Annotations from Prometheus/Grafana are not passed over/ raw data is null

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Issue Summary
Hello,
I have a problem with the forwarder plug in, the rawData is sent as null as seen below.

Package sent from prometheus webhook:

POST /api/webhook/prometheus HTTP/1.1
Host: home
User-Agent: Grafana
Content-Length: 1969
Content-Type: application/json
Accept-Encoding: gzip

{"receiver":"kafka","status":"firing","alerts":[{"status":"firing","labels":{"alertname":"Panel Title","grafana_folder":"test"},"annotations":{},"startsAt":"2023-05-10T07:59:00Z","endsAt":"0001-01-01T00:00:00Z","generatorURL":"http://prometheus:3000","fingerprint":"dc2402f707754f2d","silenceURL":"http://prometheus:3000","dashboardURL":"http://prometheus:3000","panelURL":"http://prometheus:3000","values":{"B0":16648},"valueString":"[ var='B0' metric='Value' labels={name=test_random_graph2, group=test, instance=172.xx.xx.xxx:8000, job=mon_TEST, platform=TEST, service=testpr} value=16648 ]"}],"groupLabels":{"alertname":"Panel Title","grafana_folder":"test"},"commonLabels":{"alertname":"Panel Title","grafana_folder":"test"},"commonAnnotations":{},"externalURL":"http://prometheus:3000","version":"1","groupKey":"{}:{alertname=\"Panel Title", grafana_folder="test"}","truncatedAlerts":0,"orgId":1,"title":"[FIRING:1] Panel Title test ","state":"alerting","message":"Firing\n\nValue: B0=16648\nLabels:\n - alertname = Panel Title\n - grafana_folder = test\nAnnotations:\nSource: http://prometheus:3000: http://prometheus:3000: http://prometetheus:3000 http://prometheus:3000"}HTTP/1.1 201 CREATED
Server: nginx
Date: Wed, 10 May 2023 07:59:35 GMT
Content-Type: application/json
Content-Length: 993
Connection: keep-alive
Access-Control-Allow-Origin: http://localhost
Vary: Origin, Accept-Encoding
Content-Encoding: gzip
X-Request-ID: a042be2e-8d08-40c9-ae1a-68f354db7a40

{"alert": {"attributes": {"endsAt": "0001-01-01T00:00:00Z", "externalUrl": "http://prometheus:3000/", "moreInfo": "<a href="http://prometheus:3000Id=1\" target="_blank">Prometheus Graph", "startsAt": "2023-05-10T07:59:00Z"}, "correlate": [], "createTime": "2023-05-10T07:59:35.032Z", "customer": "Home", "duplicateCount": 0, "environment": "Production", "event": "Panel Title", "group": "Prometheus", "history": [{"event": "Panel Title", "href": "http://webalarm", "id": "337323ff-b493-4dc1-92ec-ef7ffc62e1b4", "severity": "warning", "status": "open", "text": "WARNING: n/a is Panel Title", "timeout": 86400, "type": "new", "updateTime": "2023-05-10T07:59:35.032Z", "user": "user", "value": null}], "href": "http://webalert", "id": "337323ff-b493-4dc1-92ec-ef7ffc62e1b4", "lastReceiveId": "337323ff-b493-4dc1-92ec-ef7ffc62e1b4", "lastReceiveTime": "2023-05-10T07:59:35.037Z", "origin": "prometheus/-", "previousSeverity": "indeterminate", "rawData": "{"status": "firing", "labels": {"alertname": "Panel Title", "grafana_folder": "test"}, "annotations": {}, "startsAt": "2023-05-10T07:59:00Z", "endsAt": "0001-01-01T00:00:00Z", "generatorURL": "http://prometheus:3000", "fingerprint": "dc2402f707754f2d", "silenceURL": "http://prometheus:3000", "dashboardURL": "http://prometheus:3000\", "panelURL": "http://prometheus:3000", "values": {"B0": 16648}, "valueString": "[ var='B0' metric='Value' labels={name=test_random_graph2, group=test, instance=172.xx.xx.xxx:8000, job=mon_TEST, platform=TEST, service=testpr} value=16648 ]"}", "receiveTime": "2023-05-10T07:59:35.037Z", "repeat": false, "resource": "n/a", "service": [""], "severity": "warning", "status": "open", "tags": ["grafana_folder=test"], "text": "WARNING: n/a is Panel Title", "timeout": 86400, "trendIndication": "moreSevere", "type": "prometheusAlert", "updateTime": "2023-05-10T07:59:35.037Z", "value": null}, "id": "337323ff-b493-4dc1-92ec-ef7ffc62e1b4", "status": "ok"}

Package sent from plug in:

POST /alert HTTP/1.1
Host: webalarm
sentry-trace: bf25eed8db9a4c4eb0523885e5ce2be0-853e085ae7d2d37f-0
baggage: sentry-trace_id=bf25eed8db9a4c4eb0523885e5ce2be0,sentry-environment=production,sentry-release=9.0.0,sentry-transaction=webhooks.custom
User-Agent: python-requests/2.28.1
Accept-Encoding: gzip, deflate, br
Accept: /
Connection: keep-alive
X-Alerta-Loop: http://webalarm:80
X-Request-ID: c46f07bb-582e-4e52-8dd4-8e97565e246e
Content-Type: application/json
Content-Length: 757
Authorization: Basic Zm9vOmJhcg==

{"id": "337323ff-b493-4dc1-92ec-ef7ffc62e1b4", "resource": "n/a", "event": "Panel Title", "environment": "Production", "severity": "warning", "correlate": [], "service": [""], "group": "Prometheus", "value": null, "text": "WARNING: n/a is Panel Title", "tags": ["grafana_folder=test"], "attributes": {"endsAt": "0001-01-01T00:00:00Z", "moreInfo": "<a href="http://prometheus:3000" target="_blank">Prometheus Graph", "startsAt": "2023-05-10T07:59:00Z", "externalUrl": "http://prometheus:3000/"}, "origin": "prometheus/-", "type": "prometheusAlert", "createTime": "2023-05-10T07:59:35.052Z", "timeout": 86400, "rawData": null, "customer": "AlertManager"}HTTP/1.1 200 OK
Date: Wed, 10 May 2023 07:59:35 GMT
Server: Apache/2.4.54 (Debian)
X-Powered-By: PHP/7.4.30
Vary: Accept-Encoding
Content-Encoding: gzip
Content-Length: 237
Keep-Alive: timeout=5, max=100
Connection: Keep-Alive
Content-Type: text/html; charset=UTF-8

Environment

• OS: Linux

• API version: alerta 9.0.0
  alerta client 8.5.2
  requests 2.28.1
  click 8.1.3

• Deployment: Docker

• For self-hosted, WSGI environment: nginx

• Database: Postgres

• Server config:
  Auth enabled? Yes
  Auth provider? LDAP

Additional context
I updated from an older version of alerta and this started to happen after the update.