ENH: Add Ert experiment id to FMU metadata block

schema/definitions/0.8.0/schema/fmu_results.json

@@ -951,6 +951,44 @@
       "title": "DomainReference",
       "type": "string"
     },
+    "Ert": {
+      "description": "The ``fmu.ert`` block contains information about the current ert run.",
+      "properties": {
+        "experiment": {
+          "anyOf": [
+            {
+              "$ref": "#/$defs/Experiment"
+            },
+            {
+              "type": "null"
+            }
+          ],
+          "default": null
+        }
+      },
+      "title": "Ert",
+      "type": "object"
+    },
+    "Experiment": {
+      "description": "The ``fmu.ert.experiment`` block contains information about\nthe current ert experiment run.",
+      "properties": {
+        "id": {
+          "anyOf": [
+            {
+              "format": "uuid",
+              "type": "string"
+            },
+            {
+              "type": "null"
+            }
+          ],
+          "default": null,
+          "title": "Id"
+        }
+      },
+      "title": "Experiment",
+      "type": "object"
+    },
     "FMU": {
       "dependencies": {
         "aggregation": {
@@ -987,6 +1025,17 @@
         "context": {
           "$ref": "#/$defs/Context"
         },
+        "ert": {
+          "anyOf": [
+            {
+              "$ref": "#/$defs/Ert"
+            },
+            {
+              "type": "null"
+            }
+          ],
+          "default": null
+        },
         "iteration": {
           "anyOf": [
             {

src/fmu/dataio/_model/fields.py

@@ -202,6 +202,22 @@ class Case(BaseModel):
     """A free-text description of this case."""
 
 
+class Ert(BaseModel):
+    """The ``fmu.ert`` block contains information about the current ert run."""
+
+    experiment: Optional[Experiment] = Field(default=None)
+    """Reference to the ert experiment.
+    See :class:`Experiment`."""
+
+
+class Experiment(BaseModel):
+    """The ``fmu.ert.experiment`` block contains information about
+    the current ert experiment run."""
+
+    id: Optional[UUID] = Field(default=None)
+    """The unique identifier of this ert experiment run."""
+
+
 class Iteration(BaseModel):
     """
     The ``fmu.iteration`` block contains information about the iteration this data
@@ -575,6 +591,10 @@ class FMU(FMUBase):
     """The ``fmu.realization`` block contains information about the realization this
     data object belongs to. See :class:`Realization`."""
 
+    ert: Optional[Ert] = Field(default=None)
+    """The ``fmu.ert`` block contains information about the current ert run
+    See :class:`Ert`."""
+
     @model_validator(mode="before")
     @classmethod
     def _dependencies_aggregation_realization(cls, values: Dict) -> Dict:

src/fmu/dataio/providers/_fmu.py

@@ -29,6 +29,7 @@
 from __future__ import annotations
 
 import os
+import uuid
 from dataclasses import dataclass, field
 from enum import Enum, auto
 from pathlib import Path
@@ -179,6 +180,13 @@ def get_metadata(self) -> internal.FMUClassMetaData:
                 context=self._get_fmucontext_meta(),
                 model=self._get_fmumodel_meta() if self.model else case_meta.fmu.model,
                 workflow=self._get_workflow_meta() if self.workflow else None,
+                ert=fields.Ert(
+                    experiment=fields.Experiment(
+                        id=uuid.UUID(FmuEnv.EXPERIMENT_ID.value)
+                        if FmuEnv.EXPERIMENT_ID.value
+                        else None
+                    )
+                ),
             )
 
         iter_uuid, real_uuid = self._get_iteration_and_real_uuid(
@@ -191,6 +199,13 @@ def get_metadata(self) -> internal.FMUClassMetaData:
             workflow=self._get_workflow_meta() if self.workflow else None,
             iteration=self._get_iteration_meta(iter_uuid),
             realization=self._get_realization_meta(real_uuid),
+            ert=fields.Ert(
+                experiment=fields.Experiment(
+                    id=uuid.UUID(FmuEnv.EXPERIMENT_ID.value)
+                    if FmuEnv.EXPERIMENT_ID.value
+                    else None
+                )
+            ),
         )
 
     @staticmethod

tests/test_units/test_dataio.py

@@ -1000,3 +1000,33 @@ def test_append_to_alias_list(globalconfig2, regsurf):
     # also check that the name input was added to the alias list
     assert name not in strat["alias"]
     assert name in meta["data"]["alias"]
+
+
+def test_ert_experiment_id_present_in_generated_metadata(
+    fmurun_w_casemetadata, monkeypatch, globalconfig1, regsurf
+):
+    """Test that the ert experiment id has been set correctly
+    in the generated metadata"""
+
+    monkeypatch.chdir(fmurun_w_casemetadata)
+
+    edata = ExportData(config=globalconfig1, content="depth")
+    meta = edata.generate_metadata(regsurf)
+    expected_id = "6a8e1e0f-9315-46bb-9648-8de87151f4c7"
+    assert meta["fmu"]["ert"]["experiment"]["id"] == expected_id
+
+
+def test_ert_experiment_id_present_in_exported_metadata(
+    fmurun_w_casemetadata, monkeypatch, globalconfig1, regsurf
+):
+    """Test that the ert experiment id has been set correctly
+    in the exported metadata"""
+
+    monkeypatch.chdir(fmurun_w_casemetadata)
+
+    edata = ExportData(config=globalconfig1, content="depth")
+    out = Path(edata.export(regsurf))
+    with open(out.parent / f".{out.name}.yml", encoding="utf-8") as f:
+        export_meta = yaml.safe_load(f)
+    expected_id = "6a8e1e0f-9315-46bb-9648-8de87151f4c7"
+    assert export_meta["fmu"]["ert"]["experiment"]["id"] == expected_id

tests/test_units/test_ert_context.py

@@ -37,7 +37,7 @@ def test_regsurf_generate_metadata(fmurun_w_casemetadata, rmsglobalconfig, regsu
 
 
 def test_incl_jobs_warning(rmsglobalconfig):
-    """Check that usning the deprecated class variable include_ertjobs gives warning."""
+    """Check that using the deprecated class variable include_ertjobs gives warning."""
 
     dataio.ExportData.include_ertjobs = True