topic Re: Monitor 2025 Map Image Services in shared instance all reading at 100% when in use in ArcGIS Monitor Questions

Monitor 2025 Map Image Services in shared instance all reading at 100% when in use

DavidColey — Mon, 09 Jun 2025 18:17:08 GMT

Hello -

I just finished the 2024.1 to 2025.0 Monitor upgrade. Now, any of my map image services that use the Shared Instance (Dynamic Mapping Host) show as 100% saturated. Map Image Services as dedicated types do not.

Thanks,

David

Re: Monitor 2025 Map Image Services in shared instance all reading at 100% when in use

nbrown — Tue, 10 Jun 2025 16:43:20 GMT

I'm having the same issue after completing the upgrade to 2025.0. My map services with Shared Instance are showing 100% saturation when being used.

Re: Monitor 2025 Map Image Services in shared instance all reading at 100% when in use

DerekLaw — Tue, 10 Jun 2025 18:20:27 GMT

Hi @DavidColey and @nbrown,

Can you please open a case with Esri Tech Support so they can investigate and reproduce the behavior you're seeing?

Re: Monitor 2025 Map Image Services in shared instance all reading at 100% when in use

nbrown — Tue, 10 Jun 2025 19:27:53 GMT

This issue is similar to one that has happened in the past:

Solved: Metrics and Alerts on Shared Instances - Esri Community

ArcGIS Monitor does not like shared instance services that has values for service properties "minInstancesPerNode" and "maxInstancesPerNode" set to 0 even though it should be returning the "number of shared instances per machine" value set in server manager.

I resolved this (for the specific map service having this issue) by setting the minInstancesPerNode value to 1 and maxInstancesPerNode to 2. After doing so, ArcGIS Monitor then correctly shows the value set for the shared instance pool and the metrics for instance saturation are then correct.

Re: Monitor 2025 Map Image Services in shared instance all reading at 100% when in use

DavidColey — Wed, 11 Jun 2025 17:57:59 GMT

Ok I too can confirm that what @nbrown in his reply and what @NickN in the this post

Solved: Metrics and Alerts on Shared Instances - Esri Community

do work. I went into ServerAdmin and just changed the max maxInstancesPerNode value to 1 and left the minInstancesPerNode at 0 and am now getting small percentage sat values (like 0.45, 0.56, etc) for these services in the shared instance:

Configured State
Started

Instance Type
Shared

Instance Limits
0 min - 16 max

One of us should still probably report it to support so they can be aware and get a fix, since I still don't know if the Instances node counts are going to revert back to 0,0 when the server restarts or when the ArcGIS Sever exe service restarts....

Re: Monitor 2025 Map Image Services in shared instance all reading at 100% when in use

DavidColey — Wed, 11 Jun 2025 19:07:10 GMT

Yeah once a shared service restarts it will revert back to it's 0.0 setting for min and max InstancePerNode counts and then the Instance Saturation again graphs that service saturation value as 100%

Re: Monitor 2025 Map Image Services in shared instance all reading at 100% when in use

DavidColey — Thu, 12 Jun 2025 19:15:54 GMT

@DerekLaw Esri Case #03926364

Thanks,

David

Re: Monitor 2025 Map Image Services in shared instance all reading at 100% when in use

DavidColey — Wed, 18 Jun 2025 19:37:04 GMT

Ok, I did a screen share with support on this on 06/17, demonstrated the issue by showing the workaround and now we'll see.

Re: Monitor 2025 Map Image Services in shared instance all reading at 100% when in use

GavinCollins1 — Tue, 09 Dec 2025 20:56:53 GMT

@DavidColey @DerekLaw was this issue qualifed as a bug? I am also experiencing the same issue in an ArcGIS Monitor 2025.0 deployment.

Re: Monitor 2025 Map Image Services in shared instance all reading at 100% when in use

DerekLaw — Tue, 09 Dec 2025 22:34:46 GMT

Hi @GavinCollins1,

From Esri Tech Support case 03926364, we identified BUG-000157186 for ArcGIS Monitor. There is a workaround and two feature enhancements were created for ArcGIS Monitor.

ENH-000168870 - Provide the ability to generate metrics for Shared Instances (DynamicMappingHost) under ArcGIS Server Manager usage Statistics.
ENH-000172351 - ArcGIS Monitor does not collect metrics from the DynamicMappingHost service.

Please open a case with Esri Tech Support so we have more information and also prioritize the feature enhancement request.

Hope this helps,

Re: Monitor 2025 Map Image Services in shared instance all reading at 100% when in use

DavidColey — Wed, 10 Dec 2025 14:25:56 GMT

I do not see the specific issue I reported on initially in the release notes for 2025.1:

https://support.esri.com/en-us/patches-updates/2025/arcgis-monitor-2025-1-release-notes?rsource=https%3A%2F%2Fesriurl.com%2Farcgis-monitor-2025-1-release-notes

I just upgraded Enterprise from 11.5 to 12.0. The workaround I had in place is still in place - that is my instances in the Shared Instance pooling for show 0,0 for min,max in Server Manager, but on the backend in Server Admin these same instances show as 0,1.

That is the change I made to these services in admin.

@GavinCollins1 @DerekLaw

I am going to 2025.1 soon, so we'll see if my workaround is affected

Re: Monitor 2025 Map Image Services in shared instance all reading at 100% when in use

DerekLaw — Wed, 10 Dec 2025 15:10:30 GMT

Hi @DavidColey,

> I do not see the specific issue I reported on initially in the release notes for 2025.1

In my previous post, I said there was a workaround for your reported issue and two feature enhancements have been logged to help address it. These have been added to the Dev backlog.

I did NOT say the issue was fixed in the Monitor 2025.1 release, so it is not listed in the release notes.

Hope this helps,

Re: Monitor 2025 Map Image Services in shared instance all reading at 100% when in use

DavidColey — Wed, 10 Dec 2025 16:43:04 GMT

Yep, thanks @DerekLaw I understood that.... no worries