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Montioring PI Notifications

Question asked by cvallee on Dec 5, 2018
Latest reply on Dec 6, 2018 by Dan Fishman

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Hello community,

I am looking into monitoring PI Notifications with Performance counters. I have found a few counters in Performance Monitor however I cannot make sense of all of them.

I believe the "Successful Sends" and the "Failed Sends" counter are good metrics to assess the health of the service.

What are the other Performance counters, would they be more useful ?

Also, I was planning on building a small AF SDK application with Powershell to send an email when the PI Notifications counters indicate a problem as I cannot assume the PI Notifications Service will still be in a good state.

Is that similar to what you guys are doing ? How do you monitor PI Notifications Service ?

Lal_Babu_Shaik

Dec 6, 2018 1:09 AM

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Hi Cedric

Please find the list of performance counters available for PI Notifications : Highlighted few peformance counters which will be helpful to monitor. Would suggest you to create PI Vision dashboard and AF analysis to check if counter is active or stale.

Reference : PI Server

Escalations in Progress: Number of active escalation teams in progress.
Escalations Scheduled: Number of escalation events scheduled since the start of the PI Notifications Service.
Event Frame Changes Observed: Number of event frame changes received from the AF server since the start of the PI Notifications Service. Changes received cause notification instances to start, end, and change state.
Failed Sends: Number of failed send attempts since the start of the PI Notifications Service.
Failed Sends / sec: Rate of failed send attempts per second. This counter displays the difference between the values observed in the last two samples divided by the duration of the sample interval. This counter is not an average over time.
History Updates: Number of history updates written since the start of the PI Notifications Service. History updates include state changes, sends, resends, and escalations events.
Last Update Change to Process Time: The number of milliseconds the last online change item took to process since the time the change was made in the PI AF server. This counter is updated every time the service completes processing an item.
Last Update Receipt to Process Time: The number of milliseconds the last online change item took to process in the PI Notifications Service from its receipt time. This counter is updated every time the service completes processing an item.
Notification Rules in Error: Number of notification rules in error in the PI Notifications Service.
Running Notification Rules: Number of running notification rules in the PI Notifications Service.
Sends in Progress: Number of send attempts currently in progress.
State Changes Observed: Number of notification state changes recorded since the start of the PI Notifications Service. This includes state changes that may not have caused sends because the notification went into a lower state or was within the non-repetition interval.
Stopped Notification Rules: Number of stopped notification rules in the PI Notifications Service.
Successful Sends: Number of successful send attempts since the start of the PI Notifications Service.
Successful Sends / sec: Rate of successful message sends per second. This counter displays the difference between the values observed in the last two samples divided by the duration of the sample interval. This counter is not an average over time.
Total Sends: Number of attempts to send messages to subscribers since the start of the PI Notifications Service.
Total Sends / sec: Rate of attempts to send messages to subscribers per second. This counter displays the difference between the values observed in the last two samples divided by the duration of the sample interval. This counter is not an average over time.
Total Updates Processed: The number of total changes received from the PI AF server since the start of the PI Notifications Service. This is the number of changes the PI Notifications Service has processed from AFSDK'sFindChangedItemscalls.
Total Updates Processed / sec: Rate of total changes processed from the PI AF server. This counter displays the difference between the values observed in the last two samples divided by the duration of the sample interval. This counter is not an average over time.; Thanks,; Lal

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Lal_Babu_Shaik

Dec 6, 2018 1:09 AM

Hi Cedric

Reference : PI Server

Escalations in Progress: Number of active escalation teams in progress.
Escalations Scheduled: Number of escalation events scheduled since the start of the PI Notifications Service.
Event Frame Changes Observed: Number of event frame changes received from the AF server since the start of the PI Notifications Service. Changes received cause notification instances to start, end, and change state.
Failed Sends: Number of failed send attempts since the start of the PI Notifications Service.
Failed Sends / sec: Rate of failed send attempts per second. This counter displays the difference between the values observed in the last two samples divided by the duration of the sample interval. This counter is not an average over time.
History Updates: Number of history updates written since the start of the PI Notifications Service. History updates include state changes, sends, resends, and escalations events.
Last Update Change to Process Time: The number of milliseconds the last online change item took to process since the time the change was made in the PI AF server. This counter is updated every time the service completes processing an item.
Last Update Receipt to Process Time: The number of milliseconds the last online change item took to process in the PI Notifications Service from its receipt time. This counter is updated every time the service completes processing an item.
Notification Rules in Error: Number of notification rules in error in the PI Notifications Service.
Running Notification Rules: Number of running notification rules in the PI Notifications Service.
Sends in Progress: Number of send attempts currently in progress.
State Changes Observed: Number of notification state changes recorded since the start of the PI Notifications Service. This includes state changes that may not have caused sends because the notification went into a lower state or was within the non-repetition interval.
Stopped Notification Rules: Number of stopped notification rules in the PI Notifications Service.
Successful Sends: Number of successful send attempts since the start of the PI Notifications Service.
Successful Sends / sec: Rate of successful message sends per second. This counter displays the difference between the values observed in the last two samples divided by the duration of the sample interval. This counter is not an average over time.
Total Sends: Number of attempts to send messages to subscribers since the start of the PI Notifications Service.
Total Sends / sec: Rate of attempts to send messages to subscribers per second. This counter displays the difference between the values observed in the last two samples divided by the duration of the sample interval. This counter is not an average over time.
Total Updates Processed: The number of total changes received from the PI AF server since the start of the PI Notifications Service. This is the number of changes the PI Notifications Service has processed from AFSDK'sFindChangedItemscalls.
Total Updates Processed / sec: Rate of total changes processed from the PI AF server. This counter displays the difference between the values observed in the last two samples divided by the duration of the sample interval. This counter is not an average over time.; Thanks,; Lal

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cvallee @ Lal_Babu_Shaik on Dec 6, 2018 12:38 PM

Thanks Lal, that is exactly what I was looking for, I missed that reference !

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sraposo

Dec 6, 2018 2:52 PM

Hey Cedric,

As a friendly suggestion I would also monitor the PI Analysis Service if your event frames are being generated by this application.

As you know Notifications are triggered off Event Frames, so if there is an issue with the application generating those Event Frames, those Notifications will not be sent out.

You can find the performance counters for Asset Analytics here: PI Server

I would be cautious with the logic to avoid false positives. For example, the Maximum Latency counter returns the highest current lag for a specific analysis group. There may be one poorly performing group while all others are performing well. You wouldn't want to notify users for this type of issue. However, you could monitor the maximum latency over a period of time, and if it is continuously increasing then there might be a more serious performance issue. Or, if you have an idea of the Event Frame written rate, you could monitor the Event Frame written counter and if that number stops increasing (or increases at a much slower rate) then there might be an issue.

Let us know if you have any follow up questions!

Thanks,

Seb

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Dan Fishman

Dec 6, 2018 3:53 PM

Check out Topview Free and you can monitor the perfmon counters for free and not have to support code/powershell. You can make VOIP calls, do escalation and more if needed.

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4 Replies

Lal_Babu_Shaik Dec 6, 2018 1:09 AM
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Hi Cedric

Please find the list of performance counters available for PI Notifications : Highlighted few peformance counters which will be helpful to monitor. Would suggest you to create PI Vision dashboard and AF analysis to check if counter is active or stale.

Reference : PI Server
Escalations in Progress
Number of active escalation teams in progress.
Escalations Scheduled
Number of escalation events scheduled since the start of the PI Notifications Service.
Event Frame Changes Observed
Number of event frame changes received from the AF server since the start of the PI Notifications Service. Changes received cause notification instances to start, end, and change state.
Failed Sends
Number of failed send attempts since the start of the PI Notifications Service.
Failed Sends / sec
Rate of failed send attempts per second. This counter displays the difference between the values observed in the last two samples divided by the duration of the sample interval. This counter is not an average over time.
History Updates
Number of history updates written since the start of the PI Notifications Service. History updates include state changes, sends, resends, and escalations events.
Last Update Change to Process Time
The number of milliseconds the last online change item took to process since the time the change was made in the PI AF server. This counter is updated every time the service completes processing an item.
Last Update Receipt to Process Time
The number of milliseconds the last online change item took to process in the PI Notifications Service from its receipt time. This counter is updated every time the service completes processing an item.
Notification Rules in Error
Number of notification rules in error in the PI Notifications Service.
Running Notification Rules
Number of running notification rules in the PI Notifications Service.
Sends in Progress
Number of send attempts currently in progress.
State Changes Observed
Number of notification state changes recorded since the start of the PI Notifications Service. This includes state changes that may not have caused sends because the notification went into a lower state or was within the non-repetition interval.
Stopped Notification Rules
Number of stopped notification rules in the PI Notifications Service.
Successful Sends
Number of successful send attempts since the start of the PI Notifications Service.
Successful Sends / sec
Rate of successful message sends per second. This counter displays the difference between the values observed in the last two samples divided by the duration of the sample interval. This counter is not an average over time.
Total Sends
Number of attempts to send messages to subscribers since the start of the PI Notifications Service.
Total Sends / sec
Rate of attempts to send messages to subscribers per second. This counter displays the difference between the values observed in the last two samples divided by the duration of the sample interval. This counter is not an average over time.
Total Updates Processed
The number of total changes received from the PI AF server since the start of the PI Notifications Service. This is the number of changes the PI Notifications Service has processed from AFSDK'sFindChangedItemscalls.
Total Updates Processed / sec
Rate of total changes processed from the PI AF server. This counter displays the difference between the values observed in the last two samples divided by the duration of the sample interval. This counter is not an average over time.
Thanks,
Lal
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- cvallee @ Lal_Babu_Shaik on Dec 6, 2018 12:38 PM
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  Thanks Lal, that is exactly what I was looking for, I missed that reference !
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sraposo Dec 6, 2018 2:52 PM
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Hey Cedric,

As a friendly suggestion I would also monitor the PI Analysis Service if your event frames are being generated by this application.

As you know Notifications are triggered off Event Frames, so if there is an issue with the application generating those Event Frames, those Notifications will not be sent out.

You can find the performance counters for Asset Analytics here: PI Server

I would be cautious with the logic to avoid false positives. For example, the Maximum Latency counter returns the highest current lag for a specific analysis group. There may be one poorly performing group while all others are performing well. You wouldn't want to notify users for this type of issue. However, you could monitor the maximum latency over a period of time, and if it is continuously increasing then there might be a more serious performance issue. Or, if you have an idea of the Event Frame written rate, you could monitor the Event Frame written counter and if that number stops increasing (or increases at a much slower rate) then there might be an issue.

Let us know if you have any follow up questions!

Thanks,
Seb
1 person found this helpful
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Dan Fishman Dec 6, 2018 3:53 PM
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Check out Topview Free and you can monitor the perfmon counters for free and not have to support code/powershell. You can make VOIP calls, do escalation and more if needed.
2 people found this helpful
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