fix(#234): use unique consumer groups

internal/repository/kafka/kafka.go

@@ -3,6 +3,7 @@ package kafka
 import (
 	"context"
 	"errors"
+	"fmt"
 	"github.com/IBM/sarama"
 	"github.com/Interhyp/metadata-service/internal/acorn/config"
 	"github.com/Interhyp/metadata-service/internal/acorn/repository"
@@ -131,9 +132,7 @@ func (r *Impl) StartReceiveLoop(ctx context.Context) error {
 			return errors.New("failed to obtain local non-localhost ip address to use for consumer group, did not get an ipv4 address")
 		}
 
-		workerNodeId := ipComponents[2]
-
-		groupId = "metadata-worker" + workerNodeId
+		groupId = fmt.Sprintf("metadata-worker-%s-%s", ipComponents[2], ipComponents[3])
 	}
 	topicConfig.ConsumerGroup = &groupId
 	r.Logging.Logger().Ctx(ctx).Info().Printf("using kafka group id %s for consumer", groupId)
@@ -142,6 +141,7 @@ func (r *Impl) StartReceiveLoop(ctx context.Context) error {
 	configPreset.Net.TLS.Enable = true
 	configPreset.Producer.Compression = sarama.CompressionNone
 	configPreset.MetricRegistry = metrics.NewPrefixedChildRegistry(metrics.DefaultRegistry, "sarama.consumer.")
+	configPreset.Consumer.Offsets.Initial = sarama.OffsetNewest
 
 	consumer, err := aukafka.CreateConsumer[repository.UpdateEvent](ctx, *topicConfig, callback, configPreset)
 	if err != nil {