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[chore][exporter/loadbalancing] Migrate to OTel from OC metrics (#33550)
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This PR migrates from OpenCensus to OTel for metrics, via mdatagen.

Before:
```
# HELP otelcol_loadbalancer_backend_latency Response latency in ms for the backends
# TYPE otelcol_loadbalancer_backend_latency histogram
otelcol_loadbalancer_backend_latency_bucket{endpoint="127.0.0.1:5317",service_instance_id="6960afd1-4bb6-4c52-bdc7-d8b236ad8eba",service_name="otelcontribcol",service_version="0.102.0-dev",le="5"} 1
otelcol_loadbalancer_backend_latency_bucket{endpoint="127.0.0.1:5317",service_instance_id="6960afd1-4bb6-4c52-bdc7-d8b236ad8eba",service_name="otelcontribcol",service_version="0.102.0-dev",le="10"} 1
otelcol_loadbalancer_backend_latency_bucket{endpoint="127.0.0.1:5317",service_instance_id="6960afd1-4bb6-4c52-bdc7-d8b236ad8eba",service_name="otelcontribcol",service_version="0.102.0-dev",le="20"} 1
otelcol_loadbalancer_backend_latency_bucket{endpoint="127.0.0.1:5317",service_instance_id="6960afd1-4bb6-4c52-bdc7-d8b236ad8eba",service_name="otelcontribcol",service_version="0.102.0-dev",le="50"} 1
otelcol_loadbalancer_backend_latency_bucket{endpoint="127.0.0.1:5317",service_instance_id="6960afd1-4bb6-4c52-bdc7-d8b236ad8eba",service_name="otelcontribcol",service_version="0.102.0-dev",le="100"} 1
otelcol_loadbalancer_backend_latency_bucket{endpoint="127.0.0.1:5317",service_instance_id="6960afd1-4bb6-4c52-bdc7-d8b236ad8eba",service_name="otelcontribcol",service_version="0.102.0-dev",le="200"} 1
otelcol_loadbalancer_backend_latency_bucket{endpoint="127.0.0.1:5317",service_instance_id="6960afd1-4bb6-4c52-bdc7-d8b236ad8eba",service_name="otelcontribcol",service_version="0.102.0-dev",le="500"} 1
otelcol_loadbalancer_backend_latency_bucket{endpoint="127.0.0.1:5317",service_instance_id="6960afd1-4bb6-4c52-bdc7-d8b236ad8eba",service_name="otelcontribcol",service_version="0.102.0-dev",le="1000"} 1
otelcol_loadbalancer_backend_latency_bucket{endpoint="127.0.0.1:5317",service_instance_id="6960afd1-4bb6-4c52-bdc7-d8b236ad8eba",service_name="otelcontribcol",service_version="0.102.0-dev",le="2000"} 1
otelcol_loadbalancer_backend_latency_bucket{endpoint="127.0.0.1:5317",service_instance_id="6960afd1-4bb6-4c52-bdc7-d8b236ad8eba",service_name="otelcontribcol",service_version="0.102.0-dev",le="5000"} 1
otelcol_loadbalancer_backend_latency_bucket{endpoint="127.0.0.1:5317",service_instance_id="6960afd1-4bb6-4c52-bdc7-d8b236ad8eba",service_name="otelcontribcol",service_version="0.102.0-dev",le="+Inf"} 1
otelcol_loadbalancer_backend_latency_sum{endpoint="127.0.0.1:5317",service_instance_id="6960afd1-4bb6-4c52-bdc7-d8b236ad8eba",service_name="otelcontribcol",service_version="0.102.0-dev"} 0
otelcol_loadbalancer_backend_latency_count{endpoint="127.0.0.1:5317",service_instance_id="6960afd1-4bb6-4c52-bdc7-d8b236ad8eba",service_name="otelcontribcol",service_version="0.102.0-dev"} 1
otelcol_loadbalancer_backend_latency_bucket{endpoint="127.0.0.1:6317",service_instance_id="6960afd1-4bb6-4c52-bdc7-d8b236ad8eba",service_name="otelcontribcol",service_version="0.102.0-dev",le="5"} 1
otelcol_loadbalancer_backend_latency_bucket{endpoint="127.0.0.1:6317",service_instance_id="6960afd1-4bb6-4c52-bdc7-d8b236ad8eba",service_name="otelcontribcol",service_version="0.102.0-dev",le="10"} 1
otelcol_loadbalancer_backend_latency_bucket{endpoint="127.0.0.1:6317",service_instance_id="6960afd1-4bb6-4c52-bdc7-d8b236ad8eba",service_name="otelcontribcol",service_version="0.102.0-dev",le="20"} 1
otelcol_loadbalancer_backend_latency_bucket{endpoint="127.0.0.1:6317",service_instance_id="6960afd1-4bb6-4c52-bdc7-d8b236ad8eba",service_name="otelcontribcol",service_version="0.102.0-dev",le="50"} 1
otelcol_loadbalancer_backend_latency_bucket{endpoint="127.0.0.1:6317",service_instance_id="6960afd1-4bb6-4c52-bdc7-d8b236ad8eba",service_name="otelcontribcol",service_version="0.102.0-dev",le="100"} 1
otelcol_loadbalancer_backend_latency_bucket{endpoint="127.0.0.1:6317",service_instance_id="6960afd1-4bb6-4c52-bdc7-d8b236ad8eba",service_name="otelcontribcol",service_version="0.102.0-dev",le="200"} 1
otelcol_loadbalancer_backend_latency_bucket{endpoint="127.0.0.1:6317",service_instance_id="6960afd1-4bb6-4c52-bdc7-d8b236ad8eba",service_name="otelcontribcol",service_version="0.102.0-dev",le="500"} 1
otelcol_loadbalancer_backend_latency_bucket{endpoint="127.0.0.1:6317",service_instance_id="6960afd1-4bb6-4c52-bdc7-d8b236ad8eba",service_name="otelcontribcol",service_version="0.102.0-dev",le="1000"} 1
otelcol_loadbalancer_backend_latency_bucket{endpoint="127.0.0.1:6317",service_instance_id="6960afd1-4bb6-4c52-bdc7-d8b236ad8eba",service_name="otelcontribcol",service_version="0.102.0-dev",le="2000"} 1
otelcol_loadbalancer_backend_latency_bucket{endpoint="127.0.0.1:6317",service_instance_id="6960afd1-4bb6-4c52-bdc7-d8b236ad8eba",service_name="otelcontribcol",service_version="0.102.0-dev",le="5000"} 1
otelcol_loadbalancer_backend_latency_bucket{endpoint="127.0.0.1:6317",service_instance_id="6960afd1-4bb6-4c52-bdc7-d8b236ad8eba",service_name="otelcontribcol",service_version="0.102.0-dev",le="+Inf"} 1
otelcol_loadbalancer_backend_latency_sum{endpoint="127.0.0.1:6317",service_instance_id="6960afd1-4bb6-4c52-bdc7-d8b236ad8eba",service_name="otelcontribcol",service_version="0.102.0-dev"} 0
otelcol_loadbalancer_backend_latency_count{endpoint="127.0.0.1:6317",service_instance_id="6960afd1-4bb6-4c52-bdc7-d8b236ad8eba",service_name="otelcontribcol",service_version="0.102.0-dev"} 1
otelcol_loadbalancer_backend_latency_bucket{endpoint="127.0.0.1:7317",service_instance_id="6960afd1-4bb6-4c52-bdc7-d8b236ad8eba",service_name="otelcontribcol",service_version="0.102.0-dev",le="5"} 1
otelcol_loadbalancer_backend_latency_bucket{endpoint="127.0.0.1:7317",service_instance_id="6960afd1-4bb6-4c52-bdc7-d8b236ad8eba",service_name="otelcontribcol",service_version="0.102.0-dev",le="10"} 1
otelcol_loadbalancer_backend_latency_bucket{endpoint="127.0.0.1:7317",service_instance_id="6960afd1-4bb6-4c52-bdc7-d8b236ad8eba",service_name="otelcontribcol",service_version="0.102.0-dev",le="20"} 1
otelcol_loadbalancer_backend_latency_bucket{endpoint="127.0.0.1:7317",service_instance_id="6960afd1-4bb6-4c52-bdc7-d8b236ad8eba",service_name="otelcontribcol",service_version="0.102.0-dev",le="50"} 1
otelcol_loadbalancer_backend_latency_bucket{endpoint="127.0.0.1:7317",service_instance_id="6960afd1-4bb6-4c52-bdc7-d8b236ad8eba",service_name="otelcontribcol",service_version="0.102.0-dev",le="100"} 1
otelcol_loadbalancer_backend_latency_bucket{endpoint="127.0.0.1:7317",service_instance_id="6960afd1-4bb6-4c52-bdc7-d8b236ad8eba",service_name="otelcontribcol",service_version="0.102.0-dev",le="200"} 1
otelcol_loadbalancer_backend_latency_bucket{endpoint="127.0.0.1:7317",service_instance_id="6960afd1-4bb6-4c52-bdc7-d8b236ad8eba",service_name="otelcontribcol",service_version="0.102.0-dev",le="500"} 1
otelcol_loadbalancer_backend_latency_bucket{endpoint="127.0.0.1:7317",service_instance_id="6960afd1-4bb6-4c52-bdc7-d8b236ad8eba",service_name="otelcontribcol",service_version="0.102.0-dev",le="1000"} 1
otelcol_loadbalancer_backend_latency_bucket{endpoint="127.0.0.1:7317",service_instance_id="6960afd1-4bb6-4c52-bdc7-d8b236ad8eba",service_name="otelcontribcol",service_version="0.102.0-dev",le="2000"} 1
otelcol_loadbalancer_backend_latency_bucket{endpoint="127.0.0.1:7317",service_instance_id="6960afd1-4bb6-4c52-bdc7-d8b236ad8eba",service_name="otelcontribcol",service_version="0.102.0-dev",le="5000"} 1
otelcol_loadbalancer_backend_latency_bucket{endpoint="127.0.0.1:7317",service_instance_id="6960afd1-4bb6-4c52-bdc7-d8b236ad8eba",service_name="otelcontribcol",service_version="0.102.0-dev",le="+Inf"} 1
otelcol_loadbalancer_backend_latency_sum{endpoint="127.0.0.1:7317",service_instance_id="6960afd1-4bb6-4c52-bdc7-d8b236ad8eba",service_name="otelcontribcol",service_version="0.102.0-dev"} 0
otelcol_loadbalancer_backend_latency_count{endpoint="127.0.0.1:7317",service_instance_id="6960afd1-4bb6-4c52-bdc7-d8b236ad8eba",service_name="otelcontribcol",service_version="0.102.0-dev"} 1
# HELP otelcol_loadbalancer_backend_outcome Number of success/failures for each endpoint
# TYPE otelcol_loadbalancer_backend_outcome counter
otelcol_loadbalancer_backend_outcome{endpoint="127.0.0.1:5317",service_instance_id="6960afd1-4bb6-4c52-bdc7-d8b236ad8eba",service_name="otelcontribcol",service_version="0.102.0-dev",success="true"} 1
otelcol_loadbalancer_backend_outcome{endpoint="127.0.0.1:6317",service_instance_id="6960afd1-4bb6-4c52-bdc7-d8b236ad8eba",service_name="otelcontribcol",service_version="0.102.0-dev",success="true"} 1
otelcol_loadbalancer_backend_outcome{endpoint="127.0.0.1:7317",service_instance_id="6960afd1-4bb6-4c52-bdc7-d8b236ad8eba",service_name="otelcontribcol",service_version="0.102.0-dev",success="true"} 1
# HELP otelcol_loadbalancer_num_backend_updates Number of times the list of backends was updated
# TYPE otelcol_loadbalancer_num_backend_updates counter
otelcol_loadbalancer_num_backend_updates{resolver="static",service_instance_id="6960afd1-4bb6-4c52-bdc7-d8b236ad8eba",service_name="otelcontribcol",service_version="0.102.0-dev"} 2
# HELP otelcol_loadbalancer_num_backends Current number of backends in use
# TYPE otelcol_loadbalancer_num_backends gauge
otelcol_loadbalancer_num_backends{resolver="static",service_instance_id="6960afd1-4bb6-4c52-bdc7-d8b236ad8eba",service_name="otelcontribcol",service_version="0.102.0-dev"} 3
# HELP otelcol_loadbalancer_num_resolutions Number of times the resolver triggered a new resolutions
# TYPE otelcol_loadbalancer_num_resolutions counter
otelcol_loadbalancer_num_resolutions{resolver="static",service_instance_id="6960afd1-4bb6-4c52-bdc7-d8b236ad8eba",service_name="otelcontribcol",service_version="0.102.0-dev",success="true"} 2
```

After:
```
# HELP otelcol_loadbalancer_backend_latency Response latency in ms for the backends.
# TYPE otelcol_loadbalancer_backend_latency histogram
otelcol_loadbalancer_backend_latency_bucket{endpoint="127.0.0.1:5317",service_instance_id="660642c9-c94c-48ae-abf3-3808f8562941",service_name="otelcontribcol",service_version="0.102.0-dev",le="5"} 1
otelcol_loadbalancer_backend_latency_bucket{endpoint="127.0.0.1:5317",service_instance_id="660642c9-c94c-48ae-abf3-3808f8562941",service_name="otelcontribcol",service_version="0.102.0-dev",le="10"} 1
otelcol_loadbalancer_backend_latency_bucket{endpoint="127.0.0.1:5317",service_instance_id="660642c9-c94c-48ae-abf3-3808f8562941",service_name="otelcontribcol",service_version="0.102.0-dev",le="20"} 1
otelcol_loadbalancer_backend_latency_bucket{endpoint="127.0.0.1:5317",service_instance_id="660642c9-c94c-48ae-abf3-3808f8562941",service_name="otelcontribcol",service_version="0.102.0-dev",le="50"} 1
otelcol_loadbalancer_backend_latency_bucket{endpoint="127.0.0.1:5317",service_instance_id="660642c9-c94c-48ae-abf3-3808f8562941",service_name="otelcontribcol",service_version="0.102.0-dev",le="100"} 1
otelcol_loadbalancer_backend_latency_bucket{endpoint="127.0.0.1:5317",service_instance_id="660642c9-c94c-48ae-abf3-3808f8562941",service_name="otelcontribcol",service_version="0.102.0-dev",le="200"} 1
otelcol_loadbalancer_backend_latency_bucket{endpoint="127.0.0.1:5317",service_instance_id="660642c9-c94c-48ae-abf3-3808f8562941",service_name="otelcontribcol",service_version="0.102.0-dev",le="500"} 1
otelcol_loadbalancer_backend_latency_bucket{endpoint="127.0.0.1:5317",service_instance_id="660642c9-c94c-48ae-abf3-3808f8562941",service_name="otelcontribcol",service_version="0.102.0-dev",le="1000"} 1
otelcol_loadbalancer_backend_latency_bucket{endpoint="127.0.0.1:5317",service_instance_id="660642c9-c94c-48ae-abf3-3808f8562941",service_name="otelcontribcol",service_version="0.102.0-dev",le="2000"} 1
otelcol_loadbalancer_backend_latency_bucket{endpoint="127.0.0.1:5317",service_instance_id="660642c9-c94c-48ae-abf3-3808f8562941",service_name="otelcontribcol",service_version="0.102.0-dev",le="5000"} 1
otelcol_loadbalancer_backend_latency_bucket{endpoint="127.0.0.1:5317",service_instance_id="660642c9-c94c-48ae-abf3-3808f8562941",service_name="otelcontribcol",service_version="0.102.0-dev",le="+Inf"} 1
otelcol_loadbalancer_backend_latency_sum{endpoint="127.0.0.1:5317",service_instance_id="660642c9-c94c-48ae-abf3-3808f8562941",service_name="otelcontribcol",service_version="0.102.0-dev"} 0
otelcol_loadbalancer_backend_latency_count{endpoint="127.0.0.1:5317",service_instance_id="660642c9-c94c-48ae-abf3-3808f8562941",service_name="otelcontribcol",service_version="0.102.0-dev"} 1
otelcol_loadbalancer_backend_latency_bucket{endpoint="127.0.0.1:6317",service_instance_id="660642c9-c94c-48ae-abf3-3808f8562941",service_name="otelcontribcol",service_version="0.102.0-dev",le="5"} 1
otelcol_loadbalancer_backend_latency_bucket{endpoint="127.0.0.1:6317",service_instance_id="660642c9-c94c-48ae-abf3-3808f8562941",service_name="otelcontribcol",service_version="0.102.0-dev",le="10"} 1
otelcol_loadbalancer_backend_latency_bucket{endpoint="127.0.0.1:6317",service_instance_id="660642c9-c94c-48ae-abf3-3808f8562941",service_name="otelcontribcol",service_version="0.102.0-dev",le="20"} 1
otelcol_loadbalancer_backend_latency_bucket{endpoint="127.0.0.1:6317",service_instance_id="660642c9-c94c-48ae-abf3-3808f8562941",service_name="otelcontribcol",service_version="0.102.0-dev",le="50"} 1
otelcol_loadbalancer_backend_latency_bucket{endpoint="127.0.0.1:6317",service_instance_id="660642c9-c94c-48ae-abf3-3808f8562941",service_name="otelcontribcol",service_version="0.102.0-dev",le="100"} 1
otelcol_loadbalancer_backend_latency_bucket{endpoint="127.0.0.1:6317",service_instance_id="660642c9-c94c-48ae-abf3-3808f8562941",service_name="otelcontribcol",service_version="0.102.0-dev",le="200"} 1
otelcol_loadbalancer_backend_latency_bucket{endpoint="127.0.0.1:6317",service_instance_id="660642c9-c94c-48ae-abf3-3808f8562941",service_name="otelcontribcol",service_version="0.102.0-dev",le="500"} 1
otelcol_loadbalancer_backend_latency_bucket{endpoint="127.0.0.1:6317",service_instance_id="660642c9-c94c-48ae-abf3-3808f8562941",service_name="otelcontribcol",service_version="0.102.0-dev",le="1000"} 1
otelcol_loadbalancer_backend_latency_bucket{endpoint="127.0.0.1:6317",service_instance_id="660642c9-c94c-48ae-abf3-3808f8562941",service_name="otelcontribcol",service_version="0.102.0-dev",le="2000"} 1
otelcol_loadbalancer_backend_latency_bucket{endpoint="127.0.0.1:6317",service_instance_id="660642c9-c94c-48ae-abf3-3808f8562941",service_name="otelcontribcol",service_version="0.102.0-dev",le="5000"} 1
otelcol_loadbalancer_backend_latency_bucket{endpoint="127.0.0.1:6317",service_instance_id="660642c9-c94c-48ae-abf3-3808f8562941",service_name="otelcontribcol",service_version="0.102.0-dev",le="+Inf"} 1
otelcol_loadbalancer_backend_latency_sum{endpoint="127.0.0.1:6317",service_instance_id="660642c9-c94c-48ae-abf3-3808f8562941",service_name="otelcontribcol",service_version="0.102.0-dev"} 0
otelcol_loadbalancer_backend_latency_count{endpoint="127.0.0.1:6317",service_instance_id="660642c9-c94c-48ae-abf3-3808f8562941",service_name="otelcontribcol",service_version="0.102.0-dev"} 1
otelcol_loadbalancer_backend_latency_bucket{endpoint="127.0.0.1:7317",service_instance_id="660642c9-c94c-48ae-abf3-3808f8562941",service_name="otelcontribcol",service_version="0.102.0-dev",le="5"} 1
otelcol_loadbalancer_backend_latency_bucket{endpoint="127.0.0.1:7317",service_instance_id="660642c9-c94c-48ae-abf3-3808f8562941",service_name="otelcontribcol",service_version="0.102.0-dev",le="10"} 1
otelcol_loadbalancer_backend_latency_bucket{endpoint="127.0.0.1:7317",service_instance_id="660642c9-c94c-48ae-abf3-3808f8562941",service_name="otelcontribcol",service_version="0.102.0-dev",le="20"} 1
otelcol_loadbalancer_backend_latency_bucket{endpoint="127.0.0.1:7317",service_instance_id="660642c9-c94c-48ae-abf3-3808f8562941",service_name="otelcontribcol",service_version="0.102.0-dev",le="50"} 1
otelcol_loadbalancer_backend_latency_bucket{endpoint="127.0.0.1:7317",service_instance_id="660642c9-c94c-48ae-abf3-3808f8562941",service_name="otelcontribcol",service_version="0.102.0-dev",le="100"} 1
otelcol_loadbalancer_backend_latency_bucket{endpoint="127.0.0.1:7317",service_instance_id="660642c9-c94c-48ae-abf3-3808f8562941",service_name="otelcontribcol",service_version="0.102.0-dev",le="200"} 1
otelcol_loadbalancer_backend_latency_bucket{endpoint="127.0.0.1:7317",service_instance_id="660642c9-c94c-48ae-abf3-3808f8562941",service_name="otelcontribcol",service_version="0.102.0-dev",le="500"} 1
otelcol_loadbalancer_backend_latency_bucket{endpoint="127.0.0.1:7317",service_instance_id="660642c9-c94c-48ae-abf3-3808f8562941",service_name="otelcontribcol",service_version="0.102.0-dev",le="1000"} 1
otelcol_loadbalancer_backend_latency_bucket{endpoint="127.0.0.1:7317",service_instance_id="660642c9-c94c-48ae-abf3-3808f8562941",service_name="otelcontribcol",service_version="0.102.0-dev",le="2000"} 1
otelcol_loadbalancer_backend_latency_bucket{endpoint="127.0.0.1:7317",service_instance_id="660642c9-c94c-48ae-abf3-3808f8562941",service_name="otelcontribcol",service_version="0.102.0-dev",le="5000"} 1
otelcol_loadbalancer_backend_latency_bucket{endpoint="127.0.0.1:7317",service_instance_id="660642c9-c94c-48ae-abf3-3808f8562941",service_name="otelcontribcol",service_version="0.102.0-dev",le="+Inf"} 1
otelcol_loadbalancer_backend_latency_sum{endpoint="127.0.0.1:7317",service_instance_id="660642c9-c94c-48ae-abf3-3808f8562941",service_name="otelcontribcol",service_version="0.102.0-dev"} 0
otelcol_loadbalancer_backend_latency_count{endpoint="127.0.0.1:7317",service_instance_id="660642c9-c94c-48ae-abf3-3808f8562941",service_name="otelcontribcol",service_version="0.102.0-dev"} 1
# HELP otelcol_loadbalancer_backend_outcome Number of success/failures for each endpoint.
# TYPE otelcol_loadbalancer_backend_outcome counter
otelcol_loadbalancer_backend_outcome{endpoint="127.0.0.1:5317",service_instance_id="660642c9-c94c-48ae-abf3-3808f8562941",service_name="otelcontribcol",service_version="0.102.0-dev",success="true"} 1
otelcol_loadbalancer_backend_outcome{endpoint="127.0.0.1:6317",service_instance_id="660642c9-c94c-48ae-abf3-3808f8562941",service_name="otelcontribcol",service_version="0.102.0-dev",success="true"} 1
otelcol_loadbalancer_backend_outcome{endpoint="127.0.0.1:7317",service_instance_id="660642c9-c94c-48ae-abf3-3808f8562941",service_name="otelcontribcol",service_version="0.102.0-dev",success="true"} 1
# HELP otelcol_loadbalancer_num_backend_updates Number of times the list of backends was updated.
# TYPE otelcol_loadbalancer_num_backend_updates counter
otelcol_loadbalancer_num_backend_updates{resolver="static",service_instance_id="660642c9-c94c-48ae-abf3-3808f8562941",service_name="otelcontribcol",service_version="0.102.0-dev"} 2
# HELP otelcol_loadbalancer_num_backends Current number of backends in use.
# TYPE otelcol_loadbalancer_num_backends gauge
otelcol_loadbalancer_num_backends{resolver="static",service_instance_id="660642c9-c94c-48ae-abf3-3808f8562941",service_name="otelcontribcol",service_version="0.102.0-dev"} 3
# HELP otelcol_loadbalancer_num_resolutions Number of times the resolver triggered a new resolutions.
# TYPE otelcol_loadbalancer_num_resolutions counter
otelcol_loadbalancer_num_resolutions{resolver="static",service_instance_id="660642c9-c94c-48ae-abf3-3808f8562941",service_name="otelcontribcol",service_version="0.102.0-dev",success="true"} 2
```

Tested with this configuration file:
```yaml
receivers:
  otlp/loadbalancer:
    protocols:
      grpc:
        endpoint: 127.0.0.1:4317
  otlp/backend-1:
    protocols:
      grpc:
        endpoint: 127.0.0.1:5317
  otlp/backend-2:
    protocols:
      grpc:
        endpoint: 127.0.0.1:6317
  otlp/backend-3:
    protocols:
      grpc:
        endpoint: 127.0.0.1:7317

processors:

exporters:
  nop:
  loadbalancing:
    protocol:
      otlp:
        tls:
          insecure: true
    resolver:
      static:
        hostnames:
        - 127.0.0.1:5317
        - 127.0.0.1:6317
        - 127.0.0.1:7317

service:
  pipelines:
    traces/loadbalancer:
      receivers: [ otlp/loadbalancer ]
      processors: []
      exporters: [ loadbalancing ]
    traces/backends:
      receivers: [ otlp/backend-1, otlp/backend-2, otlp/backend-3 ]
      processors: []
      exporters: [ nop ]
    logs/loadbalancer:
      receivers: [ otlp/loadbalancer ]
      processors: []
      exporters: [ loadbalancing ]
    logs/backends:
      receivers: [ otlp/backend-1, otlp/backend-2, otlp/backend-3 ]
      processors: []
      exporters: [ nop ]
```

And this was the test command:
```terminal
telemetrygen traces --traces 100 --otlp-insecure --otlp-attributes='vip="false"'
```

Closes #33472

Signed-off-by: Juraci Paixão Kröhling <[email protected]>

---------

Signed-off-by: Juraci Paixão Kröhling <[email protected]>
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@jpkrohling
jpkrohling authored Jun 20, 2024
1 parent e362c5d commit 40b334a
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47 changes: 47 additions & 0 deletions exporter/loadbalancingexporter/documentation.md
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@@ -0,0 +1,47 @@
[comment]: <> (Code generated by mdatagen. DO NOT EDIT.)

# loadbalancing

## Internal Telemetry

The following telemetry is emitted by this component.

### loadbalancer_backend_latency

Response latency in ms for the backends.

| Unit | Metric Type | Value Type |
| ---- | ----------- | ---------- |
| ms | Histogram | Int |

### loadbalancer_backend_outcome

Number of successes and failures for each endpoint.

| Unit | Metric Type | Value Type | Monotonic |
| ---- | ----------- | ---------- | --------- |
| {outcomes} | Sum | Int | true |

### loadbalancer_num_backend_updates

Number of times the list of backends was updated.

| Unit | Metric Type | Value Type | Monotonic |
| ---- | ----------- | ---------- | --------- |
| {updates} | Sum | Int | true |

### loadbalancer_num_backends

Current number of backends in use.

| Unit | Metric Type | Value Type |
| ---- | ----------- | ---------- |
| {backends} | Gauge | Int |

### loadbalancer_num_resolutions

Number of times the resolver has triggered new resolutions.

| Unit | Metric Type | Value Type | Monotonic |
| ---- | ----------- | ---------- | --------- |
| {resolutions} | Sum | Int | true |
3 changes: 0 additions & 3 deletions exporter/loadbalancingexporter/factory.go
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Original file line number Diff line number Diff line change
Expand Up @@ -8,7 +8,6 @@ package loadbalancingexporter // import "github.com/open-telemetry/opentelemetry
import (
"context"

"go.opencensus.io/stats/view"
"go.opentelemetry.io/collector/component"
"go.opentelemetry.io/collector/exporter"
"go.opentelemetry.io/collector/exporter/otlpexporter"
Expand All @@ -18,8 +17,6 @@ import (

// NewFactory creates a factory for the exporter.
func NewFactory() exporter.Factory {
_ = view.Register(metricViews()...)

return exporter.NewFactory(
metadata.Type,
createDefaultConfig,
Expand Down
76 changes: 76 additions & 0 deletions exporter/loadbalancingexporter/generated_component_telemetry_test.go
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2 changes: 1 addition & 1 deletion exporter/loadbalancingexporter/generated_package_test.go
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8 changes: 4 additions & 4 deletions exporter/loadbalancingexporter/go.mod
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Original file line number Diff line number Diff line change
Expand Up @@ -12,16 +12,18 @@ require (
github.com/open-telemetry/opentelemetry-collector-contrib/pkg/golden v0.103.0
github.com/open-telemetry/opentelemetry-collector-contrib/pkg/pdatatest v0.103.0
github.com/stretchr/testify v1.9.0
go.opencensus.io v0.24.0
go.opentelemetry.io/collector/component v0.103.0
go.opentelemetry.io/collector/config/configtelemetry v0.103.0
go.opentelemetry.io/collector/confmap v0.103.0
go.opentelemetry.io/collector/consumer v0.103.0
go.opentelemetry.io/collector/exporter v0.103.0
go.opentelemetry.io/collector/exporter/otlpexporter v0.103.0
go.opentelemetry.io/collector/otelcol v0.103.0
go.opentelemetry.io/collector/pdata v1.10.0
go.opentelemetry.io/collector/semconv v0.103.0
go.opentelemetry.io/otel v1.27.0
go.opentelemetry.io/otel/metric v1.27.0
go.opentelemetry.io/otel/sdk/metric v1.27.0
go.opentelemetry.io/otel/trace v1.27.0
go.uber.org/goleak v1.3.0
go.uber.org/multierr v1.11.0
Expand Down Expand Up @@ -101,14 +103,14 @@ require (
github.com/tklauser/go-sysconf v0.3.12 // indirect
github.com/tklauser/numcpus v0.6.1 // indirect
github.com/yusufpapurcu/wmi v1.2.4 // indirect
go.opencensus.io v0.24.0 // indirect
go.opentelemetry.io/collector v0.103.0 // indirect
go.opentelemetry.io/collector/config/configauth v0.103.0 // indirect
go.opentelemetry.io/collector/config/configcompression v1.10.0 // indirect
go.opentelemetry.io/collector/config/configgrpc v0.103.0 // indirect
go.opentelemetry.io/collector/config/confignet v0.103.0 // indirect
go.opentelemetry.io/collector/config/configopaque v1.10.0 // indirect
go.opentelemetry.io/collector/config/configretry v0.103.0 // indirect
go.opentelemetry.io/collector/config/configtelemetry v0.103.0 // indirect
go.opentelemetry.io/collector/config/configtls v0.103.0 // indirect
go.opentelemetry.io/collector/config/internal v0.103.0 // indirect
go.opentelemetry.io/collector/confmap/converter/expandconverter v0.103.0 // indirect
Expand All @@ -128,7 +130,6 @@ require (
go.opentelemetry.io/contrib/config v0.7.0 // indirect
go.opentelemetry.io/contrib/instrumentation/google.golang.org/grpc/otelgrpc v0.52.0 // indirect
go.opentelemetry.io/contrib/propagators/b3 v1.27.0 // indirect
go.opentelemetry.io/otel v1.27.0 // indirect
go.opentelemetry.io/otel/bridge/opencensus v1.27.0 // indirect
go.opentelemetry.io/otel/exporters/otlp/otlpmetric/otlpmetricgrpc v1.27.0 // indirect
go.opentelemetry.io/otel/exporters/otlp/otlpmetric/otlpmetrichttp v1.27.0 // indirect
Expand All @@ -139,7 +140,6 @@ require (
go.opentelemetry.io/otel/exporters/stdout/stdoutmetric v1.27.0 // indirect
go.opentelemetry.io/otel/exporters/stdout/stdouttrace v1.27.0 // indirect
go.opentelemetry.io/otel/sdk v1.27.0 // indirect
go.opentelemetry.io/otel/sdk/metric v1.27.0 // indirect
go.opentelemetry.io/proto/otlp v1.2.0 // indirect
golang.org/x/exp v0.0.0-20240506185415-9bf2ced13842 // indirect
golang.org/x/net v0.26.0 // indirect
Expand Down
75 changes: 74 additions & 1 deletion exporter/loadbalancingexporter/internal/metadata/generated_telemetry.go
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13 changes: 13 additions & 0 deletions exporter/loadbalancingexporter/internal/metadata/generated_telemetry_test.go
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Some generated files are not rendered by default. Learn more about how customized files appear on GitHub.

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