I created the number metric graph for lambda function like latency, the total number of invocation etc. I also created a custom metric filter which will give me errors and warnings count in logs for time range we specify.
Everything is working and result for the custom metric are correct. I don't understand the use of "period" column chart in the dashboard shown in the this cloudwatch single widget image. Can you explain the use of "period" and why it is there when we already have time-range like 1 H,3H, 1W