Fix aggregation method

Refactor-migration-guide.md

@@ -199,9 +199,7 @@ The aggregate plugin aggregates data in two ways: first it condenses individual
 
 This is a builtin feature of IF, meaning it does not have to be initialized as a plugin. Instead, you just have to include a short config block in the top of the manifest file. There are two pieces of information required:
 
-- `metrics`: which metrics do you want to aggregate? Every metric you provide here must exist in the output array.
-
-  - `method`: the aggregation method for the specied metric
+- `metrics`: which metrics do you want to aggregate? Every metric you provide here must exist in the output array and be described in the `parameter-metadata` of the plugin.
 
 - `type`: the options are `horizontal`, `vertical` or both. Horizontal aggregation is the type that condenses each time series into a single summary value. Vertical aggregation is aggregated across components.
 
@@ -210,8 +208,7 @@ Here's what the config block should look like:
 ```yaml
 aggregation:
   metrics:
-    'carbon':
-      method: 'sum'
+    - carbon
   type: 'both'
 ```
 

manifests/examples/pipelines/nesting.yml

@@ -6,8 +6,7 @@ tags:
   category: on-premise
 aggregation:
   metrics:
-    "carbon":
-      method: sum
+    - carbon
   type: "both"
 initialize:
   plugins:
@@ -139,6 +138,21 @@ initialize:
           - carbon-operational
           - carbon-embodied
         output-parameter: carbon
+      parameter-metadata:
+        inputs:
+          carbon-operational:
+            description: Operational carbon footprint
+            unit: gCO2eq
+            aggregation-method: sum
+          carbon-embodied:
+            description: Embodied carbon footprint
+            unit: gCO2eq
+            aggregation-method: sum
+        outputs:
+          carbon:
+            description: Total carbon footprint
+            unit: gCO2eq
+            aggregation-method: sum
     time-sync:
       method: TimeSync
       path: "builtin"
@@ -169,10 +183,10 @@ initialize:
             unit: seconds
             description: time reserved for a component
             aggregation-method: avg
-          network/energy: 
-            description: 'Energy consumed by the Network of the component'
-            unit: 'kWh'
-            aggregation-method: 'sum'
+          network/energy:
+            description: "Energy consumed by the Network of the component"
+            unit: "kWh"
+            aggregation-method: "sum"
 tree:
   children:
     child-0:

manifests/examples/pipelines/outputs-if-diff/pipeline-with-aggregate.yaml

@@ -3,8 +3,7 @@ description: a full pipeline with the aggregate feature enabled
 tags: null
 aggregation:
   metrics:
-    carbon:
-      method: sum
+    - carbon
   type: both
 initialize:
   plugins:
@@ -159,6 +158,21 @@ initialize:
           - carbon-operational
           - carbon-embodied
         output-parameter: carbon
+      parameter-metadata:
+        inputs:
+          carbon-operational:
+            description: Operational carbon footprint
+            unit: gCO2eq
+            aggregation-method: sum
+          carbon-embodied:
+            description: Embodied carbon footprint
+            unit: gCO2eq
+            aggregation-method: sum
+        outputs:
+          carbon:
+            description: Total carbon footprint
+            unit: gCO2eq
+            aggregation-method: sum
     time-sync:
       path: builtin
       method: TimeSync