The new flag `datasource.disableKeepAlive` allows disabling keepalive
connections. This may be useful if there are multiple datasource
replicas (e.g. vmselects) behind the HTTP balancer to avoid uneven
load spread because of long-lived connections.
Signed-off-by: hagen1778 <roman@victoriametrics.com>
Executor recently gain field for storing previously sent series.
Since the same executor object can be used in multiple goroutines,
the access to this field should be serialized.
Signed-off-by: hagen1778 <roman@victoriametrics.com>
* vmalert: split alert's `Start` field into `ActiveAt` and `Start`
The `ActiveAt` field identifies when alert becomes active for rules
with `for > 0`. Previously, this value was stored in field `Start`.
The field `Start` now identifies the moment alert became `FIRING`.
The split is needed in order to distinguish these two moments
in the API responses for alerts.
Signed-off-by: hagen1778 <roman@victoriametrics.com>
* vmalert: support specific moment of time for rules evaluation
The Querier interface was extended to accept a new argument
used as a timestamp at which evaluation should be made.
It is needed to align rules execution time within the group.
Signed-off-by: hagen1778 <roman@victoriametrics.com>
* vmalert: mark disappeared series as stale
Series generated by alerting rules, which were sent to remote write
now will be marked as stale if they will disappear on the next
evaluation. This would make ALERTS and ALERTS_FOR_TIME series
more precise.
Signed-off-by: hagen1778 <roman@victoriametrics.com>
* wip
Signed-off-by: hagen1778 <roman@victoriametrics.com>
* vmalert: evaluate rules at fixed timestamp
Before, time at which rules were evaluated was calculated
right before rule execution. The change makes sure
that timestamp is calculated only once per evalution round
and all rules are using the same timestamp.
It also updates the logic of resending of already resolved
alert notification.
Signed-off-by: hagen1778 <roman@victoriametrics.com>
* vmalert: allow overridin `alertname` label value if it is present in response
Previously, `alertname` was always equal to the Alerting Rule name. Now,
its value can be overriden if series in response containt the different value
for this label.
The change is needed for improving compatibility with Prometheus.
Signed-off-by: hagen1778 <roman@victoriametrics.com>
* vmalert: align rules evaluation in time
Now, evaluation timestamp for rules evaluates as if
there was no delay in rules evaluation. It means, that
rules will be evaluated at fixed timestamps+group_interval.
This way provides more consistent evaluation results and
improves compatibility with Prometheus,
Signed-off-by: hagen1778 <roman@victoriametrics.com>
* vmalert: add metric for missed iterations
New metric `vmalert_iteration_missed_total` will show
whether rules evaluation round was missed.
Signed-off-by: hagen1778 <roman@victoriametrics.com>
* vmalert: reduce delay before the initial rule evaluation in group
Signed-off-by: hagen1778 <roman@victoriametrics.com>
* vmalert: rollback alertname override
According to the spec:
```
The alert name from the alerting rule (HighRequestLatency from the example above) MUST be added to the labels of the alert with the label name as alertname. It MUST override any existing alertname label.
```
https://github.com/prometheus/compliance/blob/main/alert_generator/specification.md#step-3
Signed-off-by: hagen1778 <roman@victoriametrics.com>
* vmalert: throw err immediately on dedup detection
```
The execution of an alerting rule MUST error out immediately and MUST NOT send any alerts
or add samples to samples receiver if there is more than one alert with the same labels
```
https://github.com/prometheus/compliance/blob/main/alert_generator/specification.md#step-4
Signed-off-by: hagen1778 <roman@victoriametrics.com>
* vmalert: cleanup
Signed-off-by: hagen1778 <roman@victoriametrics.com>
* vmalert: use strings builder to reduce allocs
Signed-off-by: hagen1778 <roman@victoriametrics.com>
* lib/{storage,regexpcache}: replaces regexpCacheMap with LRU cache
It should decrease memory usage for regexp caching
with storing cacheEntry by pointer - golang map should be able to effectivly shrink it's size
original issue with this case - unexpected map grows and storage OOM
Apply suggestions from code review
Co-authored-by: Roman Khavronenko <roman@victoriametrics.com>
Adds missing metrics for regexp cache and regexpPrefixes cache
* wip
* wip
Co-authored-by: Aliaksandr Valialkin <valyala@victoriametrics.com>
* Update url-examples.md
+additional examples
* Update
* Update url-examples
Some changes requested by Roman.
* Update url-examples.md
* Update url-example
* Update url-examples
Additional info and marking for /labels part
* Update url-example
Added example with complex query which needs encoding:
How to execute the query similar to - sum(increase(foo{status="bar"}[5m])) by (status)
* Update url-samples
Co-authored-by: Aliaksandr Valialkin <valyala@victoriametrics.com>
