Add the ability to set buffer sizes for the tempo service

Signed-off-by: Pete Wall <[email protected]>
grafana · Sep 19, 2024 · 4e2d328 · 4e2d328
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diff --git a/charts/k8s-monitoring/README.md b/charts/k8s-monitoring/README.md
@@ -367,6 +367,7 @@ The Prometheus and Loki services may be hosted on the same cluster, or remotely
 | externalServices.tempo.host | string | `""` | Tempo host where traces will be sent |
 | externalServices.tempo.hostKey | string | `"host"` | The key for the host property in the secret |
 | externalServices.tempo.protocol | string | `"otlp"` | The type of server protocol for writing metrics Options:   * "otlp" will use OTLP   * "otlphttp" will use OTLP HTTP |
+| externalServices.tempo.readBufferSize | string | `""` | Size of the read buffer the gRPC client to use for reading server responses. |
 | externalServices.tempo.searchEndpoint | string | `"/api/search"` | Tempo search endpoint. |
 | externalServices.tempo.secret.create | bool | `true` | Should this Helm chart create the secret. If false, you must define the name and namespace values. |
 | externalServices.tempo.secret.name | string | `""` | The name of the secret. |
@@ -375,6 +376,7 @@ The Prometheus and Loki services may be hosted on the same cluster, or remotely
 | externalServices.tempo.tenantIdKey | string | `"tenantId"` | The key for the tenant ID property in the secret |
 | externalServices.tempo.tls | object | `{}` | [TLS settings](https://grafana.com/docs/alloy/latest/reference/components/otelcol.exporter.otlp/#tls-block) to configure for the traces service. |
 | externalServices.tempo.tlsOptions | string | `""` | Define the [TLS block](https://grafana.com/docs/alloy/latest/reference/components/otelcol.exporter.otlp/#tls-block). Example: `tlsOptions: insecure = true` This option will be deprecated and removed soon. Please switch to `tls` and use yaml format. |
+| externalServices.tempo.writeBufferSize | string | `""` | Size of the write buffer the gRPC client to use for writing requests. |
 
 ### Metrics Global
 

diff --git a/charts/k8s-monitoring/templates/alloy_config/_traces_service.alloy.txt b/charts/k8s-monitoring/templates/alloy_config/_traces_service.alloy.txt
@@ -31,6 +31,12 @@ otelcol.exporter.otlphttp "traces_service" {
       {{ $key | quote }} = {{ $value }},
 {{- end }}
     }
+{{- if .readBufferSize }}
+    read_buffer_size = {{ .readBufferSize | quote }}
+{{- end }}
+{{- if .writeBufferSize }}
+    write_buffer_size = {{ .writeBufferSize | quote }}
+{{- end }}
 {{- if .tlsOptions }}
     tls {
 {{ .tlsOptions | indent 6 }}

diff --git a/charts/k8s-monitoring/values.yaml b/charts/k8s-monitoring/values.yaml
@@ -470,6 +470,14 @@ externalServices:
     # @section -- External Services (Tempo)
     tlsOptions: ""
 
+    # -- Size of the read buffer the gRPC client to use for reading server responses.
+    # @section -- External Services (Tempo)
+    readBufferSize: ""
+
+    # -- Size of the write buffer the gRPC client to use for writing requests.
+    # @section -- External Services (Tempo)
+    writeBufferSize: ""
+
   # Connection information for Grafana Pyroscope
   pyroscope:
     # -- Pyroscope host where profiles will be sent

diff --git a/examples/traces-enabled/README.md b/examples/traces-enabled/README.md
@@ -25,6 +25,7 @@ externalServices:
     basicAuth:
       username: 12345
       password: "It's a secret to everyone"
+    writeBufferSize: "1024KiB"
 
 traces:
   enabled: true

diff --git a/examples/traces-enabled/metrics.alloy b/examples/traces-enabled/metrics.alloy
diff --git a/examples/traces-enabled/output.yaml b/examples/traces-enabled/output.yaml
diff --git a/examples/traces-enabled/values.yaml b/examples/traces-enabled/values.yaml
@@ -18,6 +18,7 @@ externalServices:
     basicAuth:
       username: 12345
       password: "It's a secret to everyone"
+    writeBufferSize: "1024KiB"
 
 traces:
   enabled: true