docs(slo): add attempts metric to README.md

Author: ImpressionableRaccoon

tests/slo/README.md

@@ -123,6 +123,7 @@ Primary key: `("hash", "id")`
 - `not_oks`  - amount of not OK requests
 - `inflight` - amount of requests in flight
 - `latency`  - summary of latencies in ms
+- `attempts` - summary of amount for request
 
 > You must reset metrics to keep them `0` in prometheus and grafana before beginning and after ending of jobs
 
@@ -140,6 +141,8 @@ func (m *Metrics) Reset() error {
 
     m.latencies.Reset()
 
+    m.attempts.Reset()
+
     return m.Push()
 }
 ```

tests/slo/internal/metrics/metrics.go

@@ -76,7 +76,7 @@ func New(logger *zap.Logger, url, label string) (*Metrics, error) {
 	m.attempts = prometheus.NewHistogramVec(
 		prometheus.HistogramOpts{
 			Name:    "attempts",
-			Help:    "amount of retries for request",
+			Help:    "summary of amount for request",
 			Buckets: prometheus.LinearBuckets(1, 1, 10),
 		},
 		[]string{"status", "jobName"},