feat(monitoring): add MongoDB Grafana dashboards
Add two MongoDB dashboards adapted for cozystack monitoring:
- mongodb-overview: command operations, connections, cursors,
document operations, queued operations, query efficiency,
scanned objects, write time, asserts, page faults
- mongodb-inmemory: WiredTiger InMemory cache details including
data size, capacity, transactions, sessions, pages, concurrency
tickets, cache eviction, document changes
Dashboards use ds_prometheus variable for datasource selection and
job-based service filtering compatible with Percona MongoDB exporter
metrics.
Signed-off-by: IvanHunters <xorokhotnikov@gmail.com>
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