Anybody else disabling Meraki instances by default?

We experience similar issues - Meraki devices disappear at random during active discovery phases.

We monitor a couple of Meraki organizations with LM. The issue only seems to appear for one org - the one with more than 30 monitored networks. All other orgs we monitor with LM have 10 or less networks.

So it seems like the issue is related to the number of networks within an org. I decided to have a closer look at the API requests against Meraki during an active discovery phase where once again lots of devices disappeared from our portal.

Meraki offers you some great endpoints for investigating API requests, I used the one documented here: https://developer.cisco.com/meraki/api-latest/#!list-the-api-requests-made-by-an-organization

I evaluated a 20 mins window during which I was pretty sure active discovery was running. During this windows LM resp. its collector installed on one of our servers made 2000 requests. 700 (more than one third) of them failed, ending in a 429 - too many requests error.

So yes, there might be some exception handling / rate limiting checks into the core modules. But if you hit an API that hard, requests might be blocking each other. It seems like there is an issue with rate limit synchronization across discovery jobs – i.e. the more networks you monitor, the more discovery jobs are running in parallel and as a conclusion the more 429 errors you will get ending in randomly disappearing Meraki instances (because the instance couldn't be found in the Meraki response body).

We have a case open since April regarding this issue. I also shared my assumption with LM including several hundred failed Meraki API requests. Let's now wait and see.