Bug report for failed CircleCI build (job: loadtest)

[owais]

Auto-generated report for loadtest job build.

Link to failed build: https://circleci.com/gh/open-telemetry/opentelemetry-collector/74316

Test Failures

• TestTraceNoBackend10kSPS
• TestTraceNoBackend10kSPS/MemoryLimit

Note: Information about any subsequent build failures that happen while
this issue is open, will be added as comments with more information to this issue.

[owais]

Link to latest failed build: https://circleci.com/gh/open-telemetry/opentelemetry-collector/76252

Test Failures

• TestTrace1kSPSWithAttrs
• TestTrace1kSPSWithAttrs/10*1000bytes

[jpkrohling]

Failed here as well: https://github.com/open-telemetry/opentelemetry-collector/pull/3340/checks?check_run_id=2729774993

=== RUN   TestTraceNoBackend10kSPS/NoMemoryLimit
2021/06/02 16:30:41 Starting Agent (/home/runner/work/opentelemetry-collector/opentelemetry-collector/bin/otelcol_linux_amd64)
2021/06/02 16:30:41 Writing Agent log to /home/runner/work/opentelemetry-collector/opentelemetry-collector/testbed/tests/results/TestTraceNoBackend10kSPS/NoMemoryLimit/agent.log
2021/06/02 16:30:41 Agent running, pid=7552
2021/06/02 16:30:41 Starting load generator at 10000 items/sec.
2021/06/02 16:30:44 Agent RAM (RES):   0 MiB, CPU: 0.0% | Sent:     23630 items | Received:         0 items (0/sec)
2021/06/02 16:30:47 Agent RAM (RES):  92 MiB, CPU:33.0% | Sent:     47830 items | Received:         0 items (0/sec)
2021/06/02 16:30:47 Cannot send traces: failed to push trace data via OTLP exporter: Permanent error: rpc error: code = Unknown desc = sending_queue is full
2021/06/02 16:30:50 Agent RAM (RES): 120 MiB, CPU:33.7% | Sent:     72900 items | Received:         0 items (0/sec)
2021/06/02 16:30:53 Agent RAM (RES): 150 MiB, CPU:31.0% | Sent:     97660 items | Received:         0 items (0/sec)
2021/06/02 16:30:53 Performance error: RAM consumption is 171 MiB, max expected is 170 MiB
2021/06/02 16:30:53 Gracefully terminating Agent pid=7552, sending SIGTEM...
2021/06/02 16:30:53 Cannot send traces: failed to push trace data via OTLP exporter: rpc error: code = Unavailable desc = connection error: desc = "transport: Error while dialing dial tcp 127.0.0.1:38253: connect: connection refused"
2021/06/02 16:30:53 Agent process stopped, exit code=0
2021/06/02 16:30:53 RAM consumption is 171 MiB, max expected is 170 MiB
    test_case.go:334: RAM consumption is 171 MiB, max expected is 170 MiB
    assertion_compare.go:332: 
        	Error Trace:	scenarios.go:320
        	            				trace_test.go:165
        	Error:      	"100" is not less than "0"
        	Test:       	TestTraceNoBackend10kSPS/NoMemoryLimit
        	Messages:   	[]
2021/06/02 16:30:53 Stopped generator. Sent:     99150 items