Increase the buckets for compaction duration (#8342)

We're seeing compactions that are taking hours in Cortex which this is
missing. I know while it is not common in Prometheus, I am pretty sure
there are setups where compaction takes longer than 512s. On our own
Prometheus the average compaction duration is 566s.
Signed-off-by: NGoutham Veeramachaneni <gouthamve@gmail.com>

tsdb/compact.go

@@ -111,7 +111,7 @@ func newCompactorMetrics(r prometheus.Registerer) *compactorMetrics {
 	m.duration = prometheus.NewHistogram(prometheus.HistogramOpts{
 		Name:    "prometheus_tsdb_compaction_duration_seconds",
 		Help:    "Duration of compaction runs",
-		Buckets: prometheus.ExponentialBuckets(1, 2, 10),
+		Buckets: prometheus.ExponentialBuckets(1, 2, 14),
 	})
 	m.chunkSize = prometheus.NewHistogram(prometheus.HistogramOpts{
 		Name:    "prometheus_tsdb_compaction_chunk_size_bytes",