compat container stats endpoint does not stream if container is not yet started

[lukasmrtvy]

Is this a BUG REPORT or FEATURE REQUEST? (leave only one on its own line)

/kind bug

Description
Container stats ( compat ) endpoint does not stream empty stats if the container is not yet started, while this is working for Docker stats endpoint.

Related: #14580

Steps to reproduce the issue:

1. id=$(podman create -t nginx)

2. curl -X GET --unix-socket /run/podman/podman.sock "http://d/containers/$id/stats?stream=true"

Describe the results you received:
200 response, stream is not opened...

Describe the results you expected:
Stream is opened...

{"read":"0001-01-01T00:00:00Z","preread":"0001-01-01T00:00:00Z","pids_stats":{},"blkio_stats":{"io_service_bytes_recursive":null,"io_serviced_recursive":null,"io_queue_recursive":null,"io_service_time_recursive":null,"io_wait_time_recursive":null,"io_merged_recursive":null,"io_time_recursive":null,"sectors_recursive":null},"num_procs":0,"storage_stats":{},"cpu_stats":{"cpu_usage":{"total_usage":0,"usage_in_kernelmode":0,"usage_in_usermode":0},"throttling_data":{"periods":0,"throttled_periods":0,"throttled_time":0}},"precpu_stats":{"cpu_usage":{"total_usage":0,"usage_in_kernelmode":0,"usage_in_usermode":0},"throttling_data":{"periods":0,"throttled_periods":0,"throttled_time":0}},"memory_stats":{},"name":"/nice_mendeleev","id":"53a0a73b0b122d7bca9f011f0532ddc756c620a808fdde30be8a05417f09cd2e"}
{"read":"0001-01-01T00:00:00Z","preread":"0001-01-01T00:00:00Z","pids_stats":{},"blkio_stats":{"io_service_bytes_recursive":null,"io_serviced_recursive":null,"io_queue_recursive":null,"io_service_time_recursive":null,"io_wait_time_recursive":null,"io_merged_recursive":null,"io_time_recursive":null,"sectors_recursive":null},"num_procs":0,"storage_stats":{},"cpu_stats":{"cpu_usage":{"total_usage":0,"usage_in_kernelmode":0,"usage_in_usermode":0},"throttling_data":{"periods":0,"throttled_periods":0,"throttled_time":0}},"precpu_stats":{"cpu_usage":{"total_usage":0,"usage_in_kernelmode":0,"usage_in_usermode":0},"throttling_data":{"periods":0,"throttled_periods":0,"throttled_time":0}},"memory_stats":{},"name":"/nice_mendeleev","id":"53a0a73b0b122d7bca9f011f0532ddc756c620a808fdde30be8a05417f09cd2e"}
{"read":"0001-01-01T00:00:00Z","preread":"0001-01-01T00:00:00Z","pids_stats":{},"blkio_stats":{"io_service_bytes_recursive":null,"io_serviced_recursive":null,"io_queue_recursive":null,"io_service_time_recursive":null,"io_wait_time_recursive":null,"io_merged_recursive":null,"io_time_recursive":null,"sectors_recursive":null},"num_procs":0,"storage_stats":{},"cpu_stats":{"cpu_usage":{"total_usage":0,"usage_in_kernelmode":0,"usage_in_usermode":0},"throttling_data":{"periods":0,"throttled_periods":0,"throttled_time":0}},"precpu_stats":{"cpu_usage":{"total_usage":0,"usage_in_kernelmode":0,"usage_in_usermode":0},"throttling_data":{"periods":0,"throttled_periods":0,"throttled_time":0}},"memory_stats":{},"name":"/nice_mendeleev","id":"53a0a73b0b122d7bca9f011f0532ddc756c620a808fdde30be8a05417f09cd2e"}

Additional information you deem important (e.g. issue happens only occasionally):
Reproducer for Docker:

id=$(docker create -t nginx)
curl  -X GET --unix-socket /var/run/docker.sock "http://d/containers/$id/stats?stream=true"

Output of podman version:

Client:       Podman Engine
Version:      4.2.0
API Version:  4.2.0
Go Version:   go1.18.4
Built:        Thu Aug 11 14:42:17 2022
OS/Arch:      linux/amd64

Output of podman info:

host:
  arch: amd64
  buildahVersion: 1.27.0
  cgroupControllers:
  - cpuset
  - cpu
  - io
  - memory
  - hugetlb
  - pids
  - misc
  cgroupManager: systemd
  cgroupVersion: v2
  conmon:
    package: conmon-2.1.0-2.fc36.x86_64
    path: /usr/bin/conmon
    version: 'conmon version 2.1.0, commit: '
  cpuUtilization:
    idlePercent: 92.99
    systemPercent: 1.91
    userPercent: 5.09
  cpus: 16
  distribution:
    distribution: fedora
    variant: coreos
    version: "36"
  eventLogger: journald
  hostname: ip-10-2-22-82
  idMappings:
    gidmap: null
    uidmap: null
  kernel: 5.18.18-200.fc36.x86_64
  linkmode: dynamic
  logDriver: journald
  memFree: 123904901120
  memTotal: 133529747456
  networkBackend: netavark
  ociRuntime:
    name: crun
    package: crun-1.5-1.fc36.x86_64
    path: /usr/bin/crun
    version: |-
      crun version 1.5
      commit: 54ebb8ca8bf7e6ddae2eb919f5b82d1d96863dea
      spec: 1.0.0
      +SYSTEMD +SELINUX +APPARMOR +CAP +SECCOMP +EBPF +CRIU +YAJL
  os: linux
  remoteSocket:
    exists: true
    path: /run/podman/podman.sock
  security:
    apparmorEnabled: false
    capabilities: CAP_CHOWN,CAP_DAC_OVERRIDE,CAP_FOWNER,CAP_FSETID,CAP_KILL,CAP_NET_BIND_SERVICE,CAP_SETFCAP,CAP_SETGID,CAP_SETPCAP,CAP_SETUID,CAP_SYS_CHROOT
    rootless: false
    seccompEnabled: true
    seccompProfilePath: /usr/share/containers/seccomp.json
    selinuxEnabled: true
  serviceIsRemote: false
  slirp4netns:
    executable: /usr/bin/slirp4netns
    package: slirp4netns-1.2.0-0.2.beta.0.fc36.x86_64
    version: |-
      slirp4netns version 1.2.0-beta.0
      commit: 477db14a24ff1a3de3a705e51ca2c4c1fe3dda64
      libslirp: 4.6.1
      SLIRP_CONFIG_VERSION_MAX: 3
      libseccomp: 2.5.3
  swapFree: 0
  swapTotal: 0
  uptime: 1h 25m 45.00s (Approximately 0.04 days)
plugins:
  authorization: null
  log:
  - k8s-file
  - none
  - passthrough
  - journald
  network:
  - bridge
  - macvlan
  volume:
  - local
registries:
  search:
  - docker.io
store:
  configFile: /usr/share/containers/storage.conf
  containerStore:
    number: 34
    paused: 0
    running: 0
    stopped: 34
  graphDriverName: overlay
  graphOptions:
    overlay.mountopt: nodev,metacopy=on
  graphRoot: /var/lib/containers/storage
  graphRootAllocated: 1098974756864
  graphRootUsed: 12981538816
  graphStatus:
    Backing Filesystem: xfs
    Native Overlay Diff: "false"
    Supports d_type: "true"
    Using metacopy: "true"
  imageCopyTmpDir: /var/tmp
  imageStore:
    number: 11
  runRoot: /run/containers/storage
  volumePath: /var/lib/containers/storage/volumes
version:
  APIVersion: 4.2.0
  Built: 1660228937
  BuiltTime: Thu Aug 11 14:42:17 2022
  GitCommit: ""
  GoVersion: go1.18.4
  Os: linux
  OsArch: linux/amd64
  Version: 4.2.0

Package info (e.g. output of rpm -q podman or apt list podman or brew info podman):

podman-4.2.0-2.fc36.x86_64

Have you tested with the latest version of Podman and have you checked the Podman Troubleshooting Guide? (https://github.com/containers/podman/blob/main/troubleshooting.md)

Yes

Additional environment details (AWS, VirtualBox, physical, etc.):
AWS EC2 instance, /var/lib/containers/storage/ mounted from EBS running Fedora CoreOS 36.20220820.3.0

[github-actions]

A friendly reminder that this issue had no activity for 30 days.

[rhatdan]

@mheon PTAL

[github-actions]

A friendly reminder that this issue had no activity for 30 days.

[rhatdan]

@mheon any chance to work on this one?

[mheon]

Not yet

[github-actions]

A friendly reminder that this issue had no activity for 30 days.

[github-actions]

A friendly reminder that this issue had no activity for 30 days.