infra/logs: adding maintenance logs directory and 2020-12-02 log

infra/logs/README.md

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+# Maintenance logs
+
+This directory contains maintenance logs (without any sensitive
+information redacted) for each of the machines that is configured and
+controlled via `libkookie`.
+
+Maintenance is considered anything that goes beyond rebuilding a
+system via the standard build process, by running manual commands to
+fix things, or touching the hardware for some reason.
+

infra/logs/gaia/2020-12-02-swap-errored-disk.md

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+# 2020-12-02
+
+On `gaia` one of the disks in my encrypted data pool has been throwing
+CKSUM errors.  So I decided to swap the disk.  All disks in the
+`datacore` array are 6TB capacity.  I ordered two cold spares of the
+same make a few weeks ago.  Today I'm taking down the server to swap
+the drives.
+
+|                 | Device path                              |
+|-----------------|------------------------------------------|
+| Removed drive   | `/dev/disk/by-id/wwn-0x5000c500c3320a74` |
+| Installed drive | `/dev/disk/by-id/wwn-0x5000c500c62458d6` |
+
+Resilvering was started at `Wed Dec 2 11:25:49 2020`.  The ETA is
+estimated to be `3 days`.  No noteworthy events occured.
+
+Maintenance completed at `Wed Dec 2 ~11:30:00 2020`.
+