oleg_nenashev , more logs below. Looks like this is some ECS throttling issue
{"log":"com.amazonaws.services.ecs.model.AmazonECSException: Rate exceeded (Service: AmazonECS; Status Code: 400; Error Code: ThrottlingException; Request ID: 826a17c3-5046-4c80-af51-e9edeba79ed7)\n","stream":"stderr","time":"2020-05-15T15:00:23.521281981Z"}
{"log":"\u0009at com.amazonaws.http.AmazonHttpClient$RequestExecutor.handleErrorResponse(AmazonHttpClient.java:1799)\n","stream":"stderr","time":"2020-05-15T15:00:23.521286236Z"}
{"log":"\u0009at com.amazonaws.http.AmazonHttpClient$RequestExecutor.handleServiceErrorResponse(AmazonHttpClient.java:1383)\n","stream":"stderr","time":"2020-05-15T15:00:23.52128993Z"}
{"log":"\u0009at com.amazonaws.http.AmazonHttpClient$RequestExecutor.executeOneRequest(AmazonHttpClient.java:1359)\n","stream":"stderr","time":"2020-05-15T15:00:23.521293138Z"}
{"log":"\u0009at com.amazonaws.http.AmazonHttpClient$RequestExecutor.executeHelper(AmazonHttpClient.java:1139)\n","stream":"stderr","time":"2020-05-15T15:00:23.521296174Z"}
{"log":"\u0009at com.amazonaws.http.AmazonHttpClient$RequestExecutor.doExecute(AmazonHttpClient.java:796)\n","stream":"stderr","time":"2020-05-15T15:00:23.521298921Z"}
{"log":"\u0009at com.amazonaws.http.AmazonHttpClient$RequestExecutor.executeWithTimer(AmazonHttpClient.java:764)\n","stream":"stderr","time":"2020-05-15T15:00:23.521301735Z"}
{"log":"\u0009at com.amazonaws.http.AmazonHttpClient$RequestExecutor.execute(AmazonHttpClient.java:738)\n","stream":"stderr","time":"2020-05-15T15:00:23.521304416Z"}
{"log":"\u0009at com.amazonaws.http.AmazonHttpClient$RequestExecutor.access$500(AmazonHttpClient.java:698)\n","stream":"stderr","time":"2020-05-15T15:00:23.521307206Z"}
{"log":"\u0009at com.amazonaws.http.AmazonHttpClient$RequestExecutionBuilderImpl.execute(AmazonHttpClient.java:680)\n","stream":"stderr","time":"2020-05-15T15:00:23.521309918Z"}
{"log":"\u0009at com.amazonaws.http.AmazonHttpClient.execute(AmazonHttpClient.java:544)\n","stream":"stderr","time":"2020-05-15T15:00:23.521314666Z"}
{"log":"\u0009at com.amazonaws.http.AmazonHttpClient.execute(AmazonHttpClient.java:524)\n","stream":"stderr","time":"2020-05-15T15:00:23.521318806Z"}
{"log":"\u0009at com.amazonaws.services.ecs.AmazonECSClient.doInvoke(AmazonECSClient.java:4238)\n","stream":"stderr","time":"2020-05-15T15:00:23.521322291Z"}
{"log":"\u0009at com.amazonaws.services.ecs.AmazonECSClient.invoke(AmazonECSClient.java:4205)\n","stream":"stderr","time":"2020-05-15T15:00:23.521326029Z"}
{"log":"\u0009at com.amazonaws.services.ecs.AmazonECSClient.invoke(AmazonECSClient.java:4194)\n","stream":"stderr","time":"2020-05-15T15:00:23.521329318Z"}
{"log":"\u0009at com.amazonaws.services.ecs.AmazonECSClient.executeRegisterTaskDefinition(AmazonECSClient.java:2923)\n","stream":"stderr","time":"2020-05-15T15:00:23.521333095Z"}
{"log":"\u0009at com.amazonaws.services.ecs.AmazonECSClient.registerTaskDefinition(AmazonECSClient.java:2893)\n","stream":"stderr","time":"2020-05-15T15:00:23.521336939Z"}
{"log":"\u0009at com.cloudbees.jenkins.plugins.amazonecs.ECSTaskTemplate.setOwer(ECSTaskTemplate.java:470)\n","stream":"stderr","time":"2020-05-15T15:00:23.521340538Z"}
{"log":"\u0009at com.cloudbees.jenkins.plugins.amazonecs.ECSCloud.\u003cinit\u003e(ECSCloud.java:110)\n","stream":"stderr","time":"2020-05-15T15:00:23.521344499Z"}
{"log":"\u0009at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)\n","stream":"stderr","time":"2020-05-15T15:00:23.521349318Z"}
{"log":"\u0009at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)\n","stream":"stderr","time":"2020-05-15T15:00:23.52135307Z"}
{"log":"\u0009at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)\n","stream":"stderr","time":"2020-05-15T15:00:23.521356995Z"}
{"log":"\u0009at java.lang.reflect.Constructor.newInstance(Constructor.java:423)\n","stream":"stderr","time":"2020-05-15T15:00:23.521361249Z"}
{"log":"\u0009at org.kohsuke.stapler.RequestImpl.invokeConstructor(RequestImpl.java:529)\n","stream":"stderr","time":"2020-05-15T15:00:23.521365025Z"}
{"log":"\u0009at org.kohsuke.stapler.RequestImpl.instantiate(RequestImpl.java:784)\n","stream":"stderr","time":"2020-05-15T15:00:23.521369426Z"}
{"log":"\u0009at org.kohsuke.stapler.RequestImpl.access$200(RequestImpl.java:83)\n","stream":"stderr","time":"2020-05-15T15:00:23.521376726Z"}
{"log":"\u0009at org.kohsuke.stapler.RequestImpl$TypePair.convertJSON(RequestImpl.java:678)\n","stream":"stderr","time":"2020-05-15T15:00:23.521380483Z"}
{"log":"\u0009at org.kohsuke.stapler.RequestImpl.bindJSON(RequestImpl.java:478)\n","stream":"stderr","time":"2020-05-15T15:00:23.521384282Z"}
{"log":"\u0009at org.kohsuke.stapler.RequestImpl.bindJSON(RequestImpl.java:474)\n","stream":"stderr","time":"2020-05-15T15:00:23.521388194Z"}
Apologies, I am not sure which component this is part of, hence assigned to ec2-plugin and jcloud.