feat(crons): Migrate guid to slug

migrations_lockfile.txt

@@ -6,5 +6,5 @@ To resolve this, rebase against latest master and regenerate your migration. Thi
 will then be regenerated, and you should be able to merge without conflicts.
 
 nodestore: 0002_nodestore_no_dictfield
-sentry: 0366_add_slug_to_monitors
+sentry: 0367_migrate_monitor_guid_to_slug
 social_auth: 0001_initial

src/sentry/migrations/0367_migrate_monitor_guid_to_slug.py

@@ -0,0 +1,44 @@
+# Generated by Django 2.2.28 on 2023-02-28 01:51
+
+from django.db import migrations
+
+from sentry.new_migrations.migrations import CheckedMigration
+from sentry.utils.query import RangeQuerySetWrapperWithProgressBar
+
+
+def migrate_monitor_slugs(apps, schema_editor):
+    Monitor = apps.get_model("sentry", "Monitor")
+
+    for monitor in RangeQuerySetWrapperWithProgressBar(Monitor.objects.filter()):
+        # Nothing to migrate if the monitor already has a slug
+        if monitor.slug is not None:
+            continue
+
+        monitor.slug = str(monitor.guid)
+        monitor.save()
+
+
+class Migration(CheckedMigration):
+    # This flag is used to mark that a migration shouldn't be automatically run in production. For
+    # the most part, this should only be used for operations where it's safe to run the migration
+    # after your code has deployed. So this should not be used for most operations that alter the
+    # schema of a table.
+    # Here are some things that make sense to mark as dangerous:
+    # - Large data migrations. Typically we want these to be run manually by ops so that they can
+    #   be monitored and not block the deploy for a long period of time while they run.
+    # - Adding indexes to large tables. Since this can take a long time, we'd generally prefer to
+    #   have ops run this and not block the deploy. Note that while adding an index is a schema
+    #   change, it's completely safe to run the operation after the code has deployed.
+    is_dangerous = False
+
+    dependencies = [
+        ("sentry", "0366_add_slug_to_monitors"),
+    ]
+
+    operations = [
+        migrations.RunPython(
+            migrate_monitor_slugs,
+            migrations.RunPython.noop,
+            hints={"tables": ["sentry_monitior"]},
+        ),
+    ]