Update prometheus exporter package (fixes issues with build info gaug…

…e when using OTEL) (#92)

* Update opentelemetry packages

* Update opentelemetry-exporter-prometheus to fix issues with build_info gauge when using otel tracker

* Revert lockfile

* Update opentelemetry-exporter-prometheus

* Remove the prometheus exporter "prefix" config option

pyproject.toml

@@ -25,7 +25,10 @@ classifiers = [
 packages = [{ include = "autometrics", from = "src" }]
 
 [tool.poetry.dependencies]
-opentelemetry-exporter-prometheus = "^1.12.0rc1"
+# The prometheus exporter is pinned to a beta version because of how opentelemetry-python has been releasing it.
+# Technically, the version 1.12.0rc1 is the "latest" on pypi, but it's not the latest release.
+# 0.41b0 includes the fix for exporting gauge values (previously they were always turned into counters).
+opentelemetry-exporter-prometheus = "0.41b0"
 opentelemetry-exporter-otlp-proto-http = { version = "^1.20.0", optional = true }
 opentelemetry-exporter-otlp-proto-grpc = { version = "^1.20.0", optional = true }
 opentelemetry-sdk = "^1.17.0"

src/autometrics/exposition.py

@@ -70,7 +70,6 @@ class PrometheusExporterOptions(PrometheusExporterBase, total=False):
 
     address: str
     port: int
-    prefix: str
 
 
 PrometheusValidator = TypeAdapter(PrometheusExporterOptions)
@@ -108,9 +107,7 @@ def create_exporter(config: ExporterOptions) -> Optional[MetricReader]:
             config.get("port", 9464),
             config.get("address", "0.0.0.0"),
         )
-        return PrometheusMetricReader(
-            config.get("prefix", ""),
-        )
+        return PrometheusMetricReader()
     if config["type"] == "otlp-proto-http":
         config = OtlpHttpExporterValidator.validate_python(config)
         try:

src/autometrics/tracker/opentelemetry.py

@@ -65,7 +65,7 @@ def __init__(self, reader: Optional[MetricReader] = None):
             ),
         )
         resource = Resource.create(get_resource_attrs())
-        readers = [reader or PrometheusMetricReader("")]
+        readers = [reader or PrometheusMetricReader()]
         meter_provider = MeterProvider(
             views=[view],
             resource=resource,