Calculate Max over time on Sum function

[darshilsaraiya]

I am running prometheus in my kubernetes cluster.
I have the following system in kubernetes:

I have 4 nodes. I want to calculate free memory. I want to have the summation of those four nodes. Then I want to find the maximum over 1 day. So, for example,

at time=t1
node1: 500 MB
node2: 600 MB
node3: 200 MB
node4: 300 MB
Total = 1700 MB

at time=t2
node1: 400 MB
node2: 700 MB
node3: 100 MB
node4: 200 MB
Total = 1300 MB

at time=t3
node1: 600 MB
node2: 800 MB
node3: 1200 MB
node4: 1300 MB
Total = 3900 MB

at time=t4
node1: 100 MB
node2: 200 MB
node3: 300 MB
node4: 400 MB
Total = 1000 MB

So, The answer to my query should be 3900 MB. I am not able to do max_over_time for the sum.

[brian-brazil]

Usage questions should be asked at https://groups.google.com/forum/#!aboutgroup/prometheus-users

[lock]

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