roles via OIDC #202 (@yob)
  • Update the role used to publish SAR #200 (@yob)
  • Bump github.com/aws/aws-sdk-go from 1.54.19 to 1.55.5 #192 (@dependabot[bot])

v1.9.0 (2024-07-29)

Full Changelog

Changed

  • Enable subnet and security group configuration in Cloudformation #191 (@bnovick)

v1.8.0 (2024-07-18)

Full Changelog

Changed

  • The scaler will run at least once, regardless of LAMBDA_TIMEOUT #188 (@DrJosh9000)

Internal

  • Dependabot updates #185, #186, #114 (@dependabot[bot])
  • Fix dependabot reviewers #187 (@DrJosh9000)
  • Added Using Cluster #183 (@stephanieatte)
  • Calm dependabot down a little #179 (@yob)
  • Update README example due to end of support for the Go 1.x runtime #139 (@tomowatt)

v1.7.0 (2023-10-13)

Full Changelog

Changed

  • Updated lambda runtime to provided.al2 in light of end of support for the Go 1.x runtime #108 (@HugeIRL)

Updated

  • Bump github.com/aws/aws-sdk-go 1.45.25 #109 #106 (@dependabot[bot])
  • Bump github.com/aws/aws-lambda-go from 1.7.0 to 1.41.0 #107 (@dependabot[bot])

Internal

  • Add dependabot #105 (@triarius)

v1.6.0 (2023-09-13)

Full Changelog

Changed

  • Change EventScheduleRate parameter to EventSchedulePeriod and require units #102 (@triarius)

Internal

  • Fix scaler release does not prepend a v to the version on s3 #99 (@triarius)

v1.5.1 (2023-08-22)

Full Changelog

Added

  • A new release process which will fix publish releases to S3 #97 (@triarius)

v1.5.0 (2023-07-25)

Full Changelog

Added

  • Add MinPollInterval param #94 (@DrJosh9000)
  • Allow the event schedule rate to be configured via parameters #93 (@tomellis91)

Fixed

  • DescribeScalingActivities should be called only once per lambda instance #95 (@DrJosh9000)
  • A fix to the release process (Assume the OIDC role for release-version) #91 (@sj26)

Changed

  • Use the metrics route scoped to a queue to get metrics for the queue #92 (@triarius)

v1.4.0 (2023-05-17)

Full Changelog

Added

  • A parameter to configure logs retention #75 (@Amir-Ahmad)
  • A parameter to limit pagination of autoscaling:DescribeScalingActivity #81 (@triarius)
  • A parameter for stack name and use it in lambda function description #70 (@ellsclytn)
  • A parameter to allow running scaler with a fixed size instance buffer #72 (@wbond)

Changed

  • Allow releasing development versions of buildkite-agent-scaler to an "edge" serverless repo #83 (@triarius)

Updated

  • Update go 1.15 -> 1.19 #77 (@moskyb)
  • Bump github.com/aws/aws-sdk-go to 1.34.0 #78 #76 (@dependabot[bot])
  • Improvements to code formatting and clarity #88 (@moskyb)
  • Improvements to CI #82 (@triarius) #87 #86 (@yob)

1.3.2 (2022-08-04)

Full Changelog

Fixed

  • Update IAM policy to allow describing scaling activities #61 (@zl4bv)

v1.3.1 (2022-06-09)

Full Changelog

Changed

  • Fix CI snafu that caused 1.3.0 to never be properly released #64 (@moskyb)

1.3.0 (2022-06-07)

Full Changelog

Changed

  • Add ability to use permissions boundary #62 (@kwong-chong-lfs)

v1.2.0 (2021-11-22)

Added

  • Restore last scale in and out event times from Auto Scale group activity #52 (@gu-kevin)
  • DisableScaleIn parameter to template #59

v1.1.3 (2021-10-28)

  • Fix crash when publishing CloudWatch metrics #56 (@eleanorakh)

v1.1.2 (2021-10-25)

  • Fix BuildkiteAgentTokenParameter when using AWS Secrets Manager reference syntax #53
  • Add new SCALE_ONLY_AFTER_ALL_EVENT environment variable to respect cooldown after scale events #51 @gu-kevin

v1.1.0 (2021-04-14)

  • When the elastic stack is very small (<=2 running instances), consider adding a new instance when we suspect the current instances are shutting down and there's pending jobs #40 (nitrocode)

v1.0.2 (2020-10-19)

  • Respect Auto Scaling Group MaxSize and MinSize #37 (nitrocode)
  • Support 6 more regions: af-south-1, ap-east-1. ca-central-1, eu-south-1, eu-west-3, eu-north-1, me-south-1 #33 (JuanitoFatas)

v1.0.1 (2019-11-27)

  • Handle HTTP errors from metrics API #23 (pda)
  • Fix suspected typo in lambda env var #22 (amu-g)
  • Correct required environment variables in README #19 (mikenicholson)

v1.0.0 (2019-05-05)

Full Changelog

Changed

  • Support scaling based on waiting jobs behind wait steps #17 (@lox)
  • Add a configurable scale factor to scale in/out #13 (@lox)
  • Support reading Agent Token from SSM Parameter Store #15 (@lox)
  • Respect poll duration header from agent api #14 (@lox)
  • Add detailed readme #16 (@lox)

v0.4.1 (2019-04-16)

Full Changelog

Changed

  • Public to newer aws regions (ca-central-1, eu-north-1 and eu-west-3) #11 (@lox)

v0.4.0 (2019-03-25)

Full Changelog

Changed

  • Add DISABLE_SCALE_IN param to opt-out of scale in #10 (@lox)
  • Factor running jobs into scaling decisions #9 (@lox)
  • Add scale-in cooldown support #6 (@etaoins)
  • Release to github #5 (@lox)

v0.3.0 (2019-02-27)

Full Changelog

Changed

  • Add an invocation counter to detect cold starts #4 (@lox)
  • Add cloudwatch metrics publishing #3 (@lox)