Upgrade infrastructure with integration points

A system comprising:

• one or more processors;
• and
• a memory comprising code stored thereon that, when executed by at least a first of the one or more processors, performs a method comprising:
• defining a plurality of integration points, wherein each of the plurality of integration points is associated with one of a first plurality of workflow processing points included in an upgrade workflow, wherein the upgrade workflow includes a second plurality of workflow processing points comprising the first plurality of workflow processing points;
• associating a first code entity with a first of the plurality of integration points;
• and
• performing first processing that executes the upgrade workflow to upgrade a plurality of storage appliances, wherein a first software cluster of components is installed on the plurality of storage appliances and wherein a second software cluster of components is installed on the plurality of storage appliances, wherein upgrading the plurality of storage appliances by the first processing includes upgrading the first software cluster of components installed on the plurality of storage appliances from a first current version to a first new version, and upgrading the second software cluster of components installed on the plurality of appliances from a second current version to a second new version, wherein the first processing further includes:
• prior to upgrading a first of the plurality of storage appliances, executing first code corresponding to the first integration point;
• in response to executing the first code corresponding to the first integration point, invoking the first code entity associated with the first integration point, wherein said first code entity performs at least a first task in connection with the second cluster software prior to upgrading the first storage appliance;
• and
• performing said upgrading the first storage appliance including upgrading a first component of the first software cluster from the first current version to the first new version and upgrading a second component of the second software cluster from the second current version to the second new version, wherein the first component and the second component are installed on the first storage appliance.