Relevant telegraf.conf:

    [agent]
      collection_jitter = "10s"
      debug = true
      flush_interval = "60s"
      flush_jitter = "10s"
      hostname = "$HOSTNAME"
      interval = "60s"
      logfile = ""
      metric_batch_size = 1000
      metric_buffer_limit = 10000
      omit_hostname = false
      precision = ""
      quiet = false
      round_interval = true

    [[outputs.file]]
      files = ["results.txt"]
    [[inputs.kube_inventory]]
      namespace = ""
      url = "https://kubernetes.default"
      insecure_skip_verify = true
      response_timeout = "10s"
      resource_exclude = ["persistentvolumes", "persistentvolumeclaims"]
      selector_include = []
      selector_exclude = []
      fielddrop = ["terminated_reason"]

System info:

Kubernetes v1.18.14
helm.sh/chart: telegraf-1.8.4
image: telegraf:1.19.1

Steps to reproduce:

1. helm upgrade --install my-release influxdata/telegraf (https://artifacthub.io/packages/helm/influxdata/telegraf)
2. Modify the telegraf deployment to include resource requests and limits

          resources:
            limits:
              cpu: 4192m
              memory: 4Gi
            requests:
              cpu: 4192m
              memory: 4Gi

3. Deploy the above telegraf configuration with the telegraf deployment

Expected behavior:

I expect to see correct outputs for all metrics generated by the kube_inventory input on results.txt

Actual behavior:

Some of the kube_inventory metrics report correctly, but not resource-based metrics (e.g. kubernetes_node.allocatable_*, kubernetes_node.capacity_*, kubernetes_pod_container.resource_*). In the pod logs, I see many lines that contain the following:

2021-07-21T16:37:58Z D! [inputs.kube_inventory] failed to parse quantity: quantities must match the regular expression '^([+-]?[0-9.]+)([eEinumkKMGTP]*[-+]?[0-9]*)$'
2021-07-21T16:37:58Z D! [inputs.kube_inventory] failed to parse quantity: quantities must match the regular expression '^([+-]?[0-9.]+)([eEinumkKMGTP]*[-+]?[0-9]*)$'
2021-07-21T16:37:58Z D! [inputs.kube_inventory] failed to parse quantity: quantities must match the regular expression '^([+-]?[0-9.]+)([eEinumkKMGTP]*[-+]?[0-9]*)$'

Here is a sample line from results.txt:

readiness=ready,state=running resource_requests_memory_bytes=0i,resource_limits_millicpu_units=0i,resource_limits_memory_bytes=0i,restarts_total=8i,state_code=0i,resource_requests_millicpu_units=0i

Additional info:

I've tried different values for limits and requests, such as cpu: "4" or memory: 4000Mi with no luck.