Honor SCALE_PERIOD_MINS environment variable #2
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Korrigan
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Description of changes:
The lambda updates Cloudwatch alarms when scaling the stream, but does not honor the provided SCALE_PERIOD_MINS environment variable to configure alarm period (it has a hardcoded value of 5mn in updateAlarm).
I modified the updateAlarm function to accept a periodMins parameter, which is fetched from the SCALE_PERIOD_MINS environment variable with a fallback to 5mn already.
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