Webhooks intermittently not triggered

Webhooks are not being triggered intermittently. Currently we're seeing this issue on Mercurial Repositories.

Example :

When a push is made webhooks is not triggered. However a webhook gets triggered after several pushes later. The same happens intermittently for subsequent pushes.

Update

• This issue appears to be affecting Slack notifications as well. Intermittently, Slack notifications are not being received.
• Upon further checking of the Webhooks log, there were no events triggered for several commits.