Add Prometheus metrics dashboard
Add a Grafana dashboard for Prometheus itself, to keep track of the data growth.
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ingestion_samples_per_second: rate(prometheus_tsdb_head_samples_appended_total[2h])
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bytes_per_sample: rate(prometheus_tsdb_compaction_chunk_size_sum[2h]) / rate(prometheus_tsdb_compaction_chunk_samples_sum[2h])