Slow/Failing Instance Detail Retrieval in Durable Functions Monitor

[misteriks]

We are experiencing persistent issues with Durable Functions Monitor (DFM) when attempting to retrieve details of Durable Functions instance IDs. We are currently on DFM version 6.7, but this problem has been ongoing for approximately one to two weeks and was observed before this version.

Symptoms:

• The overview page for all Durable Functions instances loads, though it can be somewhat slow.
• Attempting to open the details for a specific instance ID either fails completely or takes many minutes for the information to display.

Environments Affected:
This issue has been observed consistently across multiple DFM hosting methods and Azure Function App environments:

• DFM self-hosted in Azure
• DFM VS Code extension
• DFM Docker image
• Both our production and test Azure Function App environments

Initial Hypothesis:
Our current suspicion is that this might be related to our Azure Storage configuration or performance, but this is just an initial guess.

Request:
We are seeking assistance in diagnosing the root cause of this performance degradation and guidance on potential troubleshooting steps or resolutions.

[RickDMyers]

I was experiencing exactally the same thing. Listing all orchestrations was quick, but any attempt to drill into
the orechestration detailed would take minutes to execute.

I was able to fix the issue by running a docker container using 6.5 instead of 6.7.

I haven't tried 6.6.

[misteriks]

I can confirm that going back to 6.6 in my docker container made the instance id retrieval quick again as well

[TomCharman]

Same here, thank you @RickDMyers

[scale-tone]

Hey folks,

I'd attribute this issue to this recent change of mine (I admit adding a XXXHistory table scan and expect it to be as fast was a bit optimistic).

Before I come up with a solution, the quick workaround would be to set GetParentInstanceIdRoutine to something benign, e.g.:

DfmEndpoint.Setup(null, new DfmExtensionPoints
{
    GetParentInstanceIdRoutine = (client, connEnvVariableName, hubName, instanceId) => Task.FromResult(string.Empty)
});