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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

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  • Hi, if the response below answered your question please upvote and accept it. That's the ServerFault way of saying Thanks for the time someone took to help you :) – MLu Feb 19 '19 at 20:51
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Period in metrics displayed as Number simply describe how far in the past you are collecting the stats. For other display modes, e.g. Line or Stack the period is the time between each displayed data point. So on one graph you can have 3 hours of data with 5 min period which will give you 36 points on the graph. In Number display you'll simply see the last data point with stats collected over the last Period.

In your screenshot - on the first line you are calculating a Sum of all your Lambda errors over the last 30 days. If you change the Period to e.g. 7 days the number on the dashboard will show the Sum of the Lambda errors over the last 7 days.

Hope that helps :)

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  • Thanks for the answer. Still I’ve one doubt. So if I make graph with 5min and 7 days period for time range of 7 days(sum of lambda errors). will it show me the same result? – Aniket patel Dec 30 '18 at 3:04

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