Sunday, 12 January 2020

APIM Notes

 5 Pricing Versions of APIM:

  1. Developer Version (No SLA) - No prod data but has all the premium features.
  2. Consumption Model (99.95% SLA) - priced per request serviced.  Missing Dev portal, not a static IP adr - automatically scales, 
  3. Basic  (99.95% SLA)  - No AAD integration - Scales to 2 units
  4. Standard  (99.95% SLA)  - Scales to 4 units
  5. Premium  (99.99% SLA)  - Allows Custom Domains - unlimited scale.  Also allows a single APIM instance to be scaled to more than 1 Azure Region.  Also direct VNET access is only available in premium.
One can move (scale up or down) between Azure APIM pricing tiers but it take up to 45 minutes.  
All consumption pricing tiers require the owner to setup or perform scaling. 
APIM has Metrics to determine if the number of APIM units should be increased or decreased.  The best metric is the capacity metric made up of  Note: Ignore short spikes look for an average over 15 minutes.  Microsoft suggests that the APIM Capacity metric running over 60% to 70% for a period of 30 minutes would indicate that scaling is appropriate.
When building your scaling strategy understand that adding APIM Units takes time (roughly 30 min) so scaling at 60% may not work for flash traffic in which case you'll need to account for this outside of only using metrics for scaling.
Tip: Regionally deployed APIM instances point to a single back-end URL, so it is best to keep the traffic routed to APIM in the same region as the back-end for simple scenarios, use the other region for failures and obviously you can multi-route back end traffic using Front Door for larger deployments.

Tip: Use Azure Key Vault for secrets.

Developer Portal - part of APIM, this portal/website is highly "customisable" and allows users to discover/consume our API's.  User can check their access (only see API's they have access to) and to try/test the API.


  • Users > Groups > Products > API EndPoints
  • Subscriptions assigned to 1) products or/and 2)API endpoints.
  • Transition policies great for turning SOAP into JSON.  There are a lot of OOTB policies, easy to create policies using C#.
  • APIM Extension for VS Code is nice for working with APIM.
More Info:

PB APIM Series:


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