Alerta not recieving alerts from Kapacitor ... "ts=2021-05-18T16:54:05.015-07:00 lvl=error msg="failed to send event to Alerta" service=alerta task=chronograf-v1-06b02fe5-0ec7-4cd6-a169-958efbb13fbd err="key 'com.amazonaws.ecs.cluster' must not contain '.'"

Trying to get alerts from Kapacitor to Alerta are failing. Any help much appreciated.

Errors we seeing:

ts=2021-05-18T17:39:25.882-07:00 lvl=error msg="failed to send event to Alerta" service=alerta task=chronograf-v1-06b02fe5-0ec7-4cd6-a169-958efbb13fbd err="key 'com.amazonaws.ecs.cluster' must not contain '.'"
ts=2021-05-18T17:39:30.357-07:00 lvl=error msg="failed to send event to Alerta" service=alerta task=chronograf-v1-06b02fe5-0ec7-4cd6-a169-958efbb13fbd err="key 'com.amazonaws.ecs.cluster' must not contain '.'"
ts=2021-05-18T17:39:30.470-07:00 lvl=error msg="failed to send event to Alerta" service=alerta task=chronograf-v1-06b02fe5-0ec7-4cd6-a169-958efbb13fbd err="key 'com.amazonaws.ecs.cluster' must not contain '.'"
ts=2021-05-18T17:39:30.667-07:00 lvl=error msg="failed to send event to Alerta" service=alerta task=chronograf-v1-06b02fe5-0ec7-4cd6-a169-958efbb13fbd err="key 'com.amazonaws.ecs.cluster' must not contain '.'"
ts=2021-05-18T17:39:30.726-07:00 lvl=error msg="failed to send event to Alerta" service=alerta task=chronograf-v1-06b02fe5-0ec7-4cd6-a169-958efbb13fbd err="key 'com.amazonaws.ecs.cluster' must not contain '.'"

URL for relevant page?

http://192.168.0.126:8888/sources/18/kapacitors/55/edit

What products and version are you using?

[root@aws-hub-kapacitor-01 ~]# kapacitor version
Kapacitor OSS 1.5.9 (git: HEAD 06a16e51ceb5b7086b3b855969c3f93532da1550)
[root@aws-hub-kapacitor-01 ~]#

root@aws-hub-alerta-01:~# alerta version
alerta 8.5.0
alerta client 8.5.0
requests 2.22.0
click 7.0

Where did you look before opening the issue?

https://alerta.io/
https://docs.influxdata.com/chronograf/v1.8/guides/configuring-alert-endpoints/
https://www.influxdata.com/blog/monitoring-alerting-in-influxdb-cloud-2-0/
https://docs.alerta.io/en/latest/cli.html#id13

Start with the Kapacitor-to-Alerta endpoint configuration and the reported Kapacitor 1.5.9 and Alerta 8.5.0 versions. Reproduce or trace the "com.amazonaws.ecs.cluster" key error; done means alerts are delivered to Alerta without the key-validation failure.