retry: Set attempt's initial value to 1

This change simplifies the use of `attempt` as a number for reading in
log messages and `if`s. Also before, with `attempt` starting with `0`,
the second attempt would have been taken immediately, as our backoff
implementation returns `0` in this case.

Co-Authored-By: Alvar Penning <alvar.penning@icinga.com>

pkg/config/redis.go

@@ -92,9 +92,9 @@ func dialWithLogging(dialer ctxDialerFunc, logger *logging.Logger) ctxDialerFunc
 					}
 				},
 				OnSuccess: func(elapsed time.Duration, attempt uint64, _ error) {
-					if attempt > 0 {
+					if attempt > 1 {
 						logger.Infow("Reconnected to Redis",
-							zap.Duration("after", elapsed), zap.Uint64("attempts", attempt+1))
+							zap.Duration("after", elapsed), zap.Uint64("attempts", attempt))
 					}
 				},
 			},

pkg/icingadb/db.go

@@ -680,10 +680,10 @@ func (db *DB) getDefaultRetrySettings() retry.Settings {
 			}
 		},
 		OnSuccess: func(elapsed time.Duration, attempt uint64, lastErr error) {
-			if attempt > 0 {
+			if attempt > 1 {
 				db.logger.Infow("Query retried successfully after error",
 					zap.Duration("after", elapsed),
-					zap.Uint64("attempts", attempt+1),
+					zap.Uint64("attempts", attempt),
 					zap.NamedError("recovered_error", lastErr))
 			}
 		},

pkg/icingadb/driver.go

@@ -66,9 +66,9 @@ func (c RetryConnector) Connect(ctx context.Context) (driver.Conn, error) {
 			OnSuccess: func(elapsed time.Duration, attempt uint64, _ error) {
 				telemetry.UpdateCurrentDbConnErr(nil)
 
-				if attempt > 0 {
+				if attempt > 1 {
 					c.logger.Infow("Reconnected to database",
-						zap.Duration("after", elapsed), zap.Uint64("attempts", attempt+1))
+						zap.Duration("after", elapsed), zap.Uint64("attempts", attempt))
 				}
 			},
 		},

pkg/icingadb/ha.go

@@ -390,7 +390,7 @@ func (h *HA) realize(
 			OnRetryableError: func(_ time.Duration, attempt uint64, err, lastErr error) {
 				if lastErr == nil || err.Error() != lastErr.Error() {
 					log := h.logger.Debugw
-					if attempt > 2 {
+					if attempt > 3 {
 						log = h.logger.Infow
 					}
 
@@ -398,10 +398,10 @@ func (h *HA) realize(
 				}
 			},
 			OnSuccess: func(elapsed time.Duration, attempt uint64, lastErr error) {
-				if attempt > 0 {
+				if attempt > 1 {
 					log := h.logger.Debugw
 
-					if attempt > 3 {
+					if attempt > 4 {
 						// We log errors with severity info starting from the fourth attempt, (see above)
 						// so we need to log success with severity info from the fifth attempt.
 						log = h.logger.Infow
@@ -409,7 +409,7 @@ func (h *HA) realize(
 
 					log("Instance updated/inserted successfully after error",
 						zap.Duration("after", elapsed),
-						zap.Uint64("attempts", attempt+1),
+						zap.Uint64("attempts", attempt),
 						zap.NamedError("recovered_error", lastErr))
 				}
 			},

pkg/retry/retry.go

@@ -50,7 +50,7 @@ func WithBackoff(
 	}
 
 	start := time.Now()
-	for attempt := uint64(0); ; /* true */ attempt++ {
+	for attempt := uint64(1); ; /* true */ attempt++ {
 		prevErr := err
 
 		if err = retryableFunc(ctx); err == nil {