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+# Internal Telemetry Logging Pipeline
+
+This documents the choices available in the internal logging
+configuration object in
+`otap_df_config::pipeline::service::telemetry::logs`. See the
+[internal telemetry crate's README](../crates/telemetry/README.md) for
+the motivation behind this configuration as well as for a description
+of the internal metrics pipeline.
+
+## Overview
+
+The internal telemetry SDK is designed for the engine to safely
+consume its own telemetry, and we intend for the self-hosted telemetry
+pipeline to be the standard configuration for all OpenTelemetry
+signals.
+
+Consuming self-generated telemetry presents a potential
+feedback loop, situations where a telemetry pipeline creates pressure
+on itself. We have designed for the OTAP dataflow engine to remain
+reliable even with this kind of dependency on itself.
+
+## Internal Telemetry Receiver (ITR)
+
+The Internal Telemetry Receiver or "ITR" is an OTAP-Dataflow receiver
+component that receives telemetry from internal sources and sends
+to an internal telemetry pipeline. An internal
+telemetry pipeline consists of one (global) or more (NUMA-regional)
+ITR components and any of the connected processor and exporter
+components reachable from ITR source nodes.
+
+## Logs instrumentation
+
+The OTAP Dataflow engine has dedicated macros, and every component is
+configured with an internal telemetry SDK meant for primary
+instrumentation. Using the `otel_info!(effect, name, args...)` macro
+requires access the component EffectHandler. This is considered
+first-party internal logging, and other uses of Tokio `tracing` are
+considered third-party internal logging.
+
+## Pitfall avoidance
+
+The OTAP-Dataflow engine is safeguarded against many self-induced
+telemetry pitfalls, as follows:
+
+- OTAP-Dataflow components reachable from an ITR cannot be configured
+  to send to an ITR node. This avoids a direct feedback cycle for
+  internal telemetry because the components cannot reach
+  themselves. For example, ITR and downstream components may be
+  configured for raw logging.
+- Use of dedicated thread(s) for internal telemetry output.
+- Thread-local state to avoid third-party instrumentation in
+  dedicated internal telemetry threads.
+- Components under observation (non-ITR components) use
+  per-engine-core internal logs buffer, allowing overflow.
+- Non-blocking interfaces. We prefer to drop and count dropped
+  internal log events than to block the pipeline.
+- Option to configure internal telemetry multiple ways, including the
+  no-op implementation, global or regional logs consumers, buffered and
+  unbuffered.
+
+## OTLP-bytes first
+
+As a key design decision, the OTAP-Dataflow internal telemetry data
+path produces a partially encoded OTLP-bytes representation first.
+This is an intermediate format,
+`otap_df_telemetry::self_tracing::LogRecord` which include the
+timestamp, callsite metadata, and the OTLP bytes encoding of the body
+and attrbutes.
+
+Because OTLP bytes is one of the builtin `OtapPayload` formats, it is
+simple to get from a slic of `LogRecord` to the `OtapPayload` we need
+to consume internal telemetry.  To obtain the partial bytes encoding
+needed, we have a custom [Tokio `tracing` Event][TOKIOEVENT] handler
+based on `otap_df_pdata::otlp::common::ProtoBuffer`.
+
+[TOKIOEVENT]: https://docs.rs/tracing/latest/tracing/struct.Event.html
+
+## Raw logging
+
+We support formatting events for direct printing to the console from
+OTLP bytes. For the dynamic encoding, these are consumed using
+`otap_df_pdata::views::logs::LogsDataView`, making the operation
+zero-copy. We refer to this most-basic form of printing to the console
+as raw logging because it is a safe configuration that avoids feedback
+for internal logging.
+
+Note: Raw logging is likely to introduce contention over the console.
+
+In cases where internal logging code is forced to handle its own
+errors, the `otap_df_telemetry::raw_error!` macro is meant for
+emergency use, to report about failures to log.
+
+## Logging provider modes
+
+The logging configuration supports multiple distinct provider mode
+settings:
+
+- Global: The default Tokio subscriber, this will apply in threads
+  that do not belong to an OTAP dataflow engine core.
+- Engine: This is the default configuration for engine core threads.
+- Internal: This is the default configuration for internal telemetry
+  pipeline components.
+
+Provider mode values are:
+
+- Noop: Ignore these producers
+- Unbuffered: Use a non-blocking write to the internal logs channel.
+  Unbuffered is the default for the global provider.
+- Buffered: Use a thread-local buffer, requires managed flushing.
+  The global provider is not supported for buffered logging.
+- OpenTelemetry: Use the OpenTelemetry SDK. This option has the most
+  comprehensive obsevability, including OpenTelemetry traces
+  integration.
+- Raw: Use the raw logger, meaning to synchronously write to the
+  console. For asynchronous console logging instead, use Buffered or
+  Unbuffered provider mod and set the Raw output mode.
+
+## Output modes
+
+When any of the providers use Buffered or Unbuffered modes, an
+engine-managed thread is responsible for consuming internal logs. This
+`LogsCollector` thread is currently global, but could be NUMA-regional
+as described in [README](./README.md), and it can be configured currently
+for raw or internal logging.
+
+The output modes are:
+
+- Noop: Not a real output mode, this setting will cause an error when
+  any provider uses Buffered or Unbuffered.
+- Raw: Use raw console logging from the global or regional logging
+  thread.
+- Internal: Use an Internal Telemetry Receiver as the destination.
+
+## Default configuration
+
+In this configuration, a dedicated `LogsCollector` thread consumes
+from the channel and prints to console.
+
+```yaml
+service:
+  telemetry:
+    logs:
+      level: info
+      providers:
+        global: unbuffered
+        engine: buffered
+        internal: noop
+      output: raw
+```
+
+```mermaid
+flowchart LR
+    subgraph "Thread Contexts"
+        G[Global Threads<br/>HTTP admin, etc.]
+        E[Engine Threads<br/>Pipeline cores]
+        I[Internal Threads<br/>ITR components]
+    end
+
+    subgraph "Provider Layers"
+        UL[UnbufferedLayer<br/>immediate send]
+        BL[ThreadBufferedLayer<br/>thread-local buffer]
+        NL[Noop<br/>dropped]
+    end
+
+    subgraph "Channel"
+        CH[(flume channel)]
+    end
+
+    subgraph "Output"
+        LC[LogsCollector Thread]
+        CON[Console<br/>stdout/stderr]
+    end
+
+    G -->|tracing event| UL
+    E -->|tracing event| BL
+    I -->|tracing event| NL
+
+    UL -->|LogPayload::Singleton| CH
+    BL -->|periodic flush<br/>LogPayload::Batch| CH
+    NL -.->|discarded| X[null]
+
+    CH --> LC
+    LC -->|raw format| CON
+```
+
+## Internal Telemetry Receiver configuration
+
+In this configuration, the `InternalTelemetryReceiver` node consumes
+from the channel and emits `OtapPayload::ExportLogsRequest` into the
+pipeline.
+
+```yaml
+service:
+  telemetry:
+    logs:
+      level: info
+      providers:
+        global: unbuffered
+        engine: buffered
+        internal: noop
+      output: internal
+
+nodes:
+  internal_telemetry:
+    kind: receiver
+    plugin_urn: "urn:otel:otlp:telemetry:receiver"
+    out_ports:
+      out_port:
+        destinations:
+          - otlp_exporter
+
+  otlp_exporter:
+    kind: exporer
+    ...
+```
+
+```mermaid
+flowchart LR
+    subgraph "Thread Contexts"
+        G[Global Threads<br/>HTTP admin, etc.]
+        E[Engine Threads<br/>Pipeline cores]
+        I[Internal Threads<br/>ITR components]
+    end
+
+    subgraph "Provider Layers"
+        UL[UnbufferedLayer<br/>immediate send]
+        BL[ThreadBufferedLayer<br/>thread-local buffer]
+        NL[Noop<br/>dropped]
+    end
+
+    subgraph "Channel"
+        CH[(flume channel)]
+    end
+
+    subgraph "Internal Telemetry Pipeline"
+        ITR[InternalTelemetryReceiver<br/>encodes to OTLP bytes]
+        PROC[Processors<br/>batch, filter, etc.]
+        EXP[Exporter<br/>OTLP, file, etc.]
+    end
+
+    G -->|tracing event| UL
+    E -->|tracing event| BL
+    I -->|tracing event| NL
+
+    UL -->|LogPayload::Singleton| CH
+    BL -->|periodic flush<br/>LogPayload::Batch| CH
+    NL -.->|discarded| X[null]
+
+    CH --> ITR
+    ITR -->|OtapPayload<br/>ExportLogsRequest| PROC
+    PROC --> EXP
+```