diff --git a/README.md b/README.md
index df94ffa..a888f63 100644
--- a/README.md
+++ b/README.md
@@ -93,6 +93,16 @@ services:
       LOG_LEVEL: "info"
 ```
 
+## Prometheus exporter
+
+Set the `PROMETHEUS_PORT` env to enable an http server with [Prometheus](https://prometheus.io/) endpoint at `/metrics`, for example
+
+```
+PROMETHEUS_PORT=8080
+```
+
+Combined with `SINGLE_SHOT` this instead writes a sample to a tmp file and prints the path.
+
 ## ToDo
 
 - **Integration into Nightscout**: I have not yet looked into the plugin architecture of Nightscout. Maybe this should
diff --git a/package-lock.json b/package-lock.json
index 96d2118..d770bd9 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,21 +1,24 @@
 {
   "name": "nightscout-librelink-up",
-  "version": "2.0.1",
+  "version": "2.1.0",
   "lockfileVersion": 2,
   "requires": true,
   "packages": {
     "": {
       "name": "nightscout-librelink-up",
-      "version": "2.0.1",
+      "version": "2.1.0",
       "license": "MIT",
       "dependencies": {
         "axios": "^1.2.2",
         "axios-mock-adapter": "^1.21.2",
+        "express": "4.18.2",
         "node-cron": "3.0.2",
+        "prom-client": "14.2.0",
         "winston": "^3.8.2"
       },
       "devDependencies": {
         "@tsconfig/node18": "^1.0.1",
+        "@types/express": "4.17.17",
         "@types/jest": "^29.2.4",
         "@types/node": "^18.11.18",
         "@types/node-cron": "^3.0.7",
@@ -1334,6 +1337,48 @@
         "@babel/types": "^7.3.0"
       }
     },
+    "node_modules/@types/body-parser": {
+      "version": "1.19.2",
+      "resolved": "https://registry.npmjs.org/@types/body-parser/-/body-parser-1.19.2.tgz",
+      "integrity": "sha512-ALYone6pm6QmwZoAgeyNksccT9Q4AWZQ6PvfwR37GT6r6FWUPguq6sUmNGSMV2Wr761oQoBxwGGa6DR5o1DC9g==",
+      "dev": true,
+      "dependencies": {
+        "@types/connect": "*",
+        "@types/node": "*"
+      }
+    },
+    "node_modules/@types/connect": {
+      "version": "3.4.35",
+      "resolved": "https://registry.npmjs.org/@types/connect/-/connect-3.4.35.tgz",
+      "integrity": "sha512-cdeYyv4KWoEgpBISTxWvqYsVy444DOqehiF3fM3ne10AmJ62RSyNkUnxMJXHQWRQQX2eR94m5y1IZyDwBjV9FQ==",
+      "dev": true,
+      "dependencies": {
+        "@types/node": "*"
+      }
+    },
+    "node_modules/@types/express": {
+      "version": "4.17.17",
+      "resolved": "https://registry.npmjs.org/@types/express/-/express-4.17.17.tgz",
+      "integrity": "sha512-Q4FmmuLGBG58btUnfS1c1r/NQdlp3DMfGDGig8WhfpA2YRUtEkxAjkZb0yvplJGYdF1fsQ81iMDcH24sSCNC/Q==",
+      "dev": true,
+      "dependencies": {
+        "@types/body-parser": "*",
+        "@types/express-serve-static-core": "^4.17.33",
+        "@types/qs": "*",
+        "@types/serve-static": "*"
+      }
+    },
+    "node_modules/@types/express-serve-static-core": {
+      "version": "4.17.33",
+      "resolved": "https://registry.npmjs.org/@types/express-serve-static-core/-/express-serve-static-core-4.17.33.tgz",
+      "integrity": "sha512-TPBqmR/HRYI3eC2E5hmiivIzv+bidAfXofM+sbonAGvyDhySGw9/PQZFt2BLOrjUUR++4eJVpx6KnLQK1Fk9tA==",
+      "dev": true,
+      "dependencies": {
+        "@types/node": "*",
+        "@types/qs": "*",
+        "@types/range-parser": "*"
+      }
+    },
     "node_modules/@types/graceful-fs": {
       "version": "4.1.5",
       "resolved": "https://registry.npmjs.org/@types/graceful-fs/-/graceful-fs-4.1.5.tgz",
@@ -1383,6 +1428,12 @@
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       "dev": true
     },
+    "node_modules/@types/mime": {
+      "version": "3.0.1",
+      "resolved": "https://registry.npmjs.org/@types/mime/-/mime-3.0.1.tgz",
+      "integrity": "sha512-Y4XFY5VJAuw0FgAqPNd6NNoV44jbq9Bz2L7Rh/J6jLTiHBSBJa9fxqQIvkIld4GsoDOcCbvzOUAbLPsSKKg+uA==",
+      "dev": true
+    },
     "node_modules/@types/node": {
       "version": "18.11.18",
       "resolved": "https://registry.npmjs.org/@types/node/-/node-18.11.18.tgz",
@@ -1401,12 +1452,34 @@
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       "dev": true
     },
+    "node_modules/@types/qs": {
+      "version": "6.9.7",
+      "resolved": "https://registry.npmjs.org/@types/qs/-/qs-6.9.7.tgz",
+      "integrity": "sha512-FGa1F62FT09qcrueBA6qYTrJPVDzah9a+493+o2PCXsesWHIn27G98TsSMs3WPNbZIEj4+VJf6saSFpvD+3Zsw==",
+      "dev": true
+    },
+    "node_modules/@types/range-parser": {
+      "version": "1.2.4",
+      "resolved": "https://registry.npmjs.org/@types/range-parser/-/range-parser-1.2.4.tgz",
+      "integrity": "sha512-EEhsLsD6UsDM1yFhAvy0Cjr6VwmpMWqFBCb9w07wVugF7w9nfajxLuVmngTIpgS6svCnm6Vaw+MZhoDCKnOfsw==",
+      "dev": true
+    },
     "node_modules/@types/semver": {
       "version": "7.3.13",
       "resolved": "https://registry.npmjs.org/@types/semver/-/semver-7.3.13.tgz",
       "integrity": "sha512-21cFJr9z3g5dW8B0CVI9g2O9beqaThGQ6ZFBqHfwhzLDKUxaqTIy3vnfah/UPkfOiF2pLq+tGz+W8RyCskuslw==",
       "dev": true
     },
+    "node_modules/@types/serve-static": {
+      "version": "1.15.1",
+      "resolved": "https://registry.npmjs.org/@types/serve-static/-/serve-static-1.15.1.tgz",
+      "integrity": "sha512-NUo5XNiAdULrJENtJXZZ3fHtfMolzZwczzBbnAeBbqBwG+LaG6YaJtuwzwGSQZ2wsCrxjEhNNjAkKigy3n8teQ==",
+      "dev": true,
+      "dependencies": {
+        "@types/mime": "*",
+        "@types/node": "*"
+      }
+    },
     "node_modules/@types/stack-utils": {
       "version": "2.0.1",
       "resolved": "https://registry.npmjs.org/@types/stack-utils/-/stack-utils-2.0.1.tgz",
@@ -1615,6 +1688,18 @@
         "url": "https://opencollective.com/typescript-eslint"
       }
     },
+    "node_modules/accepts": {
+      "version": "1.3.8",
+      "resolved": "https://registry.npmjs.org/accepts/-/accepts-1.3.8.tgz",
+      "integrity": "sha512-PYAthTa2m2VKxuvSD3DPC/Gy+U+sOA1LAuT8mkmRuvw+NACSaeXEQ+NHcVF7rONl6qcaxV3Uuemwawk+7+SJLw==",
+      "dependencies": {
+        "mime-types": "~2.1.34",
+        "negotiator": "0.6.3"
+      },
+      "engines": {
+        "node": ">= 0.6"
+      }
+    },
     "node_modules/acorn": {
       "version": "8.8.1",
       "resolved": "https://registry.npmjs.org/acorn/-/acorn-8.8.1.tgz",
@@ -1737,6 +1822,11 @@
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       "dev": true
     },
+    "node_modules/array-flatten": {
+      "version": "1.1.1",
+      "resolved": "https://registry.npmjs.org/array-flatten/-/array-flatten-1.1.1.tgz",
+      "integrity": "sha512-PCVAQswWemu6UdxsDFFX/+gVeYqKAod3D3UVm91jHwynguOwAvYPhx8nNlM++NqRcK6CxxpUafjmhIdKiHibqg=="
+    },
     "node_modules/array-union": {
       "version": "2.1.0",
       "resolved": "https://registry.npmjs.org/array-union/-/array-union-2.1.0.tgz",
@@ -1875,6 +1965,47 @@
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       "dev": true
     },
+    "node_modules/bintrees": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/bintrees/-/bintrees-1.0.2.tgz",
+      "integrity": "sha512-VOMgTMwjAaUG580SXn3LacVgjurrbMme7ZZNYGSSV7mmtY6QQRh0Eg3pwIcntQ77DErK1L0NxkbetjcoXzVwKw=="
+    },
+    "node_modules/body-parser": {
+      "version": "1.20.1",
+      "resolved": "https://registry.npmjs.org/body-parser/-/body-parser-1.20.1.tgz",
+      "integrity": "sha512-jWi7abTbYwajOytWCQc37VulmWiRae5RyTpaCyDcS5/lMdtwSz5lOpDE67srw/HYe35f1z3fDQw+3txg7gNtWw==",
+      "dependencies": {
+        "bytes": "3.1.2",
+        "content-type": "~1.0.4",
+        "debug": "2.6.9",
+        "depd": "2.0.0",
+        "destroy": "1.2.0",
+        "http-errors": "2.0.0",
+        "iconv-lite": "0.4.24",
+        "on-finished": "2.4.1",
+        "qs": "6.11.0",
+        "raw-body": "2.5.1",
+        "type-is": "~1.6.18",
+        "unpipe": "1.0.0"
+      },
+      "engines": {
+        "node": ">= 0.8",
+        "npm": "1.2.8000 || >= 1.4.16"
+      }
+    },
+    "node_modules/body-parser/node_modules/debug": {
+      "version": "2.6.9",
+      "resolved": "https://registry.npmjs.org/debug/-/debug-2.6.9.tgz",
+      "integrity": "sha512-bC7ElrdJaJnPbAP+1EotYvqZsb3ecl5wi6Bfi6BJTUcNowp6cvspg0jXznRTKDjm/E7AdgFBVeAPVMNcKGsHMA==",
+      "dependencies": {
+        "ms": "2.0.0"
+      }
+    },
+    "node_modules/body-parser/node_modules/ms": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/ms/-/ms-2.0.0.tgz",
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+    },
     "node_modules/brace-expansion": {
       "version": "1.1.11",
       "resolved": "https://registry.npmjs.org/brace-expansion/-/brace-expansion-1.1.11.tgz",
@@ -1952,6 +2083,26 @@
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       "dev": true
     },
+    "node_modules/bytes": {
+      "version": "3.1.2",
+      "resolved": "https://registry.npmjs.org/bytes/-/bytes-3.1.2.tgz",
+      "integrity": "sha512-/Nf7TyzTx6S3yRJObOAV7956r8cr2+Oj8AC5dt8wSP3BQAoeX58NoHyCU8P8zGkNXStjTSi6fzO6F0pBdcYbEg==",
+      "engines": {
+        "node": ">= 0.8"
+      }
+    },
+    "node_modules/call-bind": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/call-bind/-/call-bind-1.0.2.tgz",
+      "integrity": "sha512-7O+FbCihrB5WGbFYesctwmTKae6rOiIzmz1icreWJ+0aA7LJfuqhEso2T9ncpcFtzMQtzXf2QGGueWJGTYsqrA==",
+      "dependencies": {
+        "function-bind": "^1.1.1",
+        "get-intrinsic": "^1.0.2"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/ljharb"
+      }
+    },
     "node_modules/callsites": {
       "version": "3.1.0",
       "resolved": "https://registry.npmjs.org/callsites/-/callsites-3.1.0.tgz",
@@ -2130,12 +2281,44 @@
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       "dev": true
     },
+    "node_modules/content-disposition": {
+      "version": "0.5.4",
+      "resolved": "https://registry.npmjs.org/content-disposition/-/content-disposition-0.5.4.tgz",
+      "integrity": "sha512-FveZTNuGw04cxlAiWbzi6zTAL/lhehaWbTtgluJh4/E95DqMwTmha3KZN1aAWA8cFIhHzMZUvLevkw5Rqk+tSQ==",
+      "dependencies": {
+        "safe-buffer": "5.2.1"
+      },
+      "engines": {
+        "node": ">= 0.6"
+      }
+    },
+    "node_modules/content-type": {
+      "version": "1.0.5",
+      "resolved": "https://registry.npmjs.org/content-type/-/content-type-1.0.5.tgz",
+      "integrity": "sha512-nTjqfcBFEipKdXCv4YDQWCfmcLZKm81ldF0pAopTvyrFGVbcR6P/VAAd5G7N+0tTr8QqiU0tFadD6FK4NtJwOA==",
+      "engines": {
+        "node": ">= 0.6"
+      }
+    },
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       "version": "2.0.0",
       "resolved": "https://registry.npmjs.org/convert-source-map/-/convert-source-map-2.0.0.tgz",
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       "dev": true
     },
+    "node_modules/cookie": {
+      "version": "0.5.0",
+      "resolved": "https://registry.npmjs.org/cookie/-/cookie-0.5.0.tgz",
+      "integrity": "sha512-YZ3GUyn/o8gfKJlnlX7g7xq4gyO6OSuhGPKaaGssGB2qgDUS0gPgtTvoyZLTt9Ab6dC4hfc9dV5arkvc/OCmrw==",
+      "engines": {
+        "node": ">= 0.6"
+      }
+    },
+    "node_modules/cookie-signature": {
+      "version": "1.0.6",
+      "resolved": "https://registry.npmjs.org/cookie-signature/-/cookie-signature-1.0.6.tgz",
+      "integrity": "sha512-QADzlaHc8icV8I7vbaJXJwod9HWYp8uCqf1xa4OfNu1T7JVxQIrUgOWtHdNDtPiywmFbiS12VjotIXLrKM3orQ=="
+    },
     "node_modules/create-require": {
       "version": "1.1.1",
       "resolved": "https://registry.npmjs.org/create-require/-/create-require-1.1.1.tgz",
@@ -2202,6 +2385,23 @@
         "node": ">=0.4.0"
       }
     },
+    "node_modules/depd": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/depd/-/depd-2.0.0.tgz",
+      "integrity": "sha512-g7nH6P6dyDioJogAAGprGpCtVImJhpPk/roCzdb3fIh61/s/nPsfR6onyMwkCAR/OlC3yBC0lESvUoQEAssIrw==",
+      "engines": {
+        "node": ">= 0.8"
+      }
+    },
+    "node_modules/destroy": {
+      "version": "1.2.0",
+      "resolved": "https://registry.npmjs.org/destroy/-/destroy-1.2.0.tgz",
+      "integrity": "sha512-2sJGJTaXIIaR1w4iJSNoN0hnMY7Gpc/n8D4qSCJw8QqFWXf7cuAgnEHxBpweaVcPevC2l3KpjYCx3NypQQgaJg==",
+      "engines": {
+        "node": ">= 0.8",
+        "npm": "1.2.8000 || >= 1.4.16"
+      }
+    },
     "node_modules/detect-newline": {
       "version": "3.1.0",
       "resolved": "https://registry.npmjs.org/detect-newline/-/detect-newline-3.1.0.tgz",
@@ -2253,6 +2453,11 @@
         "node": ">=6.0.0"
       }
     },
+    "node_modules/ee-first": {
+      "version": "1.1.1",
+      "resolved": "https://registry.npmjs.org/ee-first/-/ee-first-1.1.1.tgz",
+      "integrity": "sha512-WMwm9LhRUo+WUaRN+vRuETqG89IgZphVSNkdFgeb6sS/E4OrDIN7t48CAewSHXc6C8lefD8KKfr5vY61brQlow=="
+    },
     "node_modules/electron-to-chromium": {
       "version": "1.4.284",
       "resolved": "https://registry.npmjs.org/electron-to-chromium/-/electron-to-chromium-1.4.284.tgz",
@@ -2282,6 +2487,14 @@
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     },
+    "node_modules/encodeurl": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/encodeurl/-/encodeurl-1.0.2.tgz",
+      "integrity": "sha512-TPJXq8JqFaVYm2CWmPvnP2Iyo4ZSM7/QKcSmuMLDObfpH5fi7RUGmd/rTDf+rut/saiDiQEeVTNgAmJEdAOx0w==",
+      "engines": {
+        "node": ">= 0.8"
+      }
+    },
     "node_modules/error-ex": {
       "version": "1.3.2",
       "resolved": "https://registry.npmjs.org/error-ex/-/error-ex-1.3.2.tgz",
@@ -2306,6 +2519,11 @@
         "node": ">=6"
       }
     },
+    "node_modules/escape-html": {
+      "version": "1.0.3",
+      "resolved": "https://registry.npmjs.org/escape-html/-/escape-html-1.0.3.tgz",
+      "integrity": "sha512-NiSupZ4OeuGwr68lGIeym/ksIZMJodUGOSCZ/FSnTxcrekbvqrgdUxlJOMpijaKZVjAJrWrGs/6Jy8OMuyj9ow=="
+    },
     "node_modules/escape-string-regexp": {
       "version": "4.0.0",
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@@ -2535,6 +2753,14 @@
         "node": ">=0.10.0"
       }
     },
+    "node_modules/etag": {
+      "version": "1.8.1",
+      "resolved": "https://registry.npmjs.org/etag/-/etag-1.8.1.tgz",
+      "integrity": "sha512-aIL5Fx7mawVa300al2BnEE4iNvo1qETxLrPI/o05L7z6go7fCw1J6EQmbK4FmJ2AS7kgVF/KEZWufBfdClMcPg==",
+      "engines": {
+        "node": ">= 0.6"
+      }
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@@ -2583,6 +2809,60 @@
         "node": "^14.15.0 || ^16.10.0 || >=18.0.0"
       }
     },
+    "node_modules/express": {
+      "version": "4.18.2",
+      "resolved": "https://registry.npmjs.org/express/-/express-4.18.2.tgz",
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+      "dependencies": {
+        "accepts": "~1.3.8",
+        "array-flatten": "1.1.1",
+        "body-parser": "1.20.1",
+        "content-disposition": "0.5.4",
+        "content-type": "~1.0.4",
+        "cookie": "0.5.0",
+        "cookie-signature": "1.0.6",
+        "debug": "2.6.9",
+        "depd": "2.0.0",
+        "encodeurl": "~1.0.2",
+        "escape-html": "~1.0.3",
+        "etag": "~1.8.1",
+        "finalhandler": "1.2.0",
+        "fresh": "0.5.2",
+        "http-errors": "2.0.0",
+        "merge-descriptors": "1.0.1",
+        "methods": "~1.1.2",
+        "on-finished": "2.4.1",
+        "parseurl": "~1.3.3",
+        "path-to-regexp": "0.1.7",
+        "proxy-addr": "~2.0.7",
+        "qs": "6.11.0",
+        "range-parser": "~1.2.1",
+        "safe-buffer": "5.2.1",
+        "send": "0.18.0",
+        "serve-static": "1.15.0",
+        "setprototypeof": "1.2.0",
+        "statuses": "2.0.1",
+        "type-is": "~1.6.18",
+        "utils-merge": "1.0.1",
+        "vary": "~1.1.2"
+      },
+      "engines": {
+        "node": ">= 0.10.0"
+      }
+    },
+    "node_modules/express/node_modules/debug": {
+      "version": "2.6.9",
+      "resolved": "https://registry.npmjs.org/debug/-/debug-2.6.9.tgz",
+      "integrity": "sha512-bC7ElrdJaJnPbAP+1EotYvqZsb3ecl5wi6Bfi6BJTUcNowp6cvspg0jXznRTKDjm/E7AdgFBVeAPVMNcKGsHMA==",
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+      "resolved": "https://registry.npmjs.org/qs/-/qs-6.11.0.tgz",
+      "integrity": "sha512-MvjoMCJwEarSbUYk5O+nmoSzSutSsTwF85zcHPQ9OrlFoZOYIjaqBAJIqIXjptyD5vThxGq52Xu/MaJzRkIk4Q==",
+      "requires": {
+        "side-channel": "^1.0.4"
+      }
+    },
     "queue-microtask": {
       "version": "1.2.3",
       "resolved": "https://registry.npmjs.org/queue-microtask/-/queue-microtask-1.2.3.tgz",
       "integrity": "sha512-NuaNSa6flKT5JaSYQzJok04JzTL1CA6aGhv5rfLW3PgqA+M2ChpZQnAC8h8i4ZFkBS8X5RqkDBHA7r4hej3K9A==",
       "dev": true
     },
+    "range-parser": {
+      "version": "1.2.1",
+      "resolved": "https://registry.npmjs.org/range-parser/-/range-parser-1.2.1.tgz",
+      "integrity": "sha512-Hrgsx+orqoygnmhFbKaHE6c296J+HTAQXoxEF6gNupROmmGJRoyzfG3ccAveqCBrwr/2yxQ5BVd/GTl5agOwSg=="
+    },
+    "raw-body": {
+      "version": "2.5.1",
+      "resolved": "https://registry.npmjs.org/raw-body/-/raw-body-2.5.1.tgz",
+      "integrity": "sha512-qqJBtEyVgS0ZmPGdCFPWJ3FreoqvG4MVQln/kCgF7Olq95IbOp0/BWyMwbdtn4VTvkM8Y7khCQ2Xgk/tcrCXig==",
+      "requires": {
+        "bytes": "3.1.2",
+        "http-errors": "2.0.0",
+        "iconv-lite": "0.4.24",
+        "unpipe": "1.0.0"
+      }
+    },
     "react-is": {
       "version": "18.2.0",
       "resolved": "https://registry.npmjs.org/react-is/-/react-is-18.2.0.tgz",
@@ -8677,6 +9737,11 @@
       "resolved": "https://registry.npmjs.org/safe-stable-stringify/-/safe-stable-stringify-2.4.2.tgz",
       "integrity": "sha512-gMxvPJYhP0O9n2pvcfYfIuYgbledAOJFcqRThtPRmjscaipiwcwPPKLytpVzMkG2HAN87Qmo2d4PtGiri1dSLA=="
     },
+    "safer-buffer": {
+      "version": "2.1.2",
+      "resolved": "https://registry.npmjs.org/safer-buffer/-/safer-buffer-2.1.2.tgz",
+      "integrity": "sha512-YZo3K82SD7Riyi0E1EQPojLz7kpepnSQI9IyPbHHg1XXXevb5dJI7tpyN2ADxGcQbHG7vcyRHk0cbwqcQriUtg=="
+    },
     "semver": {
       "version": "7.3.8",
       "resolved": "https://registry.npmjs.org/semver/-/semver-7.3.8.tgz",
@@ -8686,6 +9751,64 @@
         "lru-cache": "^6.0.0"
       }
     },
+    "send": {
+      "version": "0.18.0",
+      "resolved": "https://registry.npmjs.org/send/-/send-0.18.0.tgz",
+      "integrity": "sha512-qqWzuOjSFOuqPjFe4NOsMLafToQQwBSOEpS+FwEt3A2V3vKubTquT3vmLTQpFgMXp8AlFWFuP1qKaJZOtPpVXg==",
+      "requires": {
+        "debug": "2.6.9",
+        "depd": "2.0.0",
+        "destroy": "1.2.0",
+        "encodeurl": "~1.0.2",
+        "escape-html": "~1.0.3",
+        "etag": "~1.8.1",
+        "fresh": "0.5.2",
+        "http-errors": "2.0.0",
+        "mime": "1.6.0",
+        "ms": "2.1.3",
+        "on-finished": "2.4.1",
+        "range-parser": "~1.2.1",
+        "statuses": "2.0.1"
+      },
+      "dependencies": {
+        "debug": {
+          "version": "2.6.9",
+          "resolved": "https://registry.npmjs.org/debug/-/debug-2.6.9.tgz",
+          "integrity": "sha512-bC7ElrdJaJnPbAP+1EotYvqZsb3ecl5wi6Bfi6BJTUcNowp6cvspg0jXznRTKDjm/E7AdgFBVeAPVMNcKGsHMA==",
+          "requires": {
+            "ms": "2.0.0"
+          },
+          "dependencies": {
+            "ms": {
+              "version": "2.0.0",
+              "resolved": "https://registry.npmjs.org/ms/-/ms-2.0.0.tgz",
+              "integrity": "sha512-Tpp60P6IUJDTuOq/5Z8cdskzJujfwqfOTkrwIwj7IRISpnkJnT6SyJ4PCPnGMoFjC9ddhal5KVIYtAt97ix05A=="
+            }
+          }
+        },
+        "ms": {
+          "version": "2.1.3",
+          "resolved": "https://registry.npmjs.org/ms/-/ms-2.1.3.tgz",
+          "integrity": "sha512-6FlzubTLZG3J2a/NVCAleEhjzq5oxgHyaCU9yYXvcLsvoVaHJq/s5xXI6/XXP6tz7R9xAOtHnSO/tXtF3WRTlA=="
+        }
+      }
+    },
+    "serve-static": {
+      "version": "1.15.0",
+      "resolved": "https://registry.npmjs.org/serve-static/-/serve-static-1.15.0.tgz",
+      "integrity": "sha512-XGuRDNjXUijsUL0vl6nSD7cwURuzEgglbOaFuZM9g3kwDXOWVTck0jLzjPzGD+TazWbboZYu52/9/XPdUgne9g==",
+      "requires": {
+        "encodeurl": "~1.0.2",
+        "escape-html": "~1.0.3",
+        "parseurl": "~1.3.3",
+        "send": "0.18.0"
+      }
+    },
+    "setprototypeof": {
+      "version": "1.2.0",
+      "resolved": "https://registry.npmjs.org/setprototypeof/-/setprototypeof-1.2.0.tgz",
+      "integrity": "sha512-E5LDX7Wrp85Kil5bhZv46j8jOeboKq5JMmYM3gVGdGH8xFpPWXUMsNrlODCrkoxMEeNi/XZIwuRvY4XNwYMJpw=="
+    },
     "shebang-command": {
       "version": "2.0.0",
       "resolved": "https://registry.npmjs.org/shebang-command/-/shebang-command-2.0.0.tgz",
@@ -8701,6 +9824,16 @@
       "integrity": "sha512-7++dFhtcx3353uBaq8DDR4NuxBetBzC7ZQOhmTQInHEd6bSrXdiEyzCvG07Z44UYdLShWUyXt5M/yhz8ekcb1A==",
       "dev": true
     },
+    "side-channel": {
+      "version": "1.0.4",
+      "resolved": "https://registry.npmjs.org/side-channel/-/side-channel-1.0.4.tgz",
+      "integrity": "sha512-q5XPytqFEIKHkGdiMIrY10mvLRvnQh42/+GoBlFW3b2LXLE2xxJpZFdm94we0BaoV3RwJyGqg5wS7epxTv0Zvw==",
+      "requires": {
+        "call-bind": "^1.0.0",
+        "get-intrinsic": "^1.0.2",
+        "object-inspect": "^1.9.0"
+      }
+    },
     "signal-exit": {
       "version": "3.0.7",
       "resolved": "https://registry.npmjs.org/signal-exit/-/signal-exit-3.0.7.tgz",
@@ -8771,6 +9904,11 @@
         }
       }
     },
+    "statuses": {
+      "version": "2.0.1",
+      "resolved": "https://registry.npmjs.org/statuses/-/statuses-2.0.1.tgz",
+      "integrity": "sha512-RwNA9Z/7PrK06rYLIzFMlaF+l73iwpzsqRIFgbMLbTcLD6cOao82TaWefPXQvB2fOC4AjuYSEndS7N/mTCbkdQ=="
+    },
     "string_decoder": {
       "version": "1.3.0",
       "resolved": "https://registry.npmjs.org/string_decoder/-/string_decoder-1.3.0.tgz",
@@ -8842,6 +9980,14 @@
       "integrity": "sha512-ot0WnXS9fgdkgIcePe6RHNk1WA8+muPa6cSjeR3V8K27q9BB1rTE3R1p7Hv0z1ZyAc8s6Vvv8DIyWf681MAt0w==",
       "dev": true
     },
+    "tdigest": {
+      "version": "0.1.2",
+      "resolved": "https://registry.npmjs.org/tdigest/-/tdigest-0.1.2.tgz",
+      "integrity": "sha512-+G0LLgjjo9BZX2MfdvPfH+MKLCrxlXSYec5DaPYP1fe6Iyhf0/fSmJ0bFiZ1F8BT6cGXl2LpltQptzjXKWEkKA==",
+      "requires": {
+        "bintrees": "1.0.2"
+      }
+    },
     "test-exclude": {
       "version": "6.0.0",
       "resolved": "https://registry.npmjs.org/test-exclude/-/test-exclude-6.0.0.tgz",
@@ -8885,6 +10031,11 @@
         "is-number": "^7.0.0"
       }
     },
+    "toidentifier": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/toidentifier/-/toidentifier-1.0.1.tgz",
+      "integrity": "sha512-o5sSPKEkg/DIQNmH43V0/uerLrpzVedkUh8tGNvaeXpfpuwjKenlSox/2O/BTlZUtEe+JG7s5YhEz608PlAHRA=="
+    },
     "triple-beam": {
       "version": "1.3.0",
       "resolved": "https://registry.npmjs.org/triple-beam/-/triple-beam-1.3.0.tgz",
@@ -8963,12 +10114,26 @@
       "integrity": "sha512-Ne+eE4r0/iWnpAxD852z3A+N0Bt5RN//NjJwRd2VFHEmrywxf5vsZlh4R6lixl6B+wz/8d+maTSAkN1FIkI3LQ==",
       "dev": true
     },
+    "type-is": {
+      "version": "1.6.18",
+      "resolved": "https://registry.npmjs.org/type-is/-/type-is-1.6.18.tgz",
+      "integrity": "sha512-TkRKr9sUTxEH8MdfuCSP7VizJyzRNMjj2J2do2Jr3Kym598JVdEksuzPQCnlFPW4ky9Q+iA+ma9BGm06XQBy8g==",
+      "requires": {
+        "media-typer": "0.3.0",
+        "mime-types": "~2.1.24"
+      }
+    },
     "typescript": {
       "version": "4.9.4",
       "resolved": "https://registry.npmjs.org/typescript/-/typescript-4.9.4.tgz",
       "integrity": "sha512-Uz+dTXYzxXXbsFpM86Wh3dKCxrQqUcVMxwU54orwlJjOpO3ao8L7j5lH+dWfTwgCwIuM9GQ2kvVotzYJMXTBZg==",
       "dev": true
     },
+    "unpipe": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/unpipe/-/unpipe-1.0.0.tgz",
+      "integrity": "sha512-pjy2bYhSsufwWlKwPc+l3cN7+wuJlK6uz0YdJEOlQDbl6jo/YlPi4mb8agUkVC8BF7V8NuzeyPNqRksA3hztKQ=="
+    },
     "update-browserslist-db": {
       "version": "1.0.10",
       "resolved": "https://registry.npmjs.org/update-browserslist-db/-/update-browserslist-db-1.0.10.tgz",
@@ -8993,6 +10158,11 @@
       "resolved": "https://registry.npmjs.org/util-deprecate/-/util-deprecate-1.0.2.tgz",
       "integrity": "sha512-EPD5q1uXyFxJpCrLnCc1nHnq3gOa6DZBocAIiI2TaSCA7VCJ1UJDMagCzIkXNsUYfD1daK//LTEQ8xiIbrHtcw=="
     },
+    "utils-merge": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/utils-merge/-/utils-merge-1.0.1.tgz",
+      "integrity": "sha512-pMZTvIkT1d+TFGvDOqodOclx0QWkkgi6Tdoa8gC8ffGAAqz9pzPTZWAybbsHHoED/ztMtkv/VoYTYyShUn81hA=="
+    },
     "uuid": {
       "version": "8.3.2",
       "resolved": "https://registry.npmjs.org/uuid/-/uuid-8.3.2.tgz",
@@ -9033,6 +10203,11 @@
         }
       }
     },
+    "vary": {
+      "version": "1.1.2",
+      "resolved": "https://registry.npmjs.org/vary/-/vary-1.1.2.tgz",
+      "integrity": "sha512-BNGbWLfd0eUPabhkXUVm0j8uuvREyTh5ovRa/dyow/BqAbZJyC+5fU+IzQOzmAKzYqYRAISoRhdQr3eIZ/PXqg=="
+    },
     "walker": {
       "version": "1.0.8",
       "resolved": "https://registry.npmjs.org/walker/-/walker-1.0.8.tgz",
diff --git a/package.json b/package.json
index 810419c..6105810 100644
--- a/package.json
+++ b/package.json
@@ -37,11 +37,14 @@
   "dependencies": {
     "axios": "^1.2.2",
     "axios-mock-adapter": "^1.21.2",
+    "express": "4.18.2",
     "node-cron": "3.0.2",
+    "prom-client": "14.2.0",
     "winston": "^3.8.2"
   },
   "devDependencies": {
     "@tsconfig/node18": "^1.0.1",
+    "@types/express": "4.17.17",
     "@types/jest": "^29.2.4",
     "@types/node": "^18.11.18",
     "@types/node-cron": "^3.0.7",
diff --git a/src/index.ts b/src/index.ts
index 37117aa..eea9ecf 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -15,6 +15,10 @@ import {AuthTicket, Connection, GlucoseItem} from "./interfaces/librelink/common
 import {getUtcDateFromString, mapTrendArrow} from "./helpers/helpers";
 import {LibreLinkUpHttpHeaders, NightScoutHttpHeaders} from "./interfaces/http-headers";
 import {Entry} from "./interfaces/nightscout/entry";
+import {prometheusEndpointInit, prometheusExport} from "./prometheus/exporter";
+
+const ENABLE_PROMETHEUS = !!process.env.PROMETHEUS_PORT;
+const ENABLE_NIGHTSCOUT = !!process.env.NIGHTSCOUT_API_TOKEN;
 
 const {combine, timestamp, printf} = format;
 
@@ -113,6 +117,9 @@ const nightScoutHttpHeaders: NightScoutHttpHeaders = {
     "Content-Type": "application/json",
 }
 
+logger.debug(`Nightscout is ${ENABLE_NIGHTSCOUT ? 'enabled' : 'disabled'}`);
+logger.debug(`Prometheus is ${ENABLE_PROMETHEUS ? 'enabled' : 'disabled'}`);
+
 if (process.env.SINGLE_SHOT === "true")
 {
     main().then();
@@ -125,6 +132,16 @@ else
     {
         main().then()
     }, {});
+
+    if (ENABLE_PROMETHEUS) {
+        // get a value as soon as possible to avoid exporting zeroes
+        main().then();
+        prometheusEndpointInit({
+            port: parseInt(process.env.PROMETHEUS_PORT || "8080"),
+            logger,
+            endpoint: '/metrics',
+        });
+    }
 }
 
 async function main(): Promise<void>
@@ -149,7 +166,13 @@ async function main(): Promise<void>
         return;
     }
 
-    await uploadToNightScout(glucoseGraphData);
+    if (ENABLE_PROMETHEUS) {
+        await prometheusExport(glucoseGraphData);
+    }
+
+    if (ENABLE_NIGHTSCOUT) {
+        await uploadToNightScout(glucoseGraphData);
+    }
 }
 
 export async function login(): Promise<AuthTicket | null>
diff --git a/src/prometheus/exporter.ts b/src/prometheus/exporter.ts
new file mode 100644
index 0000000..cc811d5
--- /dev/null
+++ b/src/prometheus/exporter.ts
@@ -0,0 +1,65 @@
+
+import {writeFile} from "node:fs/promises";
+import {tmpdir} from "node:os";
+import {GraphData} from "../interfaces/librelink/graph-response";
+import {getUtcDateFromString} from "../helpers/helpers";
+import type {Logger} from "winston";
+
+import express from 'express';
+import type { Request, Response } from "express";
+import { register, Gauge } from 'prom-client';
+import { GlucoseMeasurement } from "../interfaces/librelink/common";
+
+const exampleJson = `${tmpdir()}/librelink-example.json`;
+
+const glucoseValue = new Gauge({ name: 'glucose_value', help: 'current value mmol/L' });
+const glucoseTrend = new Gauge({ name: 'glucose_trend', help: 'trend arrow value as reported by librelink up' });
+const glucoseHigh =  new Gauge({ name: 'glucose_high',  help: 'glucose high 1.0=true 0.0=false' });
+const glucoseLow =   new Gauge({ name: 'glucose_low',   help: 'glucose high 1.0=true 0.0=false' });
+
+let exporting = false;
+
+export interface PrometheusExportServerOptions {
+    port: number,
+    logger: Logger,
+    endpoint: string,
+}
+
+export async function prometheusEndpointInit(options: PrometheusExportServerOptions) {
+    const server = express();
+    server.get(options.endpoint, async (req: Request, res: Response) => {
+        try {
+            res.set('Content-Type', register.contentType);
+            res.end(await register.metrics());
+        } catch (ex) {
+            res.status(500).end(ex);
+        }
+    });
+    server.get('/', async (req: Request, res: Response) => {
+        res.setHeader('content-type', 'text/plain');
+        res.send(`Online, see ${options.endpoint}\n`);
+    });
+
+    exporting = true;
+    options.logger.info(`Prometheus export at :${options.port}${options.endpoint}`);
+    server.listen(options.port);
+}
+
+export async function prometheusExport(measurementData: GraphData): Promise<void>
+{
+    const current = measurementData.connection.glucoseMeasurement;
+    if (!exporting) {
+        console.log('Example measurement', getUtcDateFromString(current.FactoryTimestamp), current);
+        await writeFile(exampleJson, JSON.stringify(measurementData), 'utf8');
+        console.warn('Prometheus exporter not initialized; response written to', exampleJson);
+        return;
+    }
+    exportCurrent(current);
+}
+
+function exportCurrent(measurement: GlucoseMeasurement) {
+    glucoseValue.set(measurement.Value);
+    glucoseTrend.set(measurement.TrendArrow);
+    glucoseHigh.set(measurement.isHigh ? 1 : 0);
+    glucoseLow.set(measurement.isLow ? 1 : 0);
+}