Add reduced memory usage option.

CHANGELOG.md

@@ -1,6 +1,7 @@
 dev:
   - add proposal value and blinded status to trace
   - add beaconblockproposer.builder-boost-factor
+  - add reduced memory mode for memory-constrained systems
 
 1.9.0-alpha.2:
   - allow Vouch to act as an MEV-boost client for non-Vouch validators

clients.go

@@ -54,6 +54,7 @@ func fetchClient(ctx context.Context, monitor metrics.Service, address string) (
 			httpclient.WithExtraHeaders(map[string]string{
 				"User-Agent": fmt.Sprintf("Vouch/%s", ReleaseVersion),
 			}),
+			httpclient.WithReducedMemoryUsage(util.HierarchicalBool("reduced-memory-usage", fmt.Sprintf("eth2client.%s", address))),
 		)
 		if err != nil {
 			return nil, errors.Wrap(err, "failed to initiate consensus client")

docs/configuration.md

@@ -35,6 +35,9 @@ beacon-node-addresses: ['localhost:4000', 'localhost:5051', 'localhost:5052']
 # timeout is the timeout for all validating operations, for example fetching attesation data from beacon nodes.
 timeout: '2s'
 
+# reduced-memory-usage can be set on memory-constrained systems to reduce memory usage, at the cost of increased processing time.
+reduced-memory-usage: false
+
 eth2client:
   # timeout is the timeout for all operations against beacon nodes that are not related to a specific validating
   # operation, for example fetching the current list of active validators.  These operations are not time-sensitive,