Issue #3328886: Make it clear that CSV exports are limited

docs/guide/export.md

@@ -7,6 +7,11 @@ All [Asset](/guide/assets), [Log](/guide/logs), and
 the bottom that will generate and download a CSV file. Any sorts or filters
 that are applied to the list will be represented in the CSV output.
 
+**Warning: CSV exports do not include all data.**
+
+The [farmOS API](/development/api) is the best way to get access to all raw data
+in a farmOS instance.
+
 ## KML
 
 The *farmOS KML* module provides an option for exporting the geometry of one or

modules/core/export/modules/csv/src/Form/EntityCsvActionForm.php

@@ -192,6 +192,13 @@ class EntityCsvActionForm extends ConfirmFormBase {
    */
   public function buildForm(array $form, FormStateInterface $form_state, $entity_type_id = NULL) {
 
+    // Make it clear that CSV exports are limited.
+    $form['warning'] = [
+      '#type' => 'html_tag',
+      '#tag' => 'strong',
+      '#value' => $this->t('Warning: CSV exports do not include all data.'),
+    ];
+
     // If we don't have an entity type or list of entities, redirect.
     $this->entityType = $this->entityTypeManager->getDefinition($entity_type_id);
     $this->entities = $this->tempStore->get($this->user->id() . ':' . $entity_type_id);