fix: start trace exporter only if required

[alexghr]

This PR splits the collector URL into _METRICS_ENDPOINT and _TRACES_ENDPOINT and makes exporting traces optional (if no processor is registered then the default processor is a no-op)

See https://www.npmjs.com/package/@opentelemetry/exporter-trace-otlp-http#user-content-configuration-options-as-environment-variables

[AztecBot]

Benchmark results

Metrics with a significant change:

• protocol_circuit_simulation_time_in_ms (private-kernel-tail-to-public): 664 (-50%)
• avm_simulation_time_ms (Token:transfer_public): 19.5 (-40%)

Detailed results

All benchmarks are run on txs on the Benchmarking contract on the repository. Each tx consists of a batch call to create_note and increment_balance, which guarantees that each tx has a private call, a nested private call, a public call, and a nested public call, as well as an emitted private note, an unencrypted log, and public storage read and write.

This benchmark source data is available in JSON format on S3 here.

Proof generation

Each column represents the number of threads used in proof generation.

Metric	1 threads	4 threads	16 threads	32 threads	64 threads
proof_construction_time_sha256_ms	5,752	1,565	716 (+1%)	770 (-1%)	777
proof_construction_time_sha256_30_ms	11,507	3,083	1,378 (-1%)	1,415 (-1%)	1,457
proof_construction_time_sha256_100_ms	44,428 (+1%)	11,907 (+1%)	5,555 (+2%)	5,539 (+1%)	5,757
proof_construction_time_poseidon_hash_ms	78.0	34.0	34.0	59.0 (+2%)	88.0 (-1%)
proof_construction_time_poseidon_hash_30_ms	1,528	424	202	226 (+3%)	274 (+3%)
proof_construction_time_poseidon_hash_100_ms	5,640	1,509	677 (+1%)	730 (-1%)	750

L2 block published to L1

Each column represents the number of txs on an L2 block published to L1.

Metric	4 txs	8 txs	16 txs
l1_rollup_calldata_size_in_bytes	4,356	7,876	14,884
l1_rollup_calldata_gas	50,160	93,014	178,156
l1_rollup_execution_gas	1,396,411	2,130,161	3,915,359
l2_block_processing_time_in_ms	252 (+3%)	450 (+1%)	823 (+3%)
l2_block_building_time_in_ms	8,976	17,465	34,852
l2_block_rollup_simulation_time_in_ms	8,976	17,464	34,851
l2_block_public_tx_process_time_in_ms	7,580 (+1%)	15,961	33,307

L2 chain processing

Each column represents the number of blocks on the L2 chain where each block has 8 txs.

Metric	3 blocks	5 blocks
node_history_sync_time_in_ms	2,951 (+4%)	3,859
node_database_size_in_bytes	12,603,472	16,715,856
pxe_database_size_in_bytes	16,254	26,813

Circuits stats

Stats on running time and I/O sizes collected for every kernel circuit run across all benchmarks.

Circuit	simulation_time_in_ms	witness_generation_time_in_ms	input_size_in_bytes	output_size_in_bytes	proving_time_in_ms
private-kernel-init	91.0 (+3%)	406 (+2%)	21,755	44,860	N/A
private-kernel-inner	170 (+2%)	717 (+2%)	72,566	45,007	N/A
private-kernel-reset-tiny	459	879 (-2%)	65,675	44,846	N/A
private-kernel-tail	195 (-1%)	159 (+1%)	50,686	52,257	N/A
base-parity	5.58 (-1%)	N/A	160	96.0	N/A
root-parity	35.6 (+1%)	N/A	73,948	96.0	N/A
base-rollup	2,746	N/A	189,136	664	N/A
block-root-rollup	41.5	N/A	58,205	2,448	N/A
public-kernel-setup	83.8	N/A	105,085	71,222	N/A
public-kernel-app-logic	95.0	N/A	104,911	71,222	N/A
public-kernel-tail	555	N/A	410,534	16,414	N/A
private-kernel-reset-small	465 (+3%)	N/A	66,341	45,629	N/A
private-kernel-tail-to-public	⚠️ 664 (-50%)	659 (-6%)	460,796	1,825	N/A
public-kernel-teardown	82.9 (+1%)	N/A	105,349	71,222	N/A
merge-rollup	19.9 (-2%)	N/A	38,174	664	N/A
undefined	N/A	N/A	N/A	N/A	77,846 (-1%)

Stats on running time collected for app circuits

Function	input_size_in_bytes	output_size_in_bytes	witness_generation_time_in_ms
ContractClassRegisterer:register	1,344	11,731	342
ContractInstanceDeployer:deploy	1,408	11,731	18.3 (-1%)
MultiCallEntrypoint:entrypoint	1,920	11,731	405
FeeJuice:deploy	1,376	11,731	390
SchnorrAccount:constructor	1,312	11,731	74.6 (-1%)
SchnorrAccount:entrypoint	2,304	11,731	398 (+1%)
Token:privately_mint_private_note	1,280	11,731	104 (-1%)
FPC:fee_entrypoint_public	1,344	11,731	26.6 (-4%)
Token:transfer	1,312	11,731	233 (+3%)
Benchmarking:create_note	1,344	11,731	87.3 (+1%)
SchnorrAccount:verify_private_authwit	1,280	11,731	27.6 (+1%)
Token:unshield	1,376	11,731	524
FPC:fee_entrypoint_private	1,376	11,731	703

AVM Simulation

Time to simulate various public functions in the AVM.

Function	time_ms	bytecode_size_in_bytes
FeeJuice:_increase_public_balance	53.7 (-4%)	7,739
FeeJuice:set_portal	9.57 (-21%)	2,354
Token:constructor	77.9 (-3%)	26,051
FPC:constructor	53.1 (-3%)	18,001
FeeJuice:mint_public	39.8	5,877
Token:mint_public	70.7 (-3%)	10,917
Token:assert_minter_and_mint	41.4 (+1%)	7,512
AuthRegistry:set_authorized	39.8 (-16%)	4,391
FPC:prepare_fee	241 (+2%)	7,043
Token:transfer_public	⚠️ 19.5 (-40%)	39,426
FPC:pay_refund	56.3 (+1%)	10,234
Benchmarking:increment_balance	933	6,563
Token:_increase_public_balance	40.3 (-1%)	8,433
FPC:pay_refund_with_shielded_rebate	61.8 (-4%)	10,783

Public DB Access

Time to access various public DBs.

Function	time_ms
get-nullifier-index	0.159

Tree insertion stats

The duration to insert a fixed batch of leaves into each tree type.

Metric	1 leaves	16 leaves	64 leaves	128 leaves	256 leaves	512 leaves	1024 leaves
batch_insert_into_append_only_tree_16_depth_ms	2.21 (+1%)	3.98 (+3%)	N/A	N/A	N/A	N/A	N/A
batch_insert_into_append_only_tree_16_depth_hash_count	16.8	31.7	N/A	N/A	N/A	N/A	N/A
batch_insert_into_append_only_tree_16_depth_hash_ms	0.115 (+1%)	0.112 (+3%)	N/A	N/A	N/A	N/A	N/A
batch_insert_into_append_only_tree_32_depth_ms	N/A	N/A	11.6 (+1%)	17.6	31.5 (+4%)	58.8	113
batch_insert_into_append_only_tree_32_depth_hash_count	N/A	N/A	95.9	159	287	543	1,055
batch_insert_into_append_only_tree_32_depth_hash_ms	N/A	N/A	0.111 (+1%)	0.102	0.103 (+4%)	0.101	0.102 (+1%)
batch_insert_into_indexed_tree_20_depth_ms	N/A	N/A	14.4 (-1%)	25.7 (-1%)	44.0 (+1%)	83.1	161 (+1%)
batch_insert_into_indexed_tree_20_depth_hash_count	N/A	N/A	109	207	355	691	1,363
batch_insert_into_indexed_tree_20_depth_hash_ms	N/A	N/A	0.109 (-1%)	0.103 (-1%)	0.103 (-2%)	0.102	0.103 (+2%)
batch_insert_into_indexed_tree_40_depth_ms	N/A	N/A	16.6 (+1%)	N/A	N/A	N/A	N/A
batch_insert_into_indexed_tree_40_depth_hash_count	N/A	N/A	132	N/A	N/A	N/A	N/A
batch_insert_into_indexed_tree_40_depth_hash_ms	N/A	N/A	0.106	N/A	N/A	N/A	N/A

Miscellaneous

Transaction sizes based on how many contract classes are registered in the tx.

Metric	0 registered classes	1 registered classes
tx_size_in_bytes	64,779	668,997

Transaction size based on fee payment method

| Metric | |
| - | |

[alexghr]

I have to updated the aztec start cli flags The flags for aztec start are generated from config automatically :)