NAS-125841 / 23.10.1.1 / Gracefully handle case for aggregating disk temperatures when no temperatures have been retrieved (by Qubad786) (by bugclerk)

[bugclerk]

Problem

The skip_zero_values_in_aggregation flag is set to true in the disktemp graph. As a result, aggregation calculations are skipped if all the disk temperature values are zero. In some cases, temperature values might not exist, causing a key error when retrieving disk temperature from the temperature_agg API.

Solution

Now, the temperature_agg is retrieved safely, and default null values are returned to prevent the key error.

Original PR: #12806
Jira URL: https://ixsystems.atlassian.net/browse/NAS-125841

Original PR: #12808
Jira URL: https://ixsystems.atlassian.net/browse/NAS-125841

[bugclerk]

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