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Expose prometheus_tsdb_lowest_timestamp metric (#363) 

* Expose prometheus_tsdb_start_time_seconds metric

Signed-off-by: Bob Shannon <bshannon@palantir.com>

* Search for block with smallest minTime

Signed-off-by: Bob Shannon <bshannon@palantir.com>

* PR comments

Signed-off-by: Bob Shannon <bshannon@palantir.com>

* PR comment: Make metric name more accurate

Signed-off-by: Bob Shannon <bshannon@palantir.com>
This commit is contained in:
Bob Shannon 2018-09-14 08:07:45 -04:00 committed by Goutham Veeramachaneni
parent 9be883670e
commit cb7f320d42
1 changed files with 13 additions and 0 deletions
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13
db.go
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@ -125,6 +125,7 @@ type dbMetrics struct {
compactionsTriggered prometheus.Counter
cutoffs prometheus.Counter
cutoffsFailed prometheus.Counter
startTime prometheus.GaugeFunc
tombCleanTimer prometheus.Histogram
}
@ -172,6 +173,17 @@ func newDBMetrics(db *DB, r prometheus.Registerer) *dbMetrics {
Name: "prometheus_tsdb_retention_cutoffs_failures_total",
Help: "Number of times the database failed to cut off block data from disk.",
})
m.startTime = prometheus.NewGaugeFunc(prometheus.GaugeOpts{
Name: "prometheus_tsdb_lowest_timestamp",
Help: "Lowest timestamp value stored in the database.",
}, func() float64 {
db.mtx.RLock()
defer db.mtx.RUnlock()
if len(db.blocks) == 0 {
return float64(db.head.minTime)
}
return float64(db.blocks[0].meta.MinTime)
})
m.tombCleanTimer = prometheus.NewHistogram(prometheus.HistogramOpts{
Name: "prometheus_tsdb_tombstone_cleanup_seconds",
Help: "The time taken to recompact blocks to remove tombstones.",
@ -186,6 +198,7 @@ func newDBMetrics(db *DB, r prometheus.Registerer) *dbMetrics {
m.cutoffs,
m.cutoffsFailed,
m.compactionsTriggered,
m.startTime,
m.tombCleanTimer,
)
}