map_values does not work if the from value is an integer

[jjmirks]

Describe the bug
map_values doesn't work if the "from" value is an integer

To Reproduce
Steps to reproduce the behavior:

1. Start a GCE VM with image Debian GNU/Linux 11
2. Install Ops Agent version 2.28.0 following the steps here
3. Customize the agent with configuration config.yaml and restart the agent
4. Run echo '{"severity":2}' >> /tmp/example

Expected behavior
In Logs Explorer I expect to see the log:
{"severity":2, "severityTest":"WARNING"}

Instead I see:
{"severity":2, "severityTest":2}

Additional information
I have tried version 1.22.0 as well and had the same result, I have also tried double-quoted and no-quoted map_values keys.

[braydonk]

Hi @jjmirks, thanks for bringing this to our attention. We are tracking this internally and will work on a fix.