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

[DavidColey]

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

[nbrown]

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.

[DerekLaw]

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? 

[nbrown]

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.

[DavidColey]

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....

[DavidColey]

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%

[DavidColey]

@DerekLaw Esri Case #03926364 

Thanks,

David

[DavidColey]

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.

[GavinCollins1]

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

[DerekLaw · Accepted solution]

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,