//Frame dictionary
{"FrameId1": "java.lang.blah.blah:80", "...": "..."}

//Syscall dictionary
{"SycallId1": "open()", "...": "..."}

//Data model for a unique backtrace in off-cpu stack sample tree
[
  "ctx_switch_count",
  "voluntary_count",
  "migrated_count",
  ["latency_mean", "..."],
  ["wakeup_lag_mean", "..."],
  {
    "syscallId1": [
      "syscall_count",
      ["latency_mean", "..."],
      ["wakeup_lag_mean", "..."]
    ],
    "...": []
  }
]