vector: Memory leak while using kubernetes_logs source

Vector Version

0.11.1-alpine

running on Kubernetes

v1.19.3

Vector Configuration File

    [sources.kube_logs_1]
      type = "kubernetes_logs"
      exclude_paths_glob_patterns = ["**/calico-node/**"]
      annotation_fields.container_name = "container_name"
      annotation_fields.container_image = "container_image"
      annotation_fields.pod_ip = "pod_ip"
      annotation_fields.pod_name = "pod_name"
      annotation_fields.pod_namespace = "namespace_name"
      annotation_fields.pod_node_name = "pod_node_name"
      annotation_fields.pod_uid = "pod_uid"

    [transforms.kube_logs_remapped]
      type = "remap"
      inputs = ["kube_logs_1"]
      source = '''
      .full_message = .message
      .message = "pod_stderr_stdout"
      .source = .pod_node_name
      del(.file)
      del(.pod_node_name)
      del(.kubernetes)
      '''
    [transforms.add_region_fields_to_logs]
      type = "add_fields"
      inputs = ["vector_1", "kube_logs_remapped"]
      fields.env = "<%= @environment %>"
      fields.region = "<%= @region %>"
      fields.region_domain = "<%= @region_domain %>"

    [sinks.graylog_gelf]
      type = "http"
      inputs = ["add_region_fields_to_logs"]
      uri = xxx
      encoding.codec = "ndjson"
      compression = "none"
      batch.max_bytes = 4096
      #batch.timeout_secs = 1
      #buffer.max_events = 1
      #buffer.type = "memory"
      tls.verify_hostname = false

Debug Output

https://gist.github.com/karlmartink/095979bec3dea7d91430c91a842d3927

Expected Behavior

Stable memory usage or slight increase until some maximum level is increased.

Actual Behavior

Containers memory + cpu usage is slowly growing overtime until maximum limits are reached and service is killed while processed events remain the same.

Example Data

POD CPU and Memory usage

Processed events

Additional Context

I am using vector to mostly collect Kubernetes logs and manipulate them with some transforms. After that they get forwarded to graylog via HTTP to GELF input.