Alerts Fix, and adding object-store-accounts

[chrroberts-pure]

Fixed issue #81
Address enhancement #82

closes #81
closes #82

[chrroberts-pure]

needs changes, and docs - i'll work on these.

[chrroberts-pure]

# HELP purefb_object_store_accounts_space_bytes FlashBlade object store accounts space in bytes
# TYPE purefb_object_store_accounts_space_bytes gauge
purefb_object_store_accounts_space_bytes{id="71e66504-a6e6-4f77-a241-8b8e32a612de",name="aa-test",space="available_provisioned"} 0
purefb_object_store_accounts_space_bytes{id="71e66504-a6e6-4f77-a241-8b8e32a612de",name="aa-test",space="destroyed"} 0
purefb_object_store_accounts_space_bytes{id="71e66504-a6e6-4f77-a241-8b8e32a612de",name="aa-test",space="destroyed_virtual"} 0
purefb_object_store_accounts_space_bytes{id="71e66504-a6e6-4f77-a241-8b8e32a612de",name="aa-test",space="snapshots"} 0
purefb_object_store_accounts_space_bytes{id="71e66504-a6e6-4f77-a241-8b8e32a612de",name="aa-test",space="total_physical"} 80
purefb_object_store_accounts_space_bytes{id="71e66504-a6e6-4f77-a241-8b8e32a612de",name="aa-test",space="total_provisioned"} 0
purefb_object_store_accounts_space_bytes{id="71e66504-a6e6-4f77-a241-8b8e32a612de",name="aa-test",space="unique"} 80
purefb_object_store_accounts_space_bytes{id="71e66504-a6e6-4f77-a241-8b8e32a612de",name="aa-test",space="virtual"} 512

# HELP purefb_object_store_accounts_object_count FlashBlade object store accounts object count
# TYPE purefb_object_store_accounts_object_count gauge
purefb_object_store_accounts_object_count{id="71e66504-a6e6-4f77-a241-8b8e32a612de",name="aa-test"} 1

# HELP purefb_object_store_accounts_data_reduction_ratio FlashBlade object store accounts data reduction
# TYPE purefb_object_store_accounts_data_reduction_ratio gauge
purefb_object_store_accounts_data_reduction_ratio{id="71e66504-a6e6-4f77-a241-8b8e32a612de",name="aa-test"} 6.4

[chrroberts-pure]

To get this merged, I just need a new instrument and the three new metrics documented in https://github.com/PureStorage-OpenConnect/pure-fb-openmetrics-exporter/blob/main/specification/metrics/purefb-metrics.md

[chrroberts-pure]

I still need docs to get this merged

[chrroberts-pure]

I've added the docs scaffolding for now - good enough if we want to get a release in.

Tested on 4.5.0 and 4.3.8

[chrroberts-pure]

ready to merge once reviewed

[sdodsley]

Looks good