#1076 OIC3 Service Metrics - Monitoring Concurrent Synchronous Requests

The sync request concurrency limit is based on the number of message packs you have assigned to your OIC instance.

1 pack = 100 concurrent sync requests
5 packs = 500 concurrent sync requests
10 packs = 1000 concurrent sync requests etc.

Net, net, you get 100 per pack assigned.

This service limit as well as the others are detailed here.

But how can we monitor this limit, e.g. see if we are in danger of hitting this?

OCI Service Metrics

Well try the following MQL from OCI Service Metrics for Integration -

NumberOfInboundRequests[1m]{resourceId = "<instance-id>"}.groupBy(serviceInstanceOcid).sum()/60 * InboundRequestProcessingTime[1m]{resourceId = "<instance-id>"}.groupBy(serviceInstanceOcid).mean()/1000

Here is a simple example in Service Metrics --> Metrics Explorer (Advanced Mode) -

I run some load tests and check the concurrency -

I check out the chart and see I'm up around the number 90.

Maybe a good idea to consider adding another message pack to this OIC instance.

OCI Alarms

Let's create an alarm, based on this metric -

We also need to amend the query, adding the condition, in my case, > 80.

NumberOfInboundRequests[1m]{resourceId = "<instance-id>"}.groupBy(serviceInstanceOcid).sum()/60 * InboundRequestProcessingTime[1m]{resourceId = "<instance-id>"}.groupBy(serviceInstanceOcid).mean()/1000 >80

Now to defining the alarm target, in my case, I want to send an email to myself.

I run a couple of more tests from SOAP UI, ensuring I exceed 80. I then check my email -

I also receive an email when the alarm is no longer firing -

OCI Logging Analytics

As you see, I've added a widget to monitor concurrent sync requests.

I'll now add another one, to provide a more visual rendering.

and click Run.

Now let's change the visuals - 

That looks better! Now edit the widget name etc. 

Save the widget - now it appears in your dashboard.

Summa Summarum

Now you easily monitor your concurrent synchronous request processing limit. 

You can view your instance limit in your OIC Observability Dashboard - 

I have covered 3 modes of monitoring in this post -

1. Metrics Explorer

2. Alarms

3. OCI Logging Analytics

I would strongly suggest a combination of options 2 & 3.