Understanding how Klaviyo monitors flow performance

First, check your filters to see if they are causing profiles to leave the flow. To do so, follow these steps:

1. Click on the trigger of your flow.
2. In the left sidebar, click Preview Trigger Setup.
3. In the preview modal, review profiles that would trigger your flow and if they qualify for your profile filters.
   
4. If you notice many profiles are failing your profile filters when they should be entering the flow, check your profile filters to make sure they are set up the way you intended.
5. If necessary, change your profile filters by clicking profile filters in the left sidebar when viewing the flow trigger.

If you are unsure if a change has been made to your flow, you can check the flow’s changelog. If the timestamp of the changes coincide with when you started experiencing issues with your flow, it is likely that the change is the source of the issue.

Follow these steps to view a flow’s history:

1. In the dropdown menu, click View Flow History.
   
2. View the Flow History panel on the right-hand side of the screen.
   
3. Review the changelog to see if any of the flow’s filters have changed recently.

Find out more about the Flow History panel in our article on how to review the changelog for a flow.

Your sender address should match your website domain; otherwise, this can lead to issues with sending. For example, if your website URL is example.com, your sender email address should end in @example.com. Emails sent using a personal email address domain (such as @gmail.com, @yahoo.com, or @outlook.com) will be blocked from sending.

To check your sender address:

1. Click on an email in your flow.
2. Click Edit in the left sidebar.
3. Check the address entered in the Sender email address field.
   
4. Change this address if necessary.

If you have updated the content of your messages, make sure that the content abides by email deliverability best practices in order to avoid spam filters.

• Avoid spammy subject lines, such as "JUST THIS ONCE FOR A LIMITED TIME ONLY"
• Find a balance between images and text.
• Limit the number of URLs.
• Avoid adding unnecessary code to messages.
• Use dynamic variables to personalize messages.

Learn more about deliverability best practices.

Welcome series flows and other list-triggered flows are triggered when a subscriber joins a specified list. 

To make sure your list is still receiving new subscribers:

1. Click on the trigger of the flow.
2. In the left sidebar, click the name of the list that triggers your flow.
3. In the Date added column, check the last time a profile was added.
4. If new profiles haven’t been added to your list in a long time, make sure any sign-up forms associated with your list are still visible on your website.

If you are using Shopify or Magento, you can automatically generate new coupon codes to avoid running out. This issue only applies if you are using the option to upload coupon codes.

For flow messages that contain a dynamic coupon code, the message will not be sent if there are no more coupon codes left.

To check how many coupon codes you have left:

1. Using the main Klaviyo navigation bar, navigate to Content > Coupons.
2. Click Uploaded Coupons.
3. See the Available/Total column on the right of the coupon to check how many coupon codes are left.
4. If no codes remain, click the action button on the far right and choose Add Coupons to upload more.

Learn more from our article on getting started with coupon codes.

If your flow is triggered by a segment, a change in the segment definition can prevent new profiles from entering the segment, thus causing a drop in flow sending.

To make sure your segment is still receiving new members:

1. Click on the trigger of the flow.
2. In the left sidebar, click the name of the segment that triggers your flow.
3. If there are profiles in the segment, check the Date added column to see the last time a profile was added.
4. If there are no profiles in the segment or new profiles haven’t been added in a long time, click Edit Definition to view the segment’s definition.
5. Make sure:
1. The segment definition is configured to capture the people you intend. 
2. None of the segment conditions contradict each other like the example below. In this example, there’s a condition that checks if someone opened an email at least once as well as a condition that checks if someone has also never opened an email. Since someone can’t fulfill both conditions simultaneously, no one will enter the segment.
   
6. If necessary, change the segment definition and click Update Segment. 
7. Segment-triggered flows only trigger when people enter the segment organically. If people enter the segment due to a change in definition, you will have to manually send older profiles through the flow.