Unable to use cloudtrail based lambda execute for EBS volumes

[gravops]

I am using below policy to trigger a lambda on behalf of cloud trail event:
`policies:

• name: custodian-ebs-monitor-tag
  resource: ebs
  mode:
  type: cloudtrail
  role: CustodianLamdaRole
  events:
  - source: 'ec2.amazonaws.com'
  event: 'AttachVolume'
  ids: 'requestParameters.volumeId'
  filters:
  • "tag:custodian": present
    actions:
  • type: mark-for-op
    op: delete
    days: 30`

while the lambda I am running, getting below error:

Test Event Name
(unsaved) test event

Response
{
"errorMessage": "name 'event' is not defined",
"errorType": "NameError",
"requestId": "",
"stackTrace": [
" File "/var/lang/lib/python3.11/importlib/init.py", line 126, in import_module\n return _bootstrap._gcd_import(name[level:], package, level)\n",
" File "", line 1204, in _gcd_import\n",
" File "", line 1176, in _find_and_load\n",
" File "", line 1147, in _find_and_load_unlocked\n",
" File "", line 690, in _load_unlocked\n",
" File "", line 940, in exec_module\n",
" File "", line 241, in _call_with_frames_removed\n",
" File "/var/task/custodian_policy.py", line 7, in \n event_name = event['detail']['eventName']\n"
]
}

Function Logs
[ERROR] NameError: name 'event' is not defined
Traceback (most recent call last):
  File "/var/lang/lib/python3.11/importlib/init.py", line 126, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
  File "", line 1204, in _gcd_import
  File "", line 1176, in _find_and_load
  File "", line 1147, in _find_and_load_unlocked
  File "", line 690, in _load_unlocked
  File "", line 940, in exec_module
  File "", line 241, in _call_with_frames_removed
  File "/var/task/custodian_policy.py", line 7, in
    event_name = event['detail']['eventName']INIT_REPORT Init Duration: 561.46 ms Phase: init Status: error Error Type: Runtime.ExitError
[ERROR] NameError: name 'event' is not defined
Traceback (most recent call last):
  File "/var/lang/lib/python3.11/importlib/init.py", line 126, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
  File "", line 1204, in _gcd_import
  File "", line 1176, in _find_and_load
  File "", line 1147, in _find_and_load_unlocked
  File "", line 690, in _load_unlocked
  File "", line 940, in exec_module
  File "", line 241, in _call_with_frames_removed
  File "/var/task/custodian_policy.py", line 7, in
    event_name = event['detail']['eventName']INIT_REPORT Init Duration: 769.42 ms Phase: invoke Status: error Error Type: Runtime.ExitError
START RequestId: 32488f0b-ec83-4552-a45e-c238f7060c4b Version: $LATEST
Unknown application error occurred
Runtime.Unknown
END RequestId: 32488f0b-ec83-4552-a45e-c238f7060c4b
REPORT RequestId: 32488f0b-ec83-4552-a45e-c238f7060c4b Duration: 784.36 ms Billed Duration: 785 ms Memory Size: 1024 MB Max Memory Used: 34 MB

Request ID
32488f0b-ec83-4552-a45e-c238f7060c4b

Any help on this please?