22cd28a798
* count and limit concurrent queries Signed-off-by: Chris O'Haver <cohaver@infoblox.com> * add option Signed-off-by: Chris O'Haver <cohaver@infoblox.com> * return servfail when limit exceeded Signed-off-by: Chris O'Haver <cohaver@infoblox.com> * docs Signed-off-by: Chris O'Haver <cohaver@infoblox.com> * docs Signed-off-by: Chris O'Haver <cohaver@infoblox.com> * docs Signed-off-by: Chris O'Haver <cohaver@infoblox.com> * review feedback Signed-off-by: Chris O'Haver <cohaver@infoblox.com> * move atomic counter to beginning of struct Signed-off-by: Chris O'Haver <cohaver@infoblox.com> * add comment for ErrLimitExceeded Signed-off-by: Chris O'Haver <cohaver@infoblox.com> * rename option to max_concurrent Signed-off-by: Chris O'Haver <cohaver@infoblox.com> * add metric Signed-off-by: Chris O'Haver <cohaver@infoblox.com> * response REFUSED; incl max in error; add more docs Signed-off-by: Chris O'Haver <cohaver@infoblox.com> * avoid err setup race Signed-off-by: Chris O'Haver <cohaver@infoblox.com> * respond SERVFAIL; doc memory usage Signed-off-by: Chris O'Haver <cohaver@infoblox.com>
54 lines
1.9 KiB
Go
54 lines
1.9 KiB
Go
package forward
|
|
|
|
import (
|
|
"github.com/coredns/coredns/plugin"
|
|
|
|
"github.com/prometheus/client_golang/prometheus"
|
|
)
|
|
|
|
// Variables declared for monitoring.
|
|
var (
|
|
RequestCount = prometheus.NewCounterVec(prometheus.CounterOpts{
|
|
Namespace: plugin.Namespace,
|
|
Subsystem: "forward",
|
|
Name: "request_count_total",
|
|
Help: "Counter of requests made per upstream.",
|
|
}, []string{"to"})
|
|
RcodeCount = prometheus.NewCounterVec(prometheus.CounterOpts{
|
|
Namespace: plugin.Namespace,
|
|
Subsystem: "forward",
|
|
Name: "response_rcode_count_total",
|
|
Help: "Counter of requests made per upstream.",
|
|
}, []string{"rcode", "to"})
|
|
RequestDuration = prometheus.NewHistogramVec(prometheus.HistogramOpts{
|
|
Namespace: plugin.Namespace,
|
|
Subsystem: "forward",
|
|
Name: "request_duration_seconds",
|
|
Buckets: plugin.TimeBuckets,
|
|
Help: "Histogram of the time each request took.",
|
|
}, []string{"to"})
|
|
HealthcheckFailureCount = prometheus.NewCounterVec(prometheus.CounterOpts{
|
|
Namespace: plugin.Namespace,
|
|
Subsystem: "forward",
|
|
Name: "healthcheck_failure_count_total",
|
|
Help: "Counter of the number of failed healthchecks.",
|
|
}, []string{"to"})
|
|
HealthcheckBrokenCount = prometheus.NewCounter(prometheus.CounterOpts{
|
|
Namespace: plugin.Namespace,
|
|
Subsystem: "forward",
|
|
Name: "healthcheck_broken_count_total",
|
|
Help: "Counter of the number of complete failures of the healthchecks.",
|
|
})
|
|
SocketGauge = prometheus.NewGaugeVec(prometheus.GaugeOpts{
|
|
Namespace: plugin.Namespace,
|
|
Subsystem: "forward",
|
|
Name: "sockets_open",
|
|
Help: "Gauge of open sockets per upstream.",
|
|
}, []string{"to"})
|
|
MaxConcurrentRejectCount = prometheus.NewCounter(prometheus.CounterOpts{
|
|
Namespace: plugin.Namespace,
|
|
Subsystem: "forward",
|
|
Name: "max_concurrent_reject_count_total",
|
|
Help: "Counter of the number of queries rejected because the concurrent queries were at maximum.",
|
|
})
|
|
)
|