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feat: Basic OpenTelemetry and Datadog support (#397)
Switch to pluggable design so that some monitoring functions can report to something other than New Relic. Still defaults to just New Relic, but new setting allows adding OpenTelemetry or Datadog, or removing New Relic. Initialization and configuration of OpenTelemetry is left as an exercise to the deployer, but https://github.com/mitodl/open-edx-plugins/tree/main/src/ol_openedx_otel_monitoring/ would be a likely candidate. Part of #389
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,180 @@ | ||
| """ | ||
| Telemetry abstraction and backends that implement it. | ||
| Only a certain subset of the monitoring functions have been made | ||
| configurable via this module. | ||
| """ | ||
|
|
||
| import logging | ||
| import sys | ||
| from abc import ABC, abstractmethod | ||
| from functools import lru_cache | ||
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| from django.conf import settings | ||
| from django.dispatch import receiver | ||
| from django.test.signals import setting_changed | ||
| from django.utils.module_loading import import_string | ||
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| log = logging.getLogger(__name__) | ||
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| # The newrelic package used to not be part of the requirements files | ||
| # and so a try-import was used here. This situation is no longer true, | ||
| # but we're still preserving that pattern until someone feels like | ||
| # doing the work to remove it. (Should just be a major version bump | ||
| # and communication to anyone who might be specifically removing the | ||
| # package for some reason.) | ||
| # | ||
| # Ticket for just doing an unconditional import: | ||
| # https://github.com/openedx/edx-django-utils/issues/396 | ||
| try: | ||
| import newrelic.agent | ||
| except ImportError: # pragma: no cover | ||
| newrelic = None # pylint: disable=invalid-name | ||
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| class TelemetryBackend(ABC): | ||
| """ | ||
| Base class for telemetry sinks. | ||
| """ | ||
| @abstractmethod | ||
| def set_attribute(self, key, value): | ||
| """ | ||
| Set a key-value attribute on a span. This might be the current | ||
| span or it might the root span of the process, depending on | ||
| the backend. | ||
| """ | ||
|
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| @abstractmethod | ||
| def record_exception(self): | ||
| """ | ||
| Record the exception that is currently being handled. | ||
| """ | ||
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| class NewRelicBackend(TelemetryBackend): | ||
| """ | ||
| Send telemetry to New Relic. | ||
| https://docs.newrelic.com/docs/apm/agents/python-agent/python-agent-api/guide-using-python-agent-api/ | ||
| """ | ||
| def __init__(self): | ||
| if newrelic is None: | ||
| raise Exception("Could not load New Relic monitoring backend; package not present.") | ||
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| def set_attribute(self, key, value): | ||
| # Sets attribute on the transaction, rather than the current | ||
| # span, matching historical behavior. There is also an | ||
| # `add_custom_span_attribute` that would better match | ||
| # OpenTelemetry's behavior, which we could try exposing | ||
| # through a new, more specific TelemetryBackend method. | ||
| # | ||
| # TODO: Update to newer name `add_custom_attribute` | ||
| # https://docs.newrelic.com/docs/apm/agents/python-agent/python-agent-api/addcustomparameter-python-agent-api/ | ||
| newrelic.agent.add_custom_parameter(key, value) | ||
|
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| def record_exception(self): | ||
| # TODO: Replace with newrelic.agent.notice_error() | ||
| # https://docs.newrelic.com/docs/apm/agents/python-agent/python-agent-api/recordexception-python-agent-api/ | ||
| newrelic.agent.record_exception() | ||
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| class OpenTelemetryBackend(TelemetryBackend): | ||
| """ | ||
| Send telemetry via OpenTelemetry. | ||
| Requirements to use: | ||
| - Install `opentelemetry-api` Python package | ||
| - Configure and initialize OpenTelemetry | ||
| API reference: https://opentelemetry-python.readthedocs.io/en/latest/ | ||
| """ | ||
| # pylint: disable=import-outside-toplevel | ||
| def __init__(self): | ||
| # If import fails, the backend won't be used. | ||
| from opentelemetry import trace | ||
| self.otel_trace = trace | ||
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| def set_attribute(self, key, value): | ||
| # Sets the value on the current span, not necessarily the root | ||
| # span in the process. | ||
| self.otel_trace.get_current_span().set_attribute(key, value) | ||
|
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| def record_exception(self): | ||
| self.otel_trace.get_current_span().record_exception(sys.exc_info()[1]) | ||
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| class DatadogBackend(TelemetryBackend): | ||
| """ | ||
| Send telemetry to Datadog via ddtrace. | ||
| Requirements to use: | ||
| - Install `ddtrace` Python package | ||
| - Initialize ddtrace, either via ddtrace-run or ddtrace.auto | ||
| API reference: https://ddtrace.readthedocs.io/en/stable/api.html | ||
| """ | ||
| # pylint: disable=import-outside-toplevel | ||
| def __init__(self): | ||
| # If import fails, the backend won't be used. | ||
| from ddtrace import tracer | ||
| self.dd_tracer = tracer | ||
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| def set_attribute(self, key, value): | ||
| if root_span := self.dd_tracer.current_root_span(): | ||
| root_span.set_tag(key, value) | ||
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| def record_exception(self): | ||
| if span := self.dd_tracer.current_span(): | ||
| span.set_traceback() | ||
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| # We're using an lru_cache instead of assigning the result to a variable on | ||
| # module load. With the default settings (pointing to a TelemetryBackend | ||
| # in this very module), this function can't be successfully called until | ||
| # the module finishes loading, otherwise we get a circular import error | ||
| # that will cause the backend to be dropped from the list. | ||
| @lru_cache | ||
| def configured_backends(): | ||
| """ | ||
| Produce a list of TelemetryBackend instances from Django settings. | ||
| """ | ||
| # .. setting_name: OPENEDX_TELEMETRY | ||
| # .. setting_default: ['edx_django_utils.monitoring.NewRelicBackend'] | ||
| # .. setting_description: List of telemetry backends to send data to. Allowable values | ||
| # are dotted module paths to classes implementing `edx_django_utils.monitoring.TelemetryBackend`, | ||
| # such as the built-in `NewRelicBackend`, `OpenTelemetryBackend`, and `DatadogBackend` | ||
| # (in the same module). For historical reasons, this defaults to just | ||
| # New Relic, and not all monitoring features will report to all backends (New Relic | ||
| # having the broadest support). Unusable options are ignored. Configuration | ||
| # of the backends themselves is via environment variables and system config files | ||
| # rather than via Django settings. | ||
| backend_classes = getattr(settings, 'OPENEDX_TELEMETRY', None) | ||
| if isinstance(backend_classes, str): | ||
| # Prevent a certain kind of easy mistake. | ||
| raise Exception("OPENEDX_TELEMETRY must be a list, not a string.") | ||
| if backend_classes is None: | ||
| backend_classes = ['edx_django_utils.monitoring.NewRelicBackend'] | ||
|
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| backends = [] | ||
| for backend_class in backend_classes: | ||
| try: | ||
| cls = import_string(backend_class) | ||
| if issubclass(cls, TelemetryBackend): | ||
| backends.append(cls()) | ||
| else: | ||
| log.warning( | ||
| f"Could not load OPENEDX_TELEMETRY option {backend_class!r}: " | ||
| f"{cls} is not a subclass of TelemetryBackend" | ||
| ) | ||
| except BaseException as e: | ||
| log.warning(f"Could not load OPENEDX_TELEMETRY option {backend_class!r}: {e!r}") | ||
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| return backends | ||
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| @receiver(setting_changed) | ||
| def _reset_state(sender, **kwargs): # pylint: disable=unused-argument | ||
| """Reset caches when settings change during unit tests.""" | ||
| configured_backends.cache_clear() |
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