diff --git a/.github/workflows/pytest.yml b/.github/workflows/pytest.yml
index 7a3650d..21a9aaf 100644
--- a/.github/workflows/pytest.yml
+++ b/.github/workflows/pytest.yml
@@ -53,6 +53,7 @@ jobs:
           cp config.EXAMPLE/exporter.env.EXAMPLE ../config/exporter.env
           cp config.EXAMPLE/hasher.env.EXAMPLE ../config/hasher.env
           cp config.EXAMPLE/controller.env.EXAMPLE ../config/controller.env
+          cp config.EXAMPLE/monitoring.env.EXAMPLE ../config/monitoring.env
           {
             echo ""
             echo "AZURE_CLIENT_ID=${AZURE_CLIENT_ID}"
diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index a217d81..5da3d1d 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -36,7 +36,7 @@ repos:
             "types-pika",
             "types-requests",
           ]
-        files: src/
+        files: ^(src|monitoring)/
   # a collection of sanity checks: check for merge conflicts, check the end of
   # lines, check for DOS vs unix stuff, and a newline at the end of files.
   - repo: https://github.com/pre-commit/pre-commit-hooks
diff --git a/config.EXAMPLE/controller.env.EXAMPLE b/config.EXAMPLE/controller.env.EXAMPLE
index e055216..43b3af5 100644
--- a/config.EXAMPLE/controller.env.EXAMPLE
+++ b/config.EXAMPLE/controller.env.EXAMPLE
@@ -13,3 +13,6 @@ RABBITMQ_PASSWORD="my_pw"
 RABBITMQ_HOST="localhost"
 RABBITMQ_PORT=5672
 RABBITMQ_QUEUE="waveform"
+# OpenTelemetry OTLP/HTTP endpoint of the LGTM collector.
+OTEL_EXPORTER_OTLP_ENDPOINT="http://lgtm:4318"
+OTEL_SERVICE_NAME=waveform-controller
diff --git a/config.EXAMPLE/exporter.env.EXAMPLE b/config.EXAMPLE/exporter.env.EXAMPLE
index 39a4119..cd963ac 100644
--- a/config.EXAMPLE/exporter.env.EXAMPLE
+++ b/config.EXAMPLE/exporter.env.EXAMPLE
@@ -32,3 +32,7 @@ ONLY_USE_CSV_FROM_YESTERDAY=TRUE
 # specify a date to process format YYYY-MM-DD also accepts a regular
 # expression to match multiple date
 PROCESS_CSV_FROM_DATE=
+
+# OpenTelemetry OTLP/HTTP endpoint of the LGTM collector.
+OTEL_EXPORTER_OTLP_ENDPOINT="http://lgtm:4318"
+OTEL_SERVICE_NAME=waveform-exporter
diff --git a/config.EXAMPLE/monitoring.env.EXAMPLE b/config.EXAMPLE/monitoring.env.EXAMPLE
new file mode 100644
index 0000000..a71eb10
--- /dev/null
+++ b/config.EXAMPLE/monitoring.env.EXAMPLE
@@ -0,0 +1,7 @@
+# This is an EXAMPLE file, do not put real secrets in here.
+# Copy it to ../config/monitoring.env and then DELETE THIS COMMENT.
+# When does the monitoring job run
+MONITORING_CRON_SCHEDULE="*/5 * * * *"
+# OpenTelemetry OTLP/HTTP endpoint of the LGTM collector.
+OTEL_EXPORTER_OTLP_ENDPOINT="http://lgtm:4318"
+OTEL_SERVICE_NAME=waveform-monitoring
diff --git a/docker-compose.lgtm.yml b/docker-compose.lgtm.yml
new file mode 100644
index 0000000..4dbade2
--- /dev/null
+++ b/docker-compose.lgtm.yml
@@ -0,0 +1,37 @@
+# Local Grafana LGTM stack (Loki, Grafana, Tempo, Mimir/Prometheus, plus
+# an OpenTelemetry Collector).
+# In production, this would be an external service.
+#
+# Docs: https://grafana.com/docs/opentelemetry/docker-lgtm/
+#
+# Start with the waveform stack (same Compose project/network, hostname `lgtm`):
+#   docker compose -f docker-compose.yml -f docker-compose.lgtm.yml up -d
+#
+# Or start only LGTM:
+#   docker compose -p lgtm -f docker-compose.lgtm.yml up -d
+#
+# Grafana UI: http://127.0.0.1:3000
+
+services:
+  lgtm:
+    image: grafana/otel-lgtm:0.30.2
+    restart: unless-stopped
+    profiles:
+      - lgtm
+    ports:
+      # Grafana UI
+      - "127.0.0.1:3000:3000"
+      # OTLP gRPC (OpenTelemetry default)
+      - "127.0.0.1:4317:4317"
+      # OTLP HTTP (OpenTelemetry default)
+      - "127.0.0.1:4318:4318"
+      # Optional: query backends directly (Grafana already has them as datasources)
+      - "127.0.0.1:3200:3200" # Tempo
+      - "127.0.0.1:4040:4040" # Pyroscope
+      - "127.0.0.1:9090:9090" # Prometheus / Mimir
+    volumes:
+      # https://github.com/grafana/docker-otel-lgtm#persist-data-across-container-instantiation
+      - lgtm-data:/data
+
+volumes:
+  lgtm-data:
diff --git a/docker-compose.yml b/docker-compose.yml
index ba472e0..b04c1f6 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -55,3 +55,24 @@ services:
     env_file:
       - ../config/hasher.env
     restart: unless-stopped
+  waveform-monitoring:
+    # This service exists as a partly temporary measure, covering a few different cases:
+    #   * Until LGTM on the GAE can tell us disk free amount for /gae
+    #   * Stats on HL7 bz2 files on disk. Arguably done better in Emap but
+    #     I'm putting all the telemetry in one project for now.
+    #   * Disk usage stats for the waveform processing (CSVs, parquets, etc). This will likely stay here.
+    build:
+      context: .
+      dockerfile: monitoring/Dockerfile
+      args:
+        HTTP_PROXY: ${HTTP_PROXY}
+        http_proxy: ${http_proxy}
+        HTTPS_PROXY: ${HTTPS_PROXY}
+        https_proxy: ${https_proxy}
+    env_file:
+      - ../config/monitoring.env
+    volumes:
+      # we are assuming this FS layout to emap saved messages
+      - ../../waveform-saved-messages:/waveform-saved-messages:ro
+      - ../waveform-export:/waveform-export:ro
+    restart: unless-stopped
diff --git a/monitoring/Dockerfile b/monitoring/Dockerfile
new file mode 100644
index 0000000..eda6db5
--- /dev/null
+++ b/monitoring/Dockerfile
@@ -0,0 +1,40 @@
+FROM python:3.13-slim-bookworm@sha256:8092ae2ef67061f9db412458dbdce44dbf16748fb3cae5cdbd020f467a9712d0
+LABEL authors="Stephen Thompson, Jeremy Stein"
+
+RUN export DEBIAN_FRONTEND=noninteractive && \
+    apt-get update && \
+    apt-get install --yes --no-install-recommends ca-certificates curl && \
+    apt-get autoremove --yes && apt-get clean --yes && rm -rf /var/lib/apt/lists/*
+
+# Not in apt and no official docker image, so install supercronic from: https://github.com/aptible/supercronic/releases
+ARG SUPERCRONIC_VERSION=v0.2.49
+ARG TARGETARCH
+# don't use SHA1 as per instructions as it's insecure
+RUN case "${TARGETARCH}" in \
+    amd64) SUPERCRONIC_SHA256SUM=a53ae236602c7338aba3fbaff40bda6300eae3b9fedb8261eb06cfe3724430c1 ;; \
+    arm64) SUPERCRONIC_SHA256SUM=02aa0cb229ba09050cba6638059dadb9eedc2276632ea43d6a57a2f8c1629dd5 ;; \
+    *) echo "Unsupported TARGETARCH: ${TARGETARCH}" >&2; exit 1 ;; \
+    esac \
+    && SUPERCRONIC=supercronic-linux-${TARGETARCH} \
+    && SUPERCRONIC_URL=https://github.com/aptible/supercronic/releases/download/${SUPERCRONIC_VERSION}/${SUPERCRONIC} \
+    && curl -fsSLO "$SUPERCRONIC_URL" \
+    && echo "${SUPERCRONIC_SHA256SUM}  ${SUPERCRONIC}" | sha256sum --check - \
+    && chmod +x "$SUPERCRONIC" \
+    && mv "$SUPERCRONIC" "/usr/local/bin/${SUPERCRONIC}" \
+    && ln -s "/usr/local/bin/${SUPERCRONIC}" /usr/local/bin/supercronic
+
+# uv image label "0.12.5"
+COPY --from=ghcr.io/astral-sh/uv@sha256:e85be844203885286c60ffad8a858d48afb6c5a5c237ca0e67f12e74b8f174b1 /uv /uvx /bin/
+
+ARG UVCACHE=/root/.cache/uv
+WORKDIR /app
+
+COPY monitoring/monitor.py monitoring/monitor.py.lock /app/
+RUN uv lock --check --script monitor.py
+
+RUN --mount=type=cache,target=${UVCACHE} uv export --script monitor.py --locked | uv pip install --system -r -
+
+COPY monitoring/entrypoint.sh /app/entrypoint.sh
+RUN chmod +x /app/entrypoint.sh
+
+ENTRYPOINT ["/app/entrypoint.sh"]
diff --git a/monitoring/entrypoint.sh b/monitoring/entrypoint.sh
new file mode 100755
index 0000000..9dca28b
--- /dev/null
+++ b/monitoring/entrypoint.sh
@@ -0,0 +1,14 @@
+#!/bin/bash
+
+set -eo pipefail
+
+if [ -z "$MONITORING_CRON_SCHEDULE" ]; then
+  echo "You must set MONITORING_CRON_SCHEDULE when running this container"
+  exit 1
+fi
+
+cat > /etc/crontab <<EOF
+$MONITORING_CRON_SCHEDULE python /app/monitor.py
+EOF
+
+exec supercronic /etc/crontab
diff --git a/monitoring/monitor.py b/monitoring/monitor.py
new file mode 100644
index 0000000..76e91f8
--- /dev/null
+++ b/monitoring/monitor.py
@@ -0,0 +1,197 @@
+#!/usr/bin/env python3
+"""Scan saved HL7 messages and emit OpenTelemetry metrics.
+
+Run in this command in dev to update the lockfile: `uv lock --script monitoring/monitor.py`
+"""
+
+import logging
+import os
+import sys
+import time
+from pathlib import Path
+from time import perf_counter
+
+from opentelemetry.metrics import Meter
+from opentelemetry import metrics
+from opentelemetry.exporter.otlp.proto.http.metric_exporter import (
+    OTLPMetricExporter,
+)
+from opentelemetry.sdk.metrics import MeterProvider
+from opentelemetry.sdk.metrics.export import PeriodicExportingMetricReader
+from opentelemetry.sdk.resources import SERVICE_NAME, Resource
+
+# /// script
+# requires-python = ">=3.13"
+# dependencies = [
+#   "opentelemetry-exporter-otlp-proto-http==1.42.0",
+# ]
+# ///
+
+INSTRUMENTATION_SCOPE = "waveform-monitoring.meter"
+SAVED_MESSAGES_DIR = Path("/waveform-saved-messages")
+WAVEFORM_EXPORT_DIR = Path("/waveform-export")
+
+logging.basicConfig(
+    level=logging.INFO,
+    format="%(asctime)s %(levelname)s %(message)s",
+    stream=sys.stdout,
+)
+logger = logging.getLogger(__name__)
+
+
+def _env(name: str, default: str | None = None) -> str:
+    value = os.environ.get(name)
+    if value is None or value == "":
+        if default is not None:
+            return default
+        else:
+            raise RuntimeError(f"Environment variable {name} not set")
+    return value
+
+
+def _scan_directory_ages(path: Path) -> tuple[int, float | None, float | None]:
+    """Return file count, newest age (seconds), oldest age (seconds)."""
+    now = time.time()
+    mtimes: list[float] = []
+
+    for entry in path.rglob("*.hl7archive.bz2"):
+        if entry.is_file():
+            mtimes.append(entry.stat().st_mtime)
+
+    if not mtimes:
+        return 0, None, None
+
+    newest_mtime = max(mtimes)
+    oldest_mtime = min(mtimes)
+    return len(mtimes), now - newest_mtime, now - oldest_mtime
+
+
+def _setup_metrics(service_name: str, otlp_endpoint: str | None) -> None:
+    if not otlp_endpoint:
+        logger.error(
+            "OTEL_EXPORTER_OTLP_ENDPOINT not set; metrics will not be exported"
+        )
+        return
+
+    metrics.set_meter_provider(
+        MeterProvider(
+            resource=Resource.create({SERVICE_NAME: service_name}),
+            metric_readers=[
+                PeriodicExportingMetricReader(
+                    OTLPMetricExporter(), export_interval_millis=15000
+                )
+            ],
+        )
+    )
+
+
+def scan_hl7_bz2(meter: Meter):
+    file_count = meter.create_up_down_counter(
+        "waveform.monitoring.hl7bz2_files.count",
+        unit="{file}",
+        description="Total HL7 files in saved-messages directory",
+    )
+    newest_age = meter.create_gauge(
+        "waveform.monitoring.hl7bz2_files.newest_age_seconds",
+        unit="s",
+        description="Age of the most recently modified HL7 file",
+    )
+    oldest_age = meter.create_gauge(
+        "waveform.monitoring.hl7bz2_files.oldest_age_seconds",
+        unit="s",
+        description="Age of the oldest HL7 file",
+    )
+    total_bytes = meter.create_gauge(
+        "waveform.monitoring.hl7bz2_files.total_bytes",
+        unit="By",
+        description="Total byte count of hl7 bz2 files",
+    )
+
+    scan_time_hist = meter.create_histogram(
+        "waveform.monitoring.hl7bz2_files.meta.disk_scan_time",
+        unit="s",
+        description="Duration of disk scan for metrics generation",
+    )
+
+    start_time = perf_counter()
+    byte_count = _bytes_in_regular_files(SAVED_MESSAGES_DIR)
+    total_bytes.set(byte_count)
+    count, newest_age_seconds, oldest_age_seconds = _scan_directory_ages(
+        SAVED_MESSAGES_DIR
+    )
+    time_taken = perf_counter() - start_time
+    scan_time_hist.record(time_taken)
+    file_count.add(count)
+    if newest_age_seconds is not None:
+        newest_age.set(newest_age_seconds)
+    if oldest_age_seconds is not None:
+        oldest_age.set(oldest_age_seconds)
+    logger.info(
+        "Scanned %s in %ss: count=%d newest_age=%s oldest_age=%s, bytes=%s",
+        SAVED_MESSAGES_DIR,
+        time_taken,
+        count,
+        f"{newest_age_seconds:.0f}s" if newest_age_seconds is not None else "n/a",
+        f"{oldest_age_seconds:.0f}s" if oldest_age_seconds is not None else "n/a",
+        byte_count,
+    )
+
+
+def scan_waveform_exporter_files(meter):
+    scan_time_hist = meter.create_histogram(
+        "waveform.monitoring.exporter.meta.disk_scan_time",
+        unit="s",
+        description="Duration of disk scan for metrics generation",
+    )
+    start_time = perf_counter()
+    # dirs that contain large files where we need to track disk usage
+    big_top_level_dirs = ["original-csv", "original-parquet", "pseudonymised"]
+    # dirs that won't get too large but do have other info we'll want to track
+    for tld_name in big_top_level_dirs:
+        tld = WAVEFORM_EXPORT_DIR / tld_name
+        tld_meter_name = tld_name.replace("-", "_")
+        gauge = meter.create_gauge(
+            f"waveform.monitoring.{tld_meter_name}_bytes",
+            unit="By",
+            description=f"Bytes in the {tld_name} directory",
+        )
+        byte_count = _bytes_in_regular_files(tld)
+        gauge.set(byte_count)
+    time_taken = perf_counter() - start_time
+    scan_time_hist.record(time_taken)
+    logger.info("Scanned %s in %ss", WAVEFORM_EXPORT_DIR, time_taken)
+
+
+def _bytes_in_regular_files(tld: Path):
+    """Get sum of bytes in all regular files under the given directory."""
+    byte_count = 0
+    for dn, _, files in tld.walk():
+        for f in files:
+            f_path = dn / f
+            if f_path.is_file():
+                byte_count += f_path.stat().st_size
+    return byte_count
+
+
+def main() -> int:
+    service_name = _env("OTEL_SERVICE_NAME")
+    otlp_endpoint = _env("OTEL_EXPORTER_OTLP_ENDPOINT")
+
+    # setup
+    _setup_metrics(service_name, otlp_endpoint)
+    meter = metrics.get_meter(INSTRUMENTATION_SCOPE)
+
+    # things to measure
+    scan_hl7_bz2(meter)
+    scan_waveform_exporter_files(meter)
+
+    # shutdown, flush data
+    provider = metrics.get_meter_provider()
+    if isinstance(provider, MeterProvider):
+        provider.force_flush(timeout_millis=15000)
+
+    return 0
+
+
+if __name__ == "__main__":
+    raise SystemExit(main())
diff --git a/monitoring/monitor.py.lock b/monitoring/monitor.py.lock
new file mode 100644
index 0000000..0303a54
--- /dev/null
+++ b/monitoring/monitor.py.lock
@@ -0,0 +1,280 @@
+version = 1
+revision = 3
+requires-python = ">=3.13"
+
+[manifest]
+requirements = [{ name = "opentelemetry-exporter-otlp-proto-http", specifier = "==1.42.0" }]
+
+[[package]]
+name = "certifi"
+version = "2026.7.22"
+source = { registry = "https://pypi.org/simple" }
+sdist = { url = "https://files.pythonhosted.org/packages/a3/c2/24167ea9858356b47a87a50d39908bfdb72ceeefe0041586e704e5376b3a/certifi-2026.7.22.tar.gz", hash = "sha256:741e2c3b351ddf169a738da9f2c048608ff7f2c5cc02f1ebc6b118bb090d5d55", size = 138112, upload-time = "2026-07-22T03:35:12.644Z" }
+wheels = [
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+]
+
+[[package]]
+name = "charset-normalizer"
+version = "3.5.1"
+source = { registry = "https://pypi.org/simple" }
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diff --git a/pyproject.toml b/pyproject.toml
index f1146c3..ab7060e 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -10,6 +10,8 @@ dependencies = [
     "pika>=1.3.2",
     "pre-commit>=4.5.0",
     "snakemake==9.14.5",
+    "opentelemetry-distro==0.63b1",
+    "opentelemetry-exporter-otlp-proto-http==1.42.0",
     # need to be compatible with PIXL, which currently pins 2.9.10 (arguably it shouldn't)
     "psycopg2-binary>=2.9.10",
     "requests==2.32.4",
@@ -64,3 +66,5 @@ omit = ["**/Snakefile"]
 
 [tool.mypy]
 ignore_missing_imports = true
+# opentelemetry docs recommend this
+namespace_packages = true
diff --git a/src/controller.py b/src/controller.py
index 8a9f1e2..c5c84fc 100644
--- a/src/controller.py
+++ b/src/controller.py
@@ -3,13 +3,19 @@
 based on https://www.rabbitmq.com/tutorials/tutorial-one-python
 """
 
+from dataclasses import dataclass
 from datetime import datetime, timezone
 import logging
+from typing import Literal, Any, Optional
 
 import pika
+from pika import spec
+from pika.adapters.blocking_connection import BlockingChannel
+
 import db as db  # type:ignore
 import settings as settings  # type:ignore
 import csv_writer as writer  # type:ignore
+import telemetry as telemetry  # type:ignore
 from emap_interchange.messages import (
     WaveformBaseMessage,
     WaveformHighFreqMessage,
@@ -45,20 +51,107 @@ def reject_message(ch, delivery_tag, requeue):
         logger.warning("Attempting to not acknowledge a message on a closed channel.")
 
 
+ActionType = Literal["ack", "reject"]
+RejectReasonType = Literal[
+    "wrong_type",
+    "missing_key",
+    "numeric_string_confusion",
+    "db_conn_err",
+    "opt_out",
+    "no_ehr_lookup",
+]
+
+
+@dataclass(frozen=True)
+class MessageOutcome:
+    ch: BlockingChannel
+    delivery_tag: Any
+    action: ActionType
+    requeue: bool = False
+    reason: str | None = None
+    # success-only:
+    success_attrs: dict | None = None
+    num_data_points: int = 0
+
+
+def finalise_message(outcome: MessageOutcome):
+    """Send the ack/reject to rabbitmq, and send the appropriate telemetry to Otel.
+
+    We have a counter for ALL messages and their outcomes, and then more detailed
+    counters for successful messages.
+    """
+    handled_attrs: dict[str, Any] = {}
+    if outcome.action == "ack":
+        ack_message(outcome.ch, outcome.delivery_tag)
+        telemetry.messages_processed.add(1, outcome.success_attrs)
+        telemetry.data_points_processed.add(
+            outcome.num_data_points, outcome.success_attrs
+        )
+        # Don't use a word that implies success, because "rejected" is not always an error
+        handled_attrs["waveform.disposition"] = "processed"
+    elif outcome.action == "reject":
+        reject_message(outcome.ch, outcome.delivery_tag, requeue=outcome.requeue)
+        handled_attrs["waveform.disposition"] = (
+            "requeued" if outcome.requeue else "rejected"
+        )
+        handled_attrs["waveform.reject.reason"] = outcome.reason
+
+        # opt-out is NOT an error, but does lead to rejection
+        non_error_reasons: list[RejectReasonType] = ["opt_out"]
+        if outcome.reason not in non_error_reasons:
+            # Specifically use this attr name because it's an OTel convention
+            # for error types https://opentelemetry.io/docs/specs/semconv/registry/attributes/error/
+            handled_attrs["error.type"] = outcome.reason
+    telemetry.messages_handled.add(1, handled_attrs)
+
+
 class WaveformController:
     def __init__(self):
         self.emap_db = db.starDB()
         self.emap_db.init_query()
         self.emap_db.connect()
 
-    def waveform_callback(self, ch, method_frame, _header_frame, body):
+    def waveform_callback(
+        self,
+        ch: BlockingChannel,
+        method_frame: spec.Basic.Deliver,
+        _header_frame: spec.BasicProperties,
+        body: bytes,
+    ):
+        outcome = self._process_message(ch, method_frame, _header_frame, body)
+        finalise_message(outcome)
+
+    def _process_message(
+        self,
+        ch: BlockingChannel,
+        method_frame: spec.Basic.Deliver,
+        _header_frame: spec.BasicProperties,
+        body: bytes,
+    ) -> MessageOutcome:
+        def outcome(
+            action: ActionType,
+            *,
+            reason: Optional[RejectReasonType] = None,
+            requeue: bool = False,
+            success_attrs=None,
+            num_data_points=0,
+        ) -> MessageOutcome:
+            return MessageOutcome(
+                ch,
+                method_frame.delivery_tag,
+                action,
+                reason=reason,
+                requeue=requeue,
+                success_attrs=success_attrs,
+                num_data_points=num_data_points,
+            )
+
         logger.debug("Message received of length %s", len(body))
         try:
             message = WaveformBaseMessage.from_json(body)
         except TypeError as e:
             logger.error("Skipping, could not understand message type %s", e)
-            reject_message(ch, method_frame.delivery_tag, False)
-            return
+            return outcome("reject", reason="wrong_type", requeue=False)
 
         try:
             location_string = message.get_mapped_location_string()
@@ -101,18 +194,16 @@ def waveform_callback(self, ch, method_frame, _header_frame, body):
                     "Unrecognized message type but should have dealt with this by now?"
                 )
         except KeyError as e:
-            reject_message(ch, method_frame.delivery_tag, False)
             logger.error(
                 f"Waveform message {method_frame.delivery_tag} is missing required data {e}."
             )
-            return
+            return outcome("reject", reason="missing_key", requeue=False)
 
         if (numeric_values is None) == (string_values is None):
-            reject_message(ch, method_frame.delivery_tag, False)
             logger.error(
                 f"Waveform message {method_frame.delivery_tag} has either both numeric and string values, or neither."
             )
-            return
+            return outcome("reject", reason="numeric_string_confusion", requeue=False)
 
         observation_time = datetime.fromtimestamp(
             observation_timestamp, tz=timezone.utc
@@ -131,16 +222,14 @@ def waveform_callback(self, ch, method_frame, _header_frame, body):
             matched_mrn = ("unmatched_mrn", "unmatched_nhs", "unmatched_csn", False)
         except ConnectionError:
             logger.error("Database error, will try again", exc_info=True)
-            reject_message(ch, method_frame.delivery_tag, True)
-            return
+            return outcome("reject", reason="db_conn_err", requeue=True)
 
         (mrn, nhs_no, csn, opt_out) = matched_mrn
         if opt_out:
             logger.info("Research opt-out is set for mrn %s, not writing.", mrn)
-            reject_message(ch, method_frame.delivery_tag, False)
-            return
+            return outcome("reject", reason="opt_out", requeue=False)
 
-        if writer.write_frame(
+        writer.write_frame(
             source_variable_id=source_variable_id,
             source_channel_id=source_channel_id,
             sampling_rate=sampling_rate,
@@ -151,11 +240,23 @@ def waveform_callback(self, ch, method_frame, _header_frame, body):
             mrn=mrn,
             numeric_values=numeric_values,
             string_values=string_values,
-        ):
-            if lookup_success:
-                ack_message(ch, method_frame.delivery_tag)
+        )
+        if lookup_success:
+            success_attrs = {
+                # don't include CSNs until we're sure that would be acceptable
+                "mapped_location_string": mapped_location_string,
+                "source_variable_id": source_variable_id,
+                "message_type": str(type(message)),  # HF vs LF
+            }
+            if numeric_values is not None:
+                num_data_points = len(numeric_values)
             else:
-                reject_message(ch, method_frame.delivery_tag, False)
+                assert string_values is not None
+                num_data_points = len(string_values)
+            return outcome(
+                "ack", success_attrs=success_attrs, num_data_points=num_data_points
+            )
+        return outcome("reject", reason="no_ehr_lookup", requeue=False)
 
 
 def receiver():
diff --git a/src/csv_writer.py b/src/csv_writer.py
index 3c27c13..a762273 100644
--- a/src/csv_writer.py
+++ b/src/csv_writer.py
@@ -43,11 +43,11 @@ def write_frame(
     mapped_location_string: str,
     csn: str,
     mrn: str,
-) -> bool:
+) -> None:
     """Appends a frame of waveform data to a csv file (creates file if it doesn't
-    exist). Exactly ONE of string_values, numeric_values must contain a non-None value.
+    exist).
 
-    :return: True if write was successful.
+    Exactly ONE of string_values, numeric_values must contain a non-None value.
     """
     num_non_nones = sum(1 for x in (string_values, numeric_values) if x is not None)
     if num_non_nones != 1:
@@ -93,5 +93,3 @@ def write_frame(
         ]
 
         wv_writer.writerow(row_array)
-
-    return True
diff --git a/src/pipeline/Snakefile b/src/pipeline/Snakefile
index dbce7db..97965a4 100644
--- a/src/pipeline/Snakefile
+++ b/src/pipeline/Snakefile
@@ -18,7 +18,7 @@ from locations import (
 )
 from pseudon.pseudon import csv_to_parquets
 
-from utils import config_bool, determine_eventual_outputs
+from utils import config_bool, determine_eventual_outputs, report_ftp_upload
 
 
 # How long before we assume that no more data will be written to the file, and
@@ -151,6 +151,7 @@ rule send_ftps:
         logger = configure_file_logging(log[0])
         logger.info("Calling do_upload to upload file %s", input[0])
         do_upload(Path(input[0]))
+        report_ftp_upload()
         end_perf = time.perf_counter()
         end_timestamp = datetime.now(timezone.utc).isoformat()
         # now that we have success, create the sentinel file
diff --git a/src/pipeline/utils.py b/src/pipeline/utils.py
index 6bf58b4..7560b82 100644
--- a/src/pipeline/utils.py
+++ b/src/pipeline/utils.py
@@ -1,4 +1,5 @@
 import time
+import telemetry
 from datetime import datetime, timedelta, timezone
 from pathlib import Path
 import re
@@ -131,3 +132,7 @@ def determine_eventual_outputs(
         f"Calculated output files using newness threshold {csv_wait_time} in {after - before} seconds"
     )
     return _all_outputs, _hash_to_csn
+
+
+def report_ftp_upload():
+    telemetry.ftps_uploaded.add(1)
diff --git a/src/settings.py b/src/settings.py
index 3bccd12..75f6908 100644
--- a/src/settings.py
+++ b/src/settings.py
@@ -40,3 +40,7 @@ def get_from_env(env_var, *, default_value=None, setting_name=None, required=Fal
 get_from_env("LOG_LEVEL", default_value="INFO")
 
 get_from_env("INSTANCE_NAME", required=True)
+
+# OpenTelemetry: OTLP/HTTP base URL of the LGTM collector, e.g. http://lgtm:4318
+get_from_env("OTEL_EXPORTER_OTLP_ENDPOINT")
+get_from_env("OTEL_SERVICE_NAME", default_value="waveform-misc")
diff --git a/src/telemetry.py b/src/telemetry.py
new file mode 100644
index 0000000..f0e5821
--- /dev/null
+++ b/src/telemetry.py
@@ -0,0 +1,55 @@
+"""Minimal OpenTelemetry metrics: in-process counters, periodic OTLP export."""
+
+from opentelemetry import metrics
+from opentelemetry.exporter.otlp.proto.http.metric_exporter import (
+    OTLPMetricExporter,
+)
+from opentelemetry.sdk.metrics import MeterProvider
+from opentelemetry.sdk.metrics.export import PeriodicExportingMetricReader
+from opentelemetry.sdk.resources import SERVICE_NAME, Resource
+
+import settings as settings  # type: ignore
+
+# Instrumentation scope: to distinguish instruments
+# as ours, as opposed to a library
+# (pika, psycopg2, ...).
+#
+# Distinct from OTEL_SERVICE_NAME, which is the
+# process/deployment identity.
+INSTRUMENTATION_SCOPE = "waveform-controller.meter"
+
+if settings.OTEL_EXPORTER_OTLP_ENDPOINT:
+    metrics.set_meter_provider(
+        MeterProvider(
+            resource=Resource.create({SERVICE_NAME: settings.OTEL_SERVICE_NAME}),
+            metric_readers=[
+                PeriodicExportingMetricReader(
+                    OTLPMetricExporter(), export_interval_millis=15000
+                )
+            ],
+        )
+    )
+
+messages_processed = metrics.get_meter(INSTRUMENTATION_SCOPE).create_counter(
+    "waveform.messages.processed",
+    unit="{message}",
+    description="Waveform queue messages successfully written",
+)
+
+messages_handled = metrics.get_meter(INSTRUMENTATION_SCOPE).create_counter(
+    "waveform.messages.handled",
+    unit="{message}",
+    description="Waveform queue messages handled (ack or reject)",
+)
+
+data_points_processed = metrics.get_meter(INSTRUMENTATION_SCOPE).create_counter(
+    "waveform.data_points.processed",
+    unit="{data_point}",
+    description="Waveform data points processed successfully",
+)
+
+ftps_uploaded = metrics.get_meter(INSTRUMENTATION_SCOPE).create_counter(
+    "waveform.ftps.uploaded",
+    unit="{file}",
+    description="Waveform ftps parquet file uploaded",
+)
diff --git a/tests/test_controller.py b/tests/test_controller.py
index b2585f1..092b356 100644
--- a/tests/test_controller.py
+++ b/tests/test_controller.py
@@ -176,7 +176,7 @@ def test_controller_callback(
         emap_db_mock.get_row.return_value = ("mrn", "nhsno", "csn", opt_out)
     monkeypatch.setattr("controller.db.starDB", Mock(return_value=emap_db_mock))
 
-    write_frame_mock = Mock(return_value=True)
+    write_frame_mock = Mock()
     monkeypatch.setattr("controller.writer.write_frame", write_frame_mock)
 
     # Simulate various kinds of bad data. Make sure to keep the range parameter
diff --git a/tests/test_snakemake_integration.py b/tests/test_snakemake_integration.py
index 31b5409..6fbc866 100644
--- a/tests/test_snakemake_integration.py
+++ b/tests/test_snakemake_integration.py
@@ -331,7 +331,8 @@ def _assert_date_partitioned_files(
 
 
 def _collect_docker_coverage(coverage_dir: Path) -> None:
-    """Copy in-container coverage data next to pytest-cov's files for session combine."""
+    """Copy in-container coverage data next to pytest-cov's files for session
+    combine."""
     # Replace any previous docker shards so a later `coverage combine` cannot
     # mix stale runs.
     for stale in REPO_ROOT.glob(".coverage.docker.*"):
diff --git a/uv.lock b/uv.lock
index b681b20..a93d6dd 100644
--- a/uv.lock
+++ b/uv.lock
@@ -712,6 +712,18 @@ wheels = [
     { url = "https://files.pythonhosted.org/packages/01/61/d4b89fec821f72385526e1b9d9a3a0385dda4a72b206d28049e2c7cd39b8/gitpython-3.1.45-py3-none-any.whl", hash = "sha256:8908cb2e02fb3b93b7eb0f2827125cb699869470432cc885f019b8fd0fccff77", size = 208168, upload-time = "2025-07-24T03:45:52.517Z" },
 ]
 
+[[package]]
+name = "googleapis-common-protos"
+version = "1.75.1"
+source = { registry = "https://pypi.org/simple" }
+dependencies = [
+    { name = "protobuf" },
+]
+sdist = { url = "https://files.pythonhosted.org/packages/72/73/74bcab964c9a7a61f2bb71e8179b0f13e6fa98f7ce00fd168aab291e4a2e/googleapis_common_protos-1.75.1.tar.gz", hash = "sha256:d3042c6c5a2d4e67113104d6b6818b59b6bd92a197f2a91508e801fe815cf071", size = 150967, upload-time = "2026-08-06T06:24:51.972Z" }
+wheels = [
+    { url = "https://files.pythonhosted.org/packages/9a/51/186c02b8549b69ccda44429cf6ff5081e4b61a602ddfe6a8020d1be31d1b/googleapis_common_protos-1.75.1-py3-none-any.whl", hash = "sha256:28a1934bcd33b9c9da66ac301a0a4227e3367f095a17d0375cb98f0a09d93b79", size = 300626, upload-time = "2026-08-06T06:23:46.696Z" },
+]
+
 [[package]]
 name = "greenlet"
 version = "3.3.0"
@@ -1242,6 +1254,116 @@ wheels = [
     { url = "https://files.pythonhosted.org/packages/2d/ee/346fa473e666fe14c52fcdd19ec2424157290a032d4c41f98127bfb31ac7/numpy-2.3.5-pp311-pypy311_pp73-win_amd64.whl", hash = "sha256:f16417ec91f12f814b10bafe79ef77e70113a2f5f7018640e7425ff979253425", size = 12967213, upload-time = "2025-11-16T22:52:39.38Z" },
 ]
 
+[[package]]
+name = "opentelemetry-api"
+version = "1.42.1"
+source = { registry = "https://pypi.org/simple" }
+dependencies = [
+    { name = "typing-extensions" },
+]
+sdist = { url = "https://files.pythonhosted.org/packages/b4/1c/125e1c936c0873796771b7f04f6c93b9f1bf5d424cea90fda94a99f61da8/opentelemetry_api-1.42.1.tar.gz", hash = "sha256:56c63bea9f77b62856be8c47600474acad853b2924b99b1687c4cb6297166716", size = 72296, upload-time = "2026-05-21T16:32:49.335Z" }
+wheels = [
+    { url = "https://files.pythonhosted.org/packages/a3/ca/9520cc1f3dfbbd03ac5903bbf55833e257bc64b1cf30fa8b0d6df374d821/opentelemetry_api-1.42.1-py3-none-any.whl", hash = "sha256:51a69edacadbc03a8950ace1c4c21099cacc538820ac2c9e36277e78cebba714", size = 61311, upload-time = "2026-05-21T16:32:28.822Z" },
+]
+
+[[package]]
+name = "opentelemetry-distro"
+version = "0.63b1"
+source = { registry = "https://pypi.org/simple" }
+dependencies = [
+    { name = "opentelemetry-api" },
+    { name = "opentelemetry-instrumentation" },
+    { name = "opentelemetry-sdk" },
+]
+sdist = { url = "https://files.pythonhosted.org/packages/c5/97/87080029d9309841dd97db34130f9410cda77162843f81d09ad257dce1ef/opentelemetry_distro-0.63b1.tar.gz", hash = "sha256:f435098abc7953f58226e8bf79e4c90bc6b32e50aa75d6fa074201db8243b577", size = 2333, upload-time = "2026-05-21T16:36:11.285Z" }
+wheels = [
+    { url = "https://files.pythonhosted.org/packages/35/97/16619e2e0e5192f2d1b8da2aaaefface05463cc1cfca6b81d3a3108ccedd/opentelemetry_distro-0.63b1-py3-none-any.whl", hash = "sha256:b405b04ad70e430390265eb38e82e067a84ca1f49a21429eaadb930c13330d66", size = 2777, upload-time = "2026-05-21T16:34:51.441Z" },
+]
+
+[[package]]
+name = "opentelemetry-exporter-otlp-proto-common"
+version = "1.42.0"
+source = { registry = "https://pypi.org/simple" }
+dependencies = [
+    { name = "opentelemetry-proto" },
+]
+sdist = { url = "https://files.pythonhosted.org/packages/76/a9/1496f27ecdfc7d504eac80f5e16474ee9d47cd08cda1f2917b58cf1c299c/opentelemetry_exporter_otlp_proto_common-1.42.0.tar.gz", hash = "sha256:c7a1a61f3a4c4dfa83127353edb1c75b873289d9ee42379db46eb835963b72e3", size = 21430, upload-time = "2026-05-19T09:46:32.838Z" }
+wheels = [
+    { url = "https://files.pythonhosted.org/packages/8b/7b/1542eb6e3d941a7dd93648d485b7c8495bc2841a2bb7dd5f394f370cf607/opentelemetry_exporter_otlp_proto_common-1.42.0-py3-none-any.whl", hash = "sha256:92de67f096c9200770f16fbdb63b96fb6061d604b4bc266726d8355caeb864e8", size = 17328, upload-time = "2026-05-19T09:46:11.291Z" },
+]
+
+[[package]]
+name = "opentelemetry-exporter-otlp-proto-http"
+version = "1.42.0"
+source = { registry = "https://pypi.org/simple" }
+dependencies = [
+    { name = "googleapis-common-protos" },
+    { name = "opentelemetry-api" },
+    { name = "opentelemetry-exporter-otlp-proto-common" },
+    { name = "opentelemetry-proto" },
+    { name = "opentelemetry-sdk" },
+    { name = "requests" },
+    { name = "typing-extensions" },
+]
+sdist = { url = "https://files.pythonhosted.org/packages/8a/da/be1a80ca82f155e6067213243f5bae5c10985d3c7603eadaf8c750ebe9eb/opentelemetry_exporter_otlp_proto_http-1.42.0.tar.gz", hash = "sha256:640013aacdbbe01bfb187c66dd331b24249517b7f36c0cd994ef75544d1dbd0b", size = 25405, upload-time = "2026-05-19T09:46:34.356Z" }
+wheels = [
+    { url = "https://files.pythonhosted.org/packages/97/df/a5b8df72a4ef59519170d6f5fc4bd06528fed42e593b9b16b027cb477e50/opentelemetry_exporter_otlp_proto_http-1.42.0-py3-none-any.whl", hash = "sha256:f2cb9ea5dfac29e91b7b04034ca5a4bfae14b51cb334172c5b42b86a48843324", size = 21792, upload-time = "2026-05-19T09:46:13.67Z" },
+]
+
+[[package]]
+name = "opentelemetry-instrumentation"
+version = "0.63b1"
+source = { registry = "https://pypi.org/simple" }
+dependencies = [
+    { name = "opentelemetry-api" },
+    { name = "opentelemetry-semantic-conventions" },
+    { name = "packaging" },
+    { name = "wrapt" },
+]
+sdist = { url = "https://files.pythonhosted.org/packages/da/6d/4de72d97ff54db1ed270c7a59c9b904b917c0ac7af429c086c388b824ddb/opentelemetry_instrumentation-0.63b1.tar.gz", hash = "sha256:32368d6ae52c8de20aa790a6ad86b10a76f09956092337ae37d675773990e541", size = 41081, upload-time = "2026-05-21T16:36:14.206Z" }
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+]
+
+[[package]]
+name = "opentelemetry-proto"
+version = "1.42.0"
+source = { registry = "https://pypi.org/simple" }
+dependencies = [
+    { name = "protobuf" },
+]
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+wheels = [
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+]
+
+[[package]]
+name = "opentelemetry-sdk"
+version = "1.42.1"
+source = { registry = "https://pypi.org/simple" }
+dependencies = [
+    { name = "opentelemetry-api" },
+    { name = "opentelemetry-semantic-conventions" },
+    { name = "typing-extensions" },
+]
+sdist = { url = "https://files.pythonhosted.org/packages/40/f7/b390bd9bfd703bf98a68fea1f27786c6872331fd617164a54b8a59bdc008/opentelemetry_sdk-1.42.1.tar.gz", hash = "sha256:8c834e8f8c9ba4171d4ec843d0cb8a67e4c7394d3f9e9297e582cbd9456ddbf7", size = 239262, upload-time = "2026-05-21T16:33:04.641Z" }
+wheels = [
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+]
+
+[[package]]
+name = "opentelemetry-semantic-conventions"
+version = "0.63b1"
+source = { registry = "https://pypi.org/simple" }
+dependencies = [
+    { name = "opentelemetry-api" },
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 version = "7.1.3"
@@ -2322,6 +2459,8 @@ version = "0.1.0"
 source = { virtual = "." }
 dependencies = [
     { name = "core" },
+    { name = "opentelemetry-distro" },
+    { name = "opentelemetry-exporter-otlp-proto-http" },
     { name = "pandas" },
     { name = "pika" },
     { name = "pre-commit" },
@@ -2346,6 +2485,8 @@ dev = [
 requires-dist = [
     { name = "core", directory = "../PIXL/pixl_core" },
     { name = "coverage", marker = "extra == 'coverage'", specifier = ">=7.0" },
+    { name = "opentelemetry-distro", specifier = "==0.63b1" },
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