First reading always comes with null data and wrong timestamp

[bahadiri]

Snap daemon version (use snapteld -v): snapteld version 2.0.0

Environment:

• Cloud provider or hardware configuration: System 76 Gazelle
• OS (e.g. from /etc/os-release): Ubuntu 16.04.3 LTS
• Kernel (e.g. uname -a): 4.10.0-42-generic
• Relevant tools (e.g. plugins used with Snap): Intel PCM
• Others (e.g. deploying with Ansible): N/A

What happened:

1. First reading always come with a weird timestamp. and null data.

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},{"timestamp":"0000-12-31T15:47:32-08:12","namespace":"/intel/pcm/System/L3MPI","data":null,"unit":"","tags":{"plugin_running_on":"bahadir"},"version":11},{"timestamp":"0000-12-31T15:47:32-08:12","namespace":"/intel/pcm/System/INST","data":null,"unit":"","tags":{"plugin_running_on":"bahadir"},"version":11},{"timestamp":"0000-12-31T15:47:32-08:12","namespace":"/intel/pcm/System/IPC","data":null,"unit":"","tags":{"plugin_running_on":"bahadir"},"version":11},{"timestamp":"0000-12-31T15:47:32-08:12","namespace":"/intel/pcm/System/L2HIT","data":null,"unit":"","tags":{"plugin_running_on":"bahadir"},"version":11},{"timestamp":"0000-12-31T15:47:32-08:12","namespace":"/intel/pcm/System/PhysIPC","data":null,"unit":"","tags":{"plugin_running_on":"bahadir"},"version":11},{"timestamp":"0000-12-31T15:47:32-08:12","namespace":"/intel/pcm/System/PhysIPC%","data":null,"unit":"","tags":{"plugin_running_on":"bahadir"},"version":11},{"timestamp":"0000-12-31T15:47:32-08:12","namespace":"/intel/pcm/System/AFREQ","data":null,"unit":"","tags":{"plugin_running_on":"bahadir"},"version":11},{"timestamp":"0000-12-31T15:47:32-08:12","namespace":"/intel/pcm/System/L2MPI","data":null,"unit":"","tags":{"plugin_running_on":"bahadir"},"version":11},{"timestamp":"0000-12-31T15:47:32-08:12","namespace":"/intel/pcm/System/WRITE","data":null,"unit":"","tags":{"plugin_running_on":"bahadir"},"version":11},{"timestamp":"0000-12-31T15:47:32-08:12","namespace":"/intel/pcm/System/INSTnom","data":null,"unit":"","tags":{"plugin_running_on":"bahadir"},"version":11},{"timestamp":"0000-12-31T15:47:32-08:12","namespace":"/intel/pcm/System/INSTnom%","data":null,"unit":"","tags":{"plugin_running_on":"bahadir"},"version":11},{"timestamp":"0000-12-31T15:47:32-08:12","namespace":"/intel/pcm/System/FREQ","data":null,"unit":"","tags":{"plugin_running_on":"bahadir"},"version":11},{"timestamp":"0000-12-31T15:47:32-08:12","namespace":"/intel/pcm/System/L2MISS","data":null,"unit":"","tags":{"plugin_running_on":"bahadir"},"version":11},{"timestamp":"0000-12-31T15:47:32-08:12","namespace":"/intel/pcm/System/READ","data":null,"unit":"","tags":{"plugin_running_on":"bahadir"},"version":11},{"timestamp":"0000-12-31T15:47:32-08:12","namespace":"/intel/pcm/System/ACYC","data":null,"unit":"","tags":{"plugin_running_on":"bahadir"},"version":11},{"timestamp":"0000-12-31T15:47:32-08:12","namespace":"/intel/pcm/System/TIME_ticks","data":null,"unit":"","tags":{"plugin_running_on":"bahadir"},"version":11},{"timestamp":"0000-12-31T15:47:32-08:12","namespace":"/intel/pcm/System_Core_C-States/C0res%","data":null,"unit":"","tags":{"plugin_running_on":"bahadir"},"version":11},{"timestamp":"0000-12-31T15:47:32-08:12","namespace":"/intel/pcm/System_Core_C-States/C1res%","data":null,"unit":"","tags":{"plugin_running_on":"bahadir"},"version":11},{"timestamp":"0000-12-31T15:47:32-08:12","namespace":"/intel/pcm/System_Core_C-States/C3res%","data":null,"unit":"","tags":{"plugin_running_on":"bahadir"},"version":11},{"timestamp":"0000-12-31T15:47:32-08:12","namespace":"/intel/pcm/System_Core_C-States/C6res%","data":null,"unit":"","tags":{"plugin_running_on":"bahadir"},"version":11},{"timestamp":"0000-12-31T15:47:32-08:12","namespace":"/intel/pcm/System_Core_C-States/C7res%","data":null,"unit":"","tags":{"plugin_running_on":"bahadir"},"version":11}]

What you expected to happen:
Normal data and timestamp

Steps to reproduce it (as minimally and precisely as possible):

1. Start Snap
2. Load pcm plugin as described
3. Start a task to collect data

Anything else do we need to know (e.g. issue happens only occasionally):

[PatrykMatyjasek]

It is caused by pcm tool. Initialization take 2-3 seconds, and resets counters. It results that first data collection is corrupted.

[bahadiri]

Ok we’re cleaning it from the file. But maybe plugin can drop it for accuracy.