Set DSTACK_OTEL_METRICS_EXPORTERS=otlp by default#4041
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Follows #4034
Prometheus scraping OpenTelemetry metrics via /metrics does not work correctly when the dstack server is deployed behind a load balancer since scrapes from different replicas are interleaved. So we always set DSTACK_OTEL_METRICS_EXPORTERS=otlp.
Users can still force OTel metrics in /metrics via
DSTACK_OTEL_METRICS_EXPORTERS=prometheus.For the same reason, we remove/deprecate other non-workload Prometheus metrics that are now replaced with OTel metrics:
dstack_server_requests_totalanddstack_server_request_duration_secondsmetrics.