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Each week, the CMS Hybrid Cloud program provides a list of upcoming changes, maintenance windows, and updates to help customers build awareness and plan effectively and summarizes changes from the previous week.
This newsletter includes:
Completed change summary for the week of 1/15/2026
- 1/17/2026 - Downscale Splunk Prod Indexers to 75
- 1/17/2026 - DevOps Services Maintenance
- 1/21/2026 - Azure Update Manager Patching - Dev/Test/IMPL
- 1/21/2026 - Marketplace SSM Patching - Dev/Test
- 1/21/2026 - Non-Marketplace SSM Patching - Dev/Test/IMPL
- Open Enrollment (OE13) - Moratorium
To learn details about previous changes please go to the News and Updates section on cloud.cms.gov. (Secure Access required)
For Patching and Gold Image release schedule please view: Patching and Gold Image Release Calendar - 2026
1/24/2026 - Downscale Splunk Prod Indexers to 57
Summary:
The Logging Services team will scale down Splunk indexer infrastructure as part of post Open Enrollment (OE) activities.
Actions we are taking:
- Downscaling Splunk indexers using IAC
When is this happening?
Start Time: Saturday, 1/24/26 at 6:00 am ET
End Time: Saturday, 1/24/26 at 6:00 pm ET
Who will be impacted?
DRaaS ITSI, MITG MSI and EMM may have performance impacts when the Cloud Splunk indexers are being downscaled. Also, CCIC search heads peered to the Splunk environment might be impacted.
What is the impact?
There may be latency in adhoc searches that are performed by customers. Dashboards might also render slowly and have incomplete data while the changes are being propagated.
This is part of OE13 close out work.
1/25/2026 - Restart Production, Non-Prod and GovCloud HEC Servers
Summary:
The CMS Hybrid Cloud Splunk team will perform a rolling restart of the HEC Splunk Services to clear any potential queue issues.
Actions we are taking:
- Restarting the Prod and Non-Prod HEC Forwarders
When is this happening?
Start Time: Sunday, 1/25/2025 at 9:00 a.m. ET
End Time: Sunday, 1/25/2025 at 11:00 a.m. ET
Who will be impacted?
MITG and MSI
What is the impact?
This change has low impact. We have 45 prod HEC services and 18 Non-Prod and we only restart 5 at a time. The majority of load balanced HEC servers will be available as the restarts progress and they have sufficient capacity to handle all ingest streams.
1/28/2026 - Azure Update Manager Patching - PROD
Summary:
As part of our normal patching, the CMS Hybrid Cloud team will apply the latest Windows and Linux patches on Wednesday, 1/28/2026 at 9:00 p.m. ET. The week's patches will impact the PROD environment for the affected MAG applications noted below.
Actions we are taking:
- MAG PROD
- MAG Linux & Windows Vulnerability Patching
When is this happening?
Start Time: Wednesday, 1/28/2026 at 9:00 p.m. ET
End Time: Thursday, 1/29/2026 at 2:00 a.m. ET
Who will be impacted?
Subscription:
CMS.VDC-CCS.IUSG.SharedServices.001.AG
ScopeInfoTech-CM-HEDIS PLD-005
Resource Group with Reboot:
RG-SS-LDAP-PROXY-PROD
rg-splunk-prod
NoReboot:
RG-AZE-HEDISPLD-PROD
What is the impact?
Patches will be transmitted to the affected areas. For some customers, reboots may occur depending upon the tags applied.
1/28/2026 - Non-Marketplace PROD SSM Patching
Summary:
As part of our normal patching, the CMS Hybrid Cloud team will apply the latest Windows and Linux patches on Wednesday, 1/28/2026 at 9:00 p.m. ET. The week's patches will impact the PROD environment for the affected Non-Marketplace applications noted below.
Actions we are taking:
- Non-Marketplace PROD
- SSM Linux & Windows Vulnerability Patching
When is this happening?
Start Time: Wednesday, 1/28/2026 at 9:00 p.m. ET
End Time: Thursday, 1/29/2026 at 2:00 a.m ET
Who will be impacted?
Reboot - CEDAR, FFSDCS, RASS, OC Base- eLDAP, SC CLIA, NTP LMS, Spott MACBIS, MDP, OC Base- WNMG, NEIL/HRES, OC Base- EWST, MacFin, eAPD Hi-C, OC Base- CMS Cloud Legacy, OC Base- DevSecOps SecDevOps, iServ, MDP, PECOS2.0, SEI, OC Base- PWSS, TRA, CMS ARTS, MCIM, RAD Analysis Tools, MCIM, Perm, CMS Cloud - CRE, CMS Cloud - Enterprise Agile Tools, CMS Cloud tamer, CMS Cloud - CARD, CMS Cloud - ECS Fargate, CMS Cloud - Direct Connect, CMS Cloud - Jfrog SonarCube, CMS Cloud - DNS Prod, CMS Cloud - SRE, CMS Cloud - Governance 2.0, MEOWx, CMS Cloud - CloudBees Jenkins, CMS Cloud - CET, CMS Cloud - DevSecOps, CMS Cloud - Utilities, CMS Cloud - Testrail, CMS Cloud - CircleCI, CMS Cloud - Sam GSS Security GovCloud, SWIFT, AWS HEIDI, MDX, MSPSC, QMAC
No reboot - MEPBS, EACMS, MacPro, PS&R, RDS, OC Base- APIM GEO, 1115 PMDA, CMS Cloud - Governance 2.0, CMS Cloud - QuickDNS, CMS Cloud - CMSNet, CMS Cloud - CCG Web Content, CMS Cloud - Network Arch, CMS Cloud - VPC Automation, CMS Cloud - Security Team, CMS Cloud - CCG Web Content, CMS Cloud Temporal, CMS Cloud - Splunk, CMS Cloud - CET, AWS GSS Security GC, occonfluence, ocjira, miniorange, ocsonarqube, MTF-PM, NDW, MacFin, MTF-DM
What is the impact?
Patches will be transmitted to the affected areas. For some customers, reboots may occur depending upon the tags applied.
1/28/2026 - Marketplace SSM Patching - IMPL
Summary:
As part of our normal patching, the CMS Hybrid Cloud team will apply the latest Windows and Linux patches on Wednesday, 1/28/2026 at 9:00 p.m. ET. The week's patches will impact the IMPL environment for the affected Marketplace applications noted below.
Actions we are taking:
- Marketplace IMPL
- SSM Linux & Windows Vulnerability Patching
When is this happening?
Start Time: Wednesday, 1/28/2026 at 9:00 p.m. ET
End Time: Thursday, 1/29/2026 at 2:00 a.m. ET
Who will be impacted?
FFM_Opera, XES - CyberArk, VAMS, TWS, XES - XOC Tools, SERVIS, FFM_Shared_Services, FFM MLMS, XES - MSI Tech Lab, FFM_FM, FFM_TWS, XES - Service Virtualization
DSRS, FFM, FFM DSH, FFM EDI, FFM EFT, FFM ESDCU, MCR, FLH, OC Base- FLH, OC Base PET, FFM_MNPS, CMS Cloud - Advanced Monitoring
What is the impact?
Patches will be transmitted to the affected areas. For some customers, reboots may occur depending upon the tags applied.
Need help? We are here to support you.
If you have any questions, don't hesitate to reach out to your assigned Hosting Coordinator. CMS IT Support can be reached via cloudsupport@cms.hhs.gov, or call (800) 562-1963, and is documented here at Support Page on cloud.cms.gov.
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