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docs: clarify observability metrics and migration to plugin-based ones (#621)

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Improved the "Observability" section to better describe the Prometheus
metrics exposed by the Barman Cloud Plugin via the instance manager.
Added a mapping table in the "Verify your metrics" step to show the
transition from in-core metrics (`cnpg_collector_*`) to the new
plugin-based metrics (`barman_cloud_cloudnative_pg_io_*`).

Closes #473
Closes cloudnative-pg/cloudnative-pg#8902

Signed-off-by: Gabriele Bartolini <gabriele.bartolini@enterprisedb.com>
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1
.wordlist.txt
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@ -33,6 +33,7 @@ ObjectMeta
ObjectStore
ObjectStoreSpec
ObjectStoreStatus
Observability
PITR
PoR
PostgreSQL

15
web/docs/migration.md
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@ -257,3 +257,18 @@ spec:
barmanObjectName: minio-eu
serverName: pg-eu
```
## Step 5: Verify your metrics
When migrating from the in-core solution to the plugin-based approach, you need
to monitor a different set of metrics, as described in the
["Observability"](observability.md) section.
The table below summarizes the name changes between the old in-core metrics and
the new plugin-based ones:
| Old metric name | New metric name |
| ------------------------------------------------ | ---------------------------------------------------------------- |
| `cnpg_collector_last_failed_backup_timestamp` | `barman_cloud_cloudnative_pg_io_last_failed_backup_timestamp` |
| `cnpg_collector_last_available_backup_timestamp` | `barman_cloud_cloudnative_pg_io_last_available_backup_timestamp` |
| `cnpg_collector_first_recoverability_point` | `barman_cloud_cloudnative_pg_io_first_recoverability_point` |

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web/docs/observability.md Normal file
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@ -0,0 +1,24 @@
---
sidebar_position: 55
---
# Observability
<!-- SPDX-License-Identifier: CC-BY-4.0 -->
The Barman Cloud Plugin exposes the following metrics through the native
Prometheus exporter of the instance manager:
- `barman_cloud_cloudnative_pg_io_last_failed_backup_timestamp`:
the UNIX timestamp of the most recent failed backup.
- `barman_cloud_cloudnative_pg_io_last_available_backup_timestamp`:
the UNIX timestamp of the most recent successfully available backup.
- `barman_cloud_cloudnative_pg_io_first_recoverability_point`:
the UNIX timestamp representing the earliest point in time from which the
cluster can be recovered.
These metrics supersede the previously available in-core metrics that used the
`cnpg_collector` prefix. The new metrics are exposed under the
`barman_cloud_cloudnative_pg_io` prefix instead.