Cherry-pick #15649 to 7.x: [metricbeat] Add divide by zero check to docker/diskio

[fearful-symmetry]

Cherry-pick of PR #15649 to 7.x branch. Original message:

Currently dealing with #15549, which involves a handful of NaN errors. I'm hoping this is one of the NaN cases. If we get invalid data from upstream, it's possible for this to be 0.

[elasticmachine]

💚 Build Succeeded

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Build stats

• Build Cause: [Pull request Cherry-pick #15649 to 7.x: [metricbeat] Add divide by zero check to docker/diskio #15706 updated]

• Start Time: 2020-05-08T16:59:27.516+0000

• Duration: 99 min 29 sec (5968536)

• Commit: 43adbcf

Test stats 🧪

Test	Results
Failed	0
Passed	2323
Skipped	560
Total	2883

Steps errors

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• Name: Report to Codecov

  • Description: curl -sSLo codecov https://codecov.io/bash for i in auditbeat filebeat heartbeat libbeat metricbeat packetbeat winlogbeat journalbeat do FILE="${i}/build/coverage/full.cov" if [ -f "${FILE}" ]; then bash codecov -f "${FILE}" fi done

  • Result: FAILURE

  • Duration: 2 min 22 sec

  • Start Time: 2020-05-08T18:36:10.949+0000

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